CN107462504B - Online self-correcting air particulate matter detection device and self-correcting and state self-diagnosing method thereof - Google Patents
Online self-correcting air particulate matter detection device and self-correcting and state self-diagnosing method thereof Download PDFInfo
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- 238000001514 detection method Methods 0.000 title claims abstract description 167
- 239000013618 particulate matter Substances 0.000 title claims abstract description 128
- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000004092 self-diagnosis Methods 0.000 claims description 32
- 230000003287 optical effect Effects 0.000 claims description 23
- 238000005259 measurement Methods 0.000 claims description 22
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- 238000012545 processing Methods 0.000 claims description 6
- 238000003745 diagnosis Methods 0.000 claims description 5
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/06—Investigating concentration of particle suspensions
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- G01N15/075—
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/06—Investigating concentration of particle suspensions
- G01N2015/0662—Comparing before/after passage through filter
Abstract
The invention relates to an on-line self-correcting air particulate matter detection device and a self-correcting and state self-diagnosing method thereof, which comprises a gear automatic switching device, an air path switching device and a control device which are connected with a particulate matter concentration detection device; the control device controls the gear automatic switching device and the air channel switching device to switch gears and air channels, so that the particulate matter concentration detection device is in different working modes; the automatic gear switching device is arranged in the device shell and comprises a knob, a mechanical device linked with the knob, a supporting device for supporting the mechanical device, a power device for providing power for the mechanical device and a position detection device for detecting the position of the knob; one end of the knob is connected with a standard light-transmitting template in the particulate matter concentration detection device, and the other end of the knob is connected with the mechanical device; the gas circuit switching device is connected with a gas circuit inlet in the particulate matter concentration detection device. The invention can be widely applied to the field of air particulate matter detection.
Description
Technical Field
The invention relates to an air particulate matter detection device and method, in particular to an on-line self-correcting air particulate matter detection device and a self-correcting and state self-diagnosing method thereof.
Background
With the rapid promotion of national economy development and urbanization and industrialization in China, particulate matter pollution has become an important concern in all aspects of the whole society. China signed Paris climate agreement in 2015, and increases environmental monitoring and renovation. The explicit goals of environmental regulations are also gradually refined everywhere. Among them is the monitoring of air particulate matter.
The air particulate matter detection device also undergoes the processes of long-term continuous monitoring from spot inspection, single-point detection of grid layout, simple data inspection and big data analysis. In the process, new requirements are put forward on the remote automatic function and reliability of the air particulate matter detection device, the accuracy of measurement data, easy maintenance and the like.
On the one hand, as most of the air particle detection devices are continuously monitored outdoors, different use environments, climate change and system time drift can have certain influence on the parts of the air particle detection devices, such as air paths, light paths, circuits and the like. On the other hand, due to the gridding application of air particulate matter monitoring, the air particulate matter detection device is gradually spread over urban and rural areas, and is large in quantity, long in distance, inconvenient in manual maintenance and high in cost.
Disclosure of Invention
Aiming at the problems, the invention aims to provide an on-line self-calibration air particulate matter detection device and a self-calibration and state self-diagnosis method thereof.
In order to achieve the above purpose, the present invention adopts the following technical scheme: the utility model provides an on-line self-correcting air particulate matter detection device, includes particulate matter concentration detection device, its characterized in that: the device comprises a gear automatic switching device, an air path switching device and a control device which are connected with the particulate matter concentration detection device; the control device sends a control signal to the gear automatic switching device and the air path switching device according to a local or remote control instruction, and the gear automatic switching device and the air path switching device switch gears and air paths according to the received control signal so that the particulate matter concentration detection device is in different working modes; the automatic gear switching device is arranged in a device shell and comprises a knob, a mechanical device, a supporting device, a power device and a position detection device, wherein the mechanical device is in linkage with the knob; one end of the knob is connected with a standard light-transmitting template in the particulate matter concentration detection device, and the other end of the knob is connected with the mechanical device; the gas circuit switching device is connected with a gas circuit inlet in the particulate matter concentration detection device.
The mechanical device comprises a coupler, a guide shaft, a screw rod and a locating pin which are sequentially connected, the other end of the coupler is connected with the knob, the guide shaft is provided with the locating pin which is used for enabling the guide shaft to be in linkage with the screw rod, and the other end of the screw rod is installed in the supporting device.
The supporting device comprises a supporting seat, a bearing and a bearing cover, wherein a round hole for the screw rod to penetrate out is formed in the supporting seat, and the other end of the screw rod is installed on the bearing after the screw rod penetrates out of the supporting seat and is fixed by the bearing cover.
The power device comprises a motor and two transmission mechanisms, wherein the motor is fixedly arranged on the device shell and the supporting seat and is controlled by the control device; the output end of the motor is connected with the two transmission mechanisms, and the transmission mechanisms drive the screw rods to act; the position detection device comprises a position sensing element and a position sensor, wherein the position sensing element is arranged on the coupler and is used for sending a position signal to the position sensor according to the position of the knob, and the position sensor is used for sending the received position signal to the control device.
The control device comprises a control board arranged on the device shell, wherein a control module is arranged in the control board and comprises an automatic control module, a local control module, a remote control module, a self-calibration module and a self-diagnosis module; the automatic control module is used for carrying out initialization setting and power-on self-correction on the particulate matter concentration detection device when the particulate matter concentration detection device is started up, and controlling the particulate matter concentration detection device to enter a measurement state; the remote control module is used for receiving a remote instruction sent by the upper computer, sending the remote instruction to the local control module and uploading feedback information of the local control module to the upper computer; the local control module is used for receiving a local or remote control instruction, converting the local or remote control instruction into a control signal, transmitting the control signal to the self-calibration module or the self-calibration module, and receiving returned self-diagnosis information of zero calibration, calibration or state; the self-zeroing module is used for carrying out zero calibration on the measured value of the particulate matter concentration detection device according to the received self-zeroing control signal and sending the self-zeroing result to the local control module; the self-calibration module is used for calibrating the measured value of the particulate matter concentration detection device according to the received self-calibration control signal and sending the self-calibration result to the local control module; the self-diagnosis module is used for carrying out state self-diagnosis on the particulate matter concentration detection device according to the self-calibration result or the self-calibration result in the local control module and returning state information to the local control module.
The automatic control module comprises an initialization control module and a starting self-correction module; the initialization control module is used for initializing the particulate matter concentration detection device when the particulate matter concentration detection device is started; the starting self-calibration module is used for sequentially sending control signals to the self-calibration module and the self-calibration module to finish power-on self-calibration, and controlling the particulate matter concentration detection device to enter a measurement state according to the state information collected by the self-diagnosis module; the local control module comprises a timing self-calibration module, a remote control instruction processing module and a data storage module; the timing self-zeroing control module is used for periodically sending a self-zeroing control signal to the self-zeroing module according to a preset self-zeroing period; the timing self-calibration control module is used for periodically sending self-calibration control signals to the self-calibration module according to a preset self-calibration period; the remote control instruction processing module is used for receiving the remote instruction of the upper computer sent by the remote control module, converting the remote instruction of the upper computer into a control signal and sending the control signal to the self-calibration module or the self-calibration module; the data storage module is used for receiving and storing zero calibration, calibration and state diagnosis information returned by the self-calibration module, the self-calibration module or the self-diagnosis module.
A self-calibration and state self-diagnosis method of an on-line self-calibration air particulate matter detection device is characterized by comprising the following steps: 1) After the detection device is started, the automatic control module performs initialization setting and power-on self-correction on the detection device and the particulate matter concentration detection device, and then controls the particulate matter concentration detection device to enter a measurement state; 2) The local or upper computer sends a control instruction to the local control module or the remote control module through the control panel, and the local control module converts the received control instruction into a corresponding control signal and sends the corresponding control signal to the self-calibration module or the self-calibration module; 3) After receiving the self-calibration control signal, the self-calibration module enters a corresponding self-calibration mode, sends the control signal to the gear automatic switching device and the particulate matter concentration detection device, calibrates the measured value of the particulate matter concentration detection device, and sends the calibration result to the local control module; 4) After receiving the self-zeroing control signal, the self-zeroing module enters a corresponding self-zeroing mode, sends the control signal to the air inlet valve and the particulate concentration detection device, performs zero calibration on the measured value of the particulate concentration detection device, and returns a zeroing result to the local control module; 5) The self-diagnosis module judges the state of the particulate matter concentration detection device according to the self-calibration and self-calibration measurement results in the local control module, and returns corresponding state information.
In the step 3), the method for calibrating the measured value of the particulate matter concentration detection device by the self-calibration module comprises the following steps: (1) the self-calibration module sends a control signal to the motor to enable the motor to rotate forward, and the screw rod is driven to rotate forward through the transmission mechanism; (2) the screw drives the guide shaft to move through the locating pin, and then the knob is rotated through the coupler to push the knob to a calibration position, and the standard light-transmitting template is positioned in the light path; (3) the position sensing element sends a position signal to the position sensor, and the position sensor sends the position signal of the knob to the control panel; (4) when the control board receives a position signal sent by the position sensor, the motor is controlled to stop moving, and the knob is kept at a calibration position; (5) the optical detection unit starts to measure, and after a plurality of measuring periods, the measured value is adjusted to be a calibration value and stored; (6) the automatic calibration module controls the motor to rotate reversely, so that the transmission mechanism drives the screw rod to rotate reversely, the screw rod drives the guide shaft to move through the locating pin, the knob rotates and is pushed to the measuring position, and the self-calibration process is finished.
In the step 4), the method for performing zero calibration of the measured value of the detection device by the self-zeroing module comprises the following steps: (1) the self-zeroing module sends a control signal to the air inlet valve to cut off a passage between an internal air passage of the particulate concentration detection device and external air, so that a closed air passage is formed inside the particulate concentration detection device; (2) the self-zeroing module sends a control signal to the particulate matter concentration detection device to start the air pump, the air enters the optical detection unit after being filtered by the internal filtering unit, so that the internal air of the particulate matter concentration detection device is continuously and circularly filtered in the closed air path until the particulate matter concentration of the internal air measured by the optical detection unit is not changed any more, and the measured value at the moment is recorded; (3) the self-zeroing module sends a control signal to the air inlet valve, so that an internal air circuit of the particulate matter concentration detection device is communicated with external air, and the self-zeroing process is finished; (4) repeating the steps (1) - (3) for several times, averaging the obtained measured values to obtain an average value, and storing the average value as a basic noise value of the particulate matter concentration detection device, thereby completing the self-zeroing process.
In the step 5), the method for judging the state of the particulate matter concentration detection device by the self-diagnosis module comprises the following steps: if the measured value returned after calibration is within the allowable error range of the calibration value and the zero value after zero calibration is lower than the previous zero calibration value, judging that the system state is zero drift; if the absolute value of the relative error value between the measured value and the calibration value after the calibration is more than 10%, judging that the internal device of the optical detection unit is damaged, and prompting maintenance; if the two items are normal, the operation period reaches the life period of the sampling power system, and maintenance is prompted.
Due to the adoption of the technical scheme, the invention has the following advantages: 1. the invention is provided with the gear automatic switching device and the air path switching device, and can automatically switch the working mode of the particulate matter concentration detection device according to the requirements, thereby realizing different functions of measurement and self-calibration. 2. The control device is provided with the self-zeroing module, the self-calibrating module and the self-diagnosis module, so that the self-zeroing, self-calibrating or state self-diagnosis function of the particulate matter concentration detection device can be realized according to the external environment. 3. The remote control module is arranged in the control device, can receive a remote control instruction, realizes functions of remote state self-diagnosis, fault judgment and the like of the particulate matter concentration detection device, and effectively reduces the manual maintenance cost of the air particulate matter concentration detection device with large quantity and long distance. Therefore, the invention can be widely applied to the field of air particulate matter detection.
Drawings
FIG. 1 is a schematic diagram of an on-line self-calibrating air particulate matter detection device of the present invention;
in the figure, 1, a knob; 2. a coupling; 3. a guide shaft; 4. a screw; 5. a support base; 6. a bearing; 7. a bearing cap; 8. a transmission mechanism; 9. a motor; 10. a positioning pin; 11. a position sensing element; 12. a control board; 13. a control board; 14. a connection terminal; 15. a front side housing; 16. a rear side housing; 17. an end housing; 18. an intake valve; 19. a sampler; 20. a particulate matter concentration detection device; 21. a standard light-transmitting template; 22. a screw; 23. an optical detection unit; 24. an air pump; 25. an internal filter unit; 26. a position sensor.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and examples.
As shown in fig. 1, the on-line self-calibration air particulate matter detection device provided by the invention comprises a gear automatic switching device, an air path switching device and a control device, wherein the gear automatic switching device, the air path switching device and the control device are connected with the existing particulate matter concentration detection device 20, the control device sends control signals to the gear automatic switching device and the air path switching device according to local or remote control instructions, and the gear automatic switching device and the air path switching device perform gear switching and air path switching according to the received control signals, so that the particulate matter concentration detection device 20 is in different working modes. The particulate matter concentration detection device 20, the gear automatic switching device and the control device are all arranged in the device shell and are connected with an external power line, a control line or a signal line through the connecting terminal 14, and the gas circuit switching device is arranged outside the device shell and is connected with a gas circuit inlet of the particulate matter concentration detection device 20.
The automatic gear switching device comprises a knob 1, a mechanical device linked with the knob 1, a supporting device for supporting the mechanical device, a power device for providing power for the mechanical device and a position detection device for detecting the position of the knob. One end of the knob 1 is connected with the particulate matter concentration detection device 20, and the other end is connected with a mechanical device. The mechanical device comprises a coupler 2, a guide shaft 3 and a screw 4 which are sequentially connected, the other end of the coupler 2 is connected with a knob 1, a positioning pin 10 for enabling the guide shaft 3 to be in linkage with the screw 4 is arranged on the guide shaft 3, and the other end of the screw 4 is arranged in the supporting device. The supporting device comprises a supporting seat 5, a bearing 6 and a bearing cover 7, a round hole for the screw 4 to penetrate is formed in the supporting seat 5, and the other end of the screw 4 is installed on the bearing 6 after penetrating out of the supporting seat 5 and is fixed by the bearing cover 7. The power device comprises a motor 9 and two transmission mechanisms 8, wherein the motor 9 is fixedly arranged on the device shell and the supporting seat 5 through screws 22 and is controlled by the control device; the output end of the motor 9 is connected with two transmission mechanisms 8, and the transmission mechanisms 8 drive the screw 4 to act. The position detecting means comprises a position sensing element 11 and a position sensor 26, the position sensing element 11 being arranged on the coupling 2 for transmitting a position signal to the position sensor 26 in dependence of the position of the knob 1, the position sensor 26 transmitting the received position signal to the control means.
The particulate matter concentration detection device 20 includes a sampler 19 connected to the gas path switching device, i.e., the intake valve 18, for cutting particulate matter concentrations of different particle size distributions, an optical detection unit 23 for detecting the particulate matter concentration in the gas to be detected, an air pump 24 for guiding the gas to be detected into the optical detection unit 23, and an internal filter unit 25 for cleaning the gas path inside the monitoring device. The optical detection unit 23 is internally provided with a standard light-transmitting template 21, and the standard light-transmitting template 21 is connected with the knob 1 in the automatic gear switching device through an internal structure.
The control device comprises two control boards 12 and 13 arranged on a device shell, wherein control modules are arranged in the two control boards 12 and 13, and each control module comprises an automatic control module, a remote control module, a local control module, a self-calibration module and a self-diagnosis module. The automatic control module is used for carrying out initialization setting and power-on self-calibration on the particulate matter concentration detection device 20 when the particulate matter concentration detection device 20 is started up, and controlling the particulate matter concentration detection device 20 to enter a measurement state; the remote control module is used for receiving a remote instruction sent by the upper computer, sending the remote instruction to the local control module and uploading feedback information of the local control module to the upper computer; the local control module is used for receiving a local or remote control instruction, converting the received local or remote control instruction into a control signal, sending the control signal to the self-calibration module or the self-calibration module, and receiving returned self-diagnosis information of zero calibration, calibration or state; the self-zeroing module is used for performing zero calibration on the measured value of the particulate matter concentration detection device 20 according to the received self-zeroing control signal and sending the self-zeroing result to the local control module; the self-calibration module is used for calibrating the measured value of the particulate matter concentration detection device 20 according to the received self-calibration control signal and sending the self-calibration result to the local control module; the self-diagnosis module performs a state self-diagnosis on the particulate matter concentration detection device 20 and returns state information to the local control module according to the self-calibration and the self-calibration result in the local control module.
The automatic control module comprises an initialization control module and a startup self-correction module. The initialization control module is used for initializing the particulate matter concentration detection device 20 and the particulate matter concentration detection device 20 when the particulate matter concentration detection device 20 is started; the startup self-calibration module is used for sequentially sending control signals to the self-calibration module and the self-calibration module to complete power-on self-calibration, and controlling the particulate matter concentration detection device 20 to enter a measurement state according to the state information collected by the self-diagnosis module.
The local control module comprises a timing self-calibration module, a remote control instruction processing module and a data storage module. The timing self-zeroing control module is used for periodically sending a self-zeroing control signal to the self-zeroing module according to a preset self-zeroing period; the timing self-calibration control module is used for periodically sending self-calibration control signals to the self-calibration module according to a preset self-calibration period. The remote control instruction processing module is used for receiving the remote instruction of the upper computer sent by the remote control module, converting the remote instruction of the upper computer into a control signal and sending the control signal to the self-calibration module or the self-calibration module. The data storage module is used for receiving and storing zero calibration, calibration and state diagnosis information returned by the self-calibration module, the self-calibration module or the self-diagnosis module.
The device housing includes a front side housing 15, a rear side housing 16, and an end housing 17.
Based on the online self-calibration air particulate matter detection device, the invention also provides a self-calibration and state self-diagnosis method of the online self-calibration air particulate matter detection device, which comprises the following steps:
1) After the particulate matter concentration detection device 20 is started, the automatic control module performs initialization setting and power-on self-calibration on the particulate matter concentration detection device 20, and then controls the particulate matter concentration detection device 20 to enter a measurement state.
Specifically, the initialization control module is configured to complete initialization setting, the startup self-calibration module is configured to sequentially send a control signal to the self-calibration module and the self-zero calibration module to complete power-on self-calibration, and control the particulate matter concentration detection device 20 to enter an automatic measurement state according to the state information collected by the self-diagnosis module.
2) The local or upper computer sends control instructions to the local control module or the remote control module through the control boards 12 and 13, and the local control module converts the received control instructions into corresponding control signals and sends the corresponding control signals to the self-calibration module or the self-calibration module.
3) After receiving the self-calibration control signal, the self-calibration module enters a corresponding self-calibration mode, sends a control signal to the motor 9, calibrates the measured value of the particulate matter concentration detection device 20, and sends the calibration result to the local control module.
The measured value of the particulate matter concentration detection device 20 before leaving the factory will pass through a calibration experiment, and reach the error range required by the technical standard. When the optical detection unit is used for a period of time or the external environment changes, the optical detection unit generates systematic errors due to internal pollution, aging of electrical components, deviation of an optical system caused by vibration and the like, or is influenced by external factors such as the use environment, climate, time drift and the like, the sensitivity of the optical detection unit changes, and the measured value possibly exceeds the allowable range of the errors, and the optical detection unit is calibrated at the moment. Because the detection device measures the concentration of the particulate matters by utilizing a light scattering method, a standard transparent template 21 (calibrated and conforming to error requirements) with known scattered light intensity is placed in a system light path during calibration, scattered light with certain intensity is generated, and the scattered light with certain intensity corresponds to a certain measured value, namely a calibration value S (the S value before the instrument leaves a factory is calibrated and recorded on a test meter of an instrument shell). If the measured value of the detection device is in the error range of the calibration value S, calibration is not needed, and if the measured value exceeds the error range of the calibration value S, the measured value is required to enter the error range through adjustment, so that the purpose of calibrating the measured value is achieved.
The self-calibration module enters a corresponding self-calibration mode according to the received self-calibration control signal, and the self-calibration mode is divided into a starting self-calibration mode, a timing self-calibration mode and a real-time remote control self-calibration mode. The starting self-calibration mode refers to: according to the self-calibration signal sent by the starting self-calibration module in the automatic control module, the particle concentration detection device 20 is self-calibrated, and the measured value drift caused by external factors such as environment, climate, time drift and the like before starting is mainly corrected; the timing self-calibration mode refers to: according to the periodic self-calibration signal sent by the timing self-calibration control module in the local control module, the particulate matter concentration detection device 20 is self-calibrated, and measured value drift caused by environmental, climate, time drift and other factors in a certain period is mainly corrected; the real-time remote control self-calibration mode refers to: the particulate matter concentration detection device 20 is self-calibrated according to a remote calibration command sent by the remote control module, and mainly corrects measured value drift or fault diagnosis caused by sudden changes of external factors such as environment, climate and the like.
A method for calibrating a measured value of a particulate matter concentration detection device 20 by a self-calibration module, comprising the steps of:
(1) the self-calibration module sends a control signal to the motor 9, so that the motor 9 rotates positively and the screw 4 is driven to rotate positively through the transmission mechanism 8.
(2) The screw 4 drives the guide shaft 3 to move through the positioning pin 10, and then the knob 1 is rotated through the coupler 2, so that the knob 1 is pushed to the calibration position, and the standard light-transmitting template 21 is located in the light path.
(3) The position sensing element 11 sends a position signal to the position sensor 26, the position sensor 26 sending a position signal of the knob 1 to the control device.
The position signal transmitted by the position sensing element 11 may be in the form of an electrical, optical, magnetic, or the like signal.
(4) When the control device receives the position signal from the position sensor 26, the motor 9 is controlled to stop moving and the knob 1 is kept in the calibration position.
(5) The optical detection unit 23 starts measurement, and after a number of measurement cycles, adjusts the measured value (i.e., the dispersion value) to a calibration value to restore the factory sensitivity, and stores the value as a self-diagnosis basis.
(6) The automatic calibration module controls the motor 9 to rotate reversely, so that the transmission mechanism 8 drives the screw 4 to rotate reversely, the screw 4 drives the guide shaft 3 to move through the positioning pin 10, the knob 1 rotates and is pushed to a measuring position, and the self-calibration process is finished.
4) After receiving the self-zeroing control signal, the self-zeroing module enters a corresponding self-zeroing mode, sends the control signal to the air inlet valve 18 and the particulate concentration detection device 20, performs zero calibration on the measured value of the particulate concentration detection device 20, and returns a zeroing result to the local control module.
In order to overcome the influence of different time drifts of the use environment on parameters and measurement results of the particulate matter concentration detection device 20 in aspects of an optical path, an air path, a circuit and the like, zero calibration needs to be performed on the particulate matter concentration detection device 20. This is because the components of the gas path, light path, circuit, etc. of any measuring instrument or measuring device will exhibit a certain noise value, i.e. a basic noise value, when operated in a certain environment. In order to obtain accurate measurement results, the value of the measured physical quantity is obtained after the basic noise value is removed from the measurement value. The basic noise value can correspondingly change along with the use environment, climate, time drift and other external factors of the measuring device, so that the zero point of the measured value drifts. Therefore, the zero calibration of the measured value, namely, zero calibration is required according to the change condition of external factors.
Similarly, the self-zeroing module enters a corresponding self-zeroing mode according to the received self-zeroing control signal. The starting-up self-zeroing mode refers to: according to the self-calibration control signal sent by the starting self-calibration module in the automatic control module, the particulate matter concentration detection device 20 is self-calibrated, and is mainly used for correcting zero drift of measured values caused by external factors such as environment, climate, time drift and the like before starting; the timed self-zeroing mode refers to: according to the self-zeroing control signal sent by the timing self-zeroing control module in the local control module, the particulate matter concentration detection device 20 is self-zeroed, and is mainly used for correcting zero drift of measured values caused by environmental, climate, time drift and other factors in a certain period; the real-time remote control self-zeroing mode refers to: the particulate matter concentration detection device 20 is self-zeroed according to a self-zeroing control signal sent by the remote control module, and is mainly used for correcting zero drift or fault diagnosis of measured values caused by sudden changes of external factors such as environment, climate, and the like.
A method for zero calibration of a measurement of a particulate matter concentration detection device 20 by a self-zeroing module, comprising the steps of:
(1) the self-zeroing module sends a control signal to the air inlet valve 18 to cut off the passage between the air passage inside the particulate matter concentration detection device 20 and the external air, so that a closed air passage is formed inside the particulate matter concentration detection device 20.
(2) The self-zeroing module sends a control signal to the particulate matter concentration detection device 20, the air pump 24 is started, air is filtered by the internal filtering unit 25 and enters the optical detection unit 23, so that the internal air of the particulate matter concentration detection device 20 is continuously filtered circularly in the closed air path until the particulate matter concentration of the internal air measured by the optical detection unit 23 is not changed any more, and the measurement value at the moment is recorded.
(3) The self-zeroing module sends a control signal to the air inlet valve 18 to allow the internal air path of the particulate concentration detection device 20 to communicate with the outside air, and the self-zeroing process is completed.
(4) Repeating the steps (1) - (3) for several times, averaging the obtained measured values to obtain an average value, and storing the average value as a basic noise value of the particulate matter concentration detection device 20, thereby completing the self-zeroing process.
5) The self-diagnosis module judges the state of the particulate matter concentration detection device 20 according to the self-calibration and self-calibration measurement results stored in the local control module, and returns corresponding state information.
Because of the change of external factors such as use environment, climate, time drift and the like, the condition that the measured value of the detection device is 0 or the measured value is lower than the normal value sometimes occurs, and at the moment, the self-diagnosis module judges the state of the detection device according to self-calibration results, and the judging method comprises the following steps:
if the measured value returned after calibration is within the allowable error range of the calibration value and the zero value after zero calibration is lower than the previous zero calibration value, judging that the system state is zero drift;
if the absolute value of the relative error value between the measured value and the calibration value after the calibration is more than 10 percent, even if the measured value is close to a zero value, judging that some devices in the optical detection unit are damaged, and prompting maintenance;
if the two items are normal, the operation period reaches the life period of the sampling power system, and maintenance is prompted.
The foregoing embodiments are only for illustrating the present invention, wherein the structures, connection modes, manufacturing processes, etc. of the components may be changed, and all equivalent changes and modifications performed on the basis of the technical solutions of the present invention should not be excluded from the protection scope of the present invention.
Claims (7)
1. The utility model provides an on-line self-correcting air particulate matter detection device, includes particulate matter concentration detection device, its characterized in that: the device comprises a gear automatic switching device, an air path switching device and a control device which are connected with the particulate matter concentration detection device;
the control device sends a control signal to the gear automatic switching device and the air path switching device according to a local or remote control instruction, and the gear automatic switching device and the air path switching device switch gears and air paths according to the received control signal so that the particulate matter concentration detection device is in different working modes;
the automatic gear switching device is arranged in a device shell and comprises a knob, a mechanical device, a supporting device, a power device and a position detection device, wherein the mechanical device is in linkage with the knob; one end of the knob is connected with a standard light-transmitting template in the particulate matter concentration detection device, and the other end of the knob is connected with the mechanical device; the gas circuit switching device is connected with a gas circuit inlet in the particulate matter concentration detection device;
the mechanical device comprises a coupler, a guide shaft, a screw rod and a locating pin which are sequentially connected, the other end of the coupler is connected with the knob, the guide shaft is provided with the locating pin for enabling the guide shaft to be in linkage with the screw rod, and the other end of the screw rod is arranged in the supporting device;
the supporting device comprises a supporting seat, a bearing and a bearing cover, wherein a round hole for the screw rod to penetrate out is formed in the supporting seat, and the other end of the screw rod is installed on the bearing after penetrating out of the supporting seat and is fixed by the bearing cover;
the power device comprises a motor and two transmission mechanisms, wherein the motor is fixedly arranged on the device shell and the supporting seat and is controlled by the control device; the output end of the motor is connected with the two transmission mechanisms, and the transmission mechanisms drive the screw rods to act; the position detection device comprises a position sensing element and a position sensor, wherein the position sensing element is arranged on the coupler and is used for sending a position signal to the position sensor according to the position of the knob, and the position sensor is used for sending the received position signal to the control device.
2. The on-line self-calibrating air particulate matter detection device of claim 1, wherein: the control device comprises a control board arranged on a device shell, wherein a control module is arranged in the control board and comprises an automatic control module, a local control module, a remote control module, a self-calibration module and a self-diagnosis module;
the automatic control module is used for carrying out initialization setting and power-on self-correction on the particulate matter concentration detection device when the particulate matter concentration detection device is started up, and controlling the particulate matter concentration detection device to enter a measurement state;
the remote control module is used for receiving a remote instruction sent by the upper computer, sending the remote instruction to the local control module and uploading feedback information of the local control module to the upper computer;
the local control module is used for receiving a local or remote control instruction, converting the local or remote control instruction into a control signal, transmitting the control signal to the self-calibration module or the self-calibration module, and receiving returned self-diagnosis information of zero calibration, calibration or state;
the self-zeroing module is used for carrying out zero calibration on the measured value of the particulate matter concentration detection device according to the received self-zeroing control signal and sending the self-zeroing result to the local control module;
the self-calibration module is used for calibrating the measured value of the particulate matter concentration detection device according to the received self-calibration control signal and sending the self-calibration result to the local control module;
the self-diagnosis module is used for carrying out state self-diagnosis on the particulate matter concentration detection device according to the self-calibration result or the self-calibration result in the local control module and returning state information to the local control module.
3. The on-line self-calibrating air particulate matter detection device of claim 2, wherein: the automatic control module comprises an initialization control module and a starting self-correction module; the initialization control module is used for initializing the particulate matter concentration detection device when the particulate matter concentration detection device is started; the starting self-calibration module is used for sequentially sending control signals to the self-calibration module and the self-calibration module to finish power-on self-calibration, and controlling the particulate matter concentration detection device to enter a measurement state according to the state information collected by the self-diagnosis module;
the local control module comprises a timing self-calibration module, a remote control instruction processing module and a data storage module; the timing self-zeroing module is used for periodically sending a self-zeroing control signal to the self-zeroing module according to a preset self-zeroing period; the timing self-calibration module is used for periodically sending self-calibration control signals to the self-calibration module according to a preset self-calibration period; the remote control instruction processing module is used for receiving the remote instruction of the upper computer sent by the remote control module, converting the remote instruction of the upper computer into a control signal and sending the control signal to the self-calibration module or the self-calibration module; the data storage module is used for receiving and storing zero calibration, calibration and state diagnosis information returned by the self-calibration module, the self-calibration module or the self-diagnosis module.
4. A self-calibrating, status self-diagnosing method using the on-line self-calibrating air particulate matter detecting device according to any one of claims 1 to 3, characterized by comprising the steps of:
1) After the detection device is started, the automatic control module performs initialization setting and power-on self-correction on the detection device and the particulate matter concentration detection device, and then controls the particulate matter concentration detection device to enter a measurement state;
2) The local or upper computer sends a control instruction to the local control module or the remote control module through the control panel, and the local control module converts the received control instruction into a corresponding control signal and sends the corresponding control signal to the self-calibration module or the self-calibration module;
3) After receiving the self-calibration control signal, the self-calibration module enters a corresponding self-calibration mode, sends the control signal to the gear automatic switching device and the particulate matter concentration detection device, calibrates the measured value of the particulate matter concentration detection device, and sends the calibration result to the local control module;
4) After receiving the self-zeroing control signal, the self-zeroing module enters a corresponding self-zeroing mode, sends the control signal to the air inlet valve and the particulate concentration detection device, performs zero calibration on the measured value of the particulate concentration detection device, and returns a zeroing result to the local control module;
5) The self-diagnosis module judges the state of the particulate matter concentration detection device according to the self-calibration and self-calibration measurement results in the local control module, and returns corresponding state information.
5. The self-calibrating, status self-diagnosing method for an on-line self-calibrating air particulate matter detecting device as defined in claim 4, wherein: in the step 3), the method for calibrating the measured value of the particulate matter concentration detection device by the self-calibration module comprises the following steps:
(1) the self-calibration module sends a control signal to the gear automatic switching device to start the motor, so that the motor rotates positively and drives the screw to rotate positively through the transmission mechanism;
(2) the screw drives the guide shaft to move through the locating pin, and then the knob is rotated through the coupler to push the knob to a calibration position, and the standard light-transmitting template is positioned in the light path;
(3) the position sensing element sends a position signal to the position sensor, and the position sensor sends the position signal of the knob to the control panel;
(4) when the control board receives a position signal sent by the position sensor, the motor is controlled to stop moving, and the knob is kept at a calibration position;
(5) the optical detection unit starts to measure, and after a plurality of measuring periods, the measured value is adjusted to be a calibration value and stored;
(6) the automatic calibration module controls the motor to rotate reversely, so that the transmission mechanism drives the screw rod to rotate reversely, the screw rod drives the guide shaft to move through the locating pin, the knob rotates and is pushed to the measuring position, and the self-calibration process is finished.
6. The self-calibrating, status self-diagnosing method for an on-line self-calibrating air particulate matter detecting device as defined in claim 4, wherein: in the step 4), the method for performing zero calibration of the measured value of the detection device by the self-zeroing module comprises the following steps:
(1) the self-zeroing module sends a control signal to the air inlet valve to cut off a passage between an internal air passage of the particulate concentration detection device and external air, so that a closed air passage is formed inside the particulate concentration detection device;
(2) the self-zeroing module sends a control signal to the particulate matter concentration detection device, the air pump is started, air enters the optical detection unit after being filtered by the internal filtering unit, so that the internal air of the particulate matter concentration detection device is continuously and circularly filtered in the closed air path until the particulate matter concentration of the internal air measured by the optical detection unit is not changed any more, and the measured value at the moment is recorded;
(3) the self-zeroing module sends a control signal to the air inlet valve, so that an internal air circuit of the particulate matter concentration detection device is communicated with external air, and the self-zeroing process is finished;
(4) repeating the steps (1) - (3) for several times, averaging the obtained measured values to obtain an average value, and storing the average value as a basic noise value of the particulate matter concentration detection device, thereby completing the self-zeroing process.
7. The self-calibrating, status self-diagnosing method for an on-line self-calibrating air particulate matter detecting device as defined in claim 4, wherein: in the step 5), the method for judging the state of the particulate matter concentration detection device by the self-diagnosis module comprises the following steps:
if the measured value returned after calibration is within the allowable error range of the calibration value and the zero value after zero calibration is lower than the previous zero calibration value, judging that the system state is zero drift;
if the absolute value of the relative error value between the measured value and the calibration value after the calibration is more than 10%, judging that the internal device of the optical detection unit is damaged, and prompting maintenance;
if the two items are normal, the operation period reaches the life period of the sampling power system, and maintenance is prompted.
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| US9417754B2 (en) | 2011-08-05 | 2016-08-16 | P4tents1, LLC | User interface system, method, and computer program product |
| CN110346253A (en) * | 2018-04-01 | 2019-10-18 | 上海先积集成电路有限公司 | A kind of method for self-calibrating of particle concentration detection system |
| CN108562524A (en) * | 2018-06-13 | 2018-09-21 | 北京博锐尚格节能技术股份有限公司 | Laser light scattering particle analyte detection device |
| CN114965867A (en) * | 2021-02-26 | 2022-08-30 | 杭州三花研究院有限公司 | Gas concentration detection method, gas detection device and control method thereof |
| CN113418844B (en) * | 2021-06-25 | 2023-03-14 | 山东诺方电子科技有限公司 | Dust load collection system and method capable of performing self-checking |
| CN114279916A (en) * | 2021-12-27 | 2022-04-05 | 河北先河环保科技股份有限公司 | Zero calibration method for particulate matter sensor |
| CN115290518B (en) * | 2022-10-10 | 2022-12-30 | 张家港谱析传感科技有限公司 | Take particle size spectrometer of self calibration |
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