CN113740582A - Magnetic field induction coil group for multi-dimensional balance magnetic field measurement, magnetic field sensing array and measurement system - Google Patents
Magnetic field induction coil group for multi-dimensional balance magnetic field measurement, magnetic field sensing array and measurement system Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/20—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices
- G01R15/202—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices using Hall-effect devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
- G01R33/06—Measuring direction or magnitude of magnetic fields or magnetic flux using galvano-magnetic devices
- G01R33/07—Hall effect devices
Abstract
The application discloses a magnetic field induction coil group, magnetic field sensing array and measurement system for multidimension balance magnetic field is measured, magnetic field induction coil group includes n1 magnetic field induction coil body, n1 is the even number that is more than or equal to 2, each magnetic field induction coil body all includes a magnetic field induction coil, each magnetic field induction coil is constant speed spiral threadlike, each magnetic field induction coil evenly arranges on a circumference, and the axis of each magnetic field induction coil all is the axis of perpendicular to circumference. The magnetic field induction coil is in a constant-speed spiral line shape, is wide in frequency band and good in response characteristic, is suitable for measuring current waveforms containing high-frequency components such as impact current, and can be applied to measuring impact current and broadband transient current. When the measurement of impulse current and broadband transient current is carried out, the magnetic field induction coil assembly has higher measurement sensitivity, can obtain higher signal-to-noise ratio, and enables the measurement result to be more accurate.
Description
Technical Field
The application relates to the technical field of electrical measurement, in particular to a magnetic field induction coil set, a magnetic field sensing array and a measuring system for multi-dimensional balanced magnetic field measurement.
Background
When lightning strikes on objects such as transmission lines, buildings and the like, extremely high voltage is generated, insulation flashover or breakdown is caused, and meanwhile, strong impact current is attached, so that very high ground potential lifting is generated, and equipment and personal safety are seriously damaged.
In order to research the influence of lightning current on equipment and further provide technical support for the design of the current tolerance capability of the equipment, the impact current test equipment simulates lightning current in a laboratory, and lightning protection equipment and electrical products such as a lightning arrester, a valve plate, a high-power resistor and the like need to be subjected to impact current tolerance tests.
The lightning current is a set containing currents in a certain frequency spectrum range, and as long as alternating currents inevitably generate alternating magnetic fields, the magnetic fields can be measured by a magnetic field sensor, magnetic field signals are converted into electric signals, and finally the electric signals are restored into actual waveforms of the measured currents.
The magnetic field induction coil is a small conductor annular coil, and due to the change of the measured magnetic field, the magnetic flux in the coil can be changed, so that induced electromotive force is generated, namely the induced voltage is in direct proportion to the change rate of the magnetic flux passing through the coil. The magnetic field induction coil works according to a Faraday electromagnetic induction principle, the magnetic field expands forwards along with the movement of the armature, and the changing magnetic field induces a changing signal in the transient magnetic field probe, so that the changing characteristic of the transient magnetic field probe signal can reflect the position of the armature. However, a magnetic field signal measured by one magnetic field induction coil can only reflect one point magnetic field value of the same space magnetic field, but there are many point magnetic fields with the same spacing, and the integrated calculation of the multiple point magnetic field values is difficult, and the accuracy of magnetic field measurement cannot be guaranteed.
Content of application
The application provides a magnetic field induction coil group, magnetic field sensing array and measurement system for multidimension balance magnetic field measurement can avoid power frequency magnetic field and impact transient magnetic field to measure difficulty, accuracy not good.
In a first aspect, embodiments of the present application provide a magnetic field induction coil assembly for multi-dimensional balanced magnetic field measurement, where the magnetic field induction coil assembly includes n1 magnetic field induction coil bodies, n1 is an even number greater than or equal to 2, each magnetic field induction coil body includes one magnetic field induction coil, each magnetic field induction coil is in a constant-speed spiral shape, each magnetic field induction coil is uniformly arranged on a circumference, and an axis of each magnetic field induction coil is perpendicular to an axis of the circumference.
In some of the embodiments, each of the magnetic field induction coils includes a first coil and a second coil, each of the first coil and the second coil is in a constant-velocity helical shape, the first coil and the second coil are stacked and arranged in an axial direction of the first coil and the second coil with a gap therebetween, and an outer end of the first coil is connected in series with an outer end of the second coil via a connection line.
In some embodiments, the inner end of the first coil has a first contact line, the first contact line protrudes from a side of the first coil facing away from the second coil, and the protruding end of the first contact line forms a first contact of the magnetic field induction coil. The inner end of the second coil is provided with a second contact line, the second contact line protrudes out of one side of the second coil, which is far away from the first coil, and the protruding end of the second contact line forms a second contact of the magnetic field induction coil.
In some embodiments, each magnetic field induction coil body comprises a circuit board, each magnetic field induction coil is respectively laid on each circuit board, the first coil and the second coil are respectively laid on two side surfaces of the circuit board, the circuit board is provided with a through hole, and the connecting wire is arranged in the through hole in a penetrating mode.
In a second aspect, embodiments of the present application provide a magnetic field sensing array for multi-dimensional balanced magnetic field measurement, including the magnetic field induction coil assembly and the outer frame in any of the above embodiments. The outer frame body is insulated and annular, and has a port, and is configured such that each magnetic field induction coil body is attached to the outer frame body, and such that each magnetic field induction coil is connected in series, and a magnetic field signal obtained by each magnetic field induction coil is output from the port.
In some of these embodiments, the outer frame has n2 slots, n2 equals n1, each slot having a first connection point and a second connection point, each slot connected in series via a wire located in the outer frame and connected to a port, the slots configured such that each magnetic field sensing coil body fits into the slot and such that the first contact and the second contact of each magnetic field sensing coil body are in contact with the first connection point and the second connection point, respectively.
In some embodiments, each slot is located on the outer peripheral surface of the outer frame. The port is located on the end face of the outer frame body.
In some embodiments, the outer frame body includes a first frame body and a second frame body, the first frame body and the second frame body are both semicircular, the first frame body and the second frame body are detachably mounted, each magnetic field induction coil body is divided into two groups and respectively mounted to the first frame body and the second frame body, and one group of magnetic field induction coil bodies located in the first frame body and the other group of magnetic field induction coil bodies located in the second frame body are symmetrically arranged.
In a third aspect, embodiments of the present application provide a measurement system for multi-dimensional balanced magnetic field measurement, including the magnetic field sensing array, the data acquisition structure, the digital integration structure, and the computational analysis structure in any of the above embodiments. The data acquisition structure is connected with the magnetic field sensing array and used for acquiring magnetic field signals output by the magnetic field sensing array and converting the magnetic field signals into digital signals. The digital integral structure is connected with the data acquisition structure and is used for integrating the digital signals output by the data acquisition structure. And the calculation analysis structure is connected with the digital integration structure and is used for analyzing and calculating the signals output by the digital integration structure according to preset parameters and algorithms, drawing a measured magnetic field change curve and solving time parameters and amplitude parameters of the measured magnetic field.
In some embodiments, the measurement system further includes a photoelectric conversion structure, the photoelectric conversion structure is connected to the data acquisition structure element and the calculation and analysis structure, and the photoelectric conversion structure is configured to convert a signal output by the digital integration structure into an optical signal and transmit the optical signal to the calculation and analysis structure.
According to the embodiment of the application, the magnetic field induction coil set for multi-dimensional balanced magnetic field measurement comprises n1 magnetic field induction coil bodies, n1 is an even number which is greater than or equal to 2, each magnetic field induction coil body comprises one magnetic field induction coil, each magnetic field induction coil is in a constant-speed spiral shape, each magnetic field induction coil is uniformly arranged on a circumference, and the axis of each magnetic field induction coil is perpendicular to the axis of the circumference. The magnetic field induction coil is in a constant-speed spiral line shape, is wide in frequency band and good in response characteristic, is suitable for measuring current waveforms containing high-frequency components such as impact current, and can be applied to measuring impact current and broadband transient current. When the measurement of impulse current and broadband transient current is carried out, the magnetic field induction coil assembly has higher measurement sensitivity, can obtain higher signal-to-noise ratio, and enables the measurement result to be more accurate. In addition, when the impulse current and the broadband transient current are measured, the magnetic field induction coil assembly can obtain magnetic field measurement values at different positions, and can effectively reduce measurement adverse factors caused by position eccentricity of the magnetic field sensing array by combining mean value processing, and improve measurement accuracy. In addition, the magnetic field induction coil assembly further has the advantages of small size, light weight, convenience in installation and the like.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
FIGS. 1-3 are schematic diagrams of magnetic field induction coils at three angles according to embodiments of the present application;
FIG. 4 is a schematic structural diagram of a magnetic field sensing array in an embodiment of the present application;
FIGS. 5-10 are schematic views of the outer frame body at six angles in the embodiment of the present application;
FIG. 11 is a schematic structural diagram of a measurement system according to an embodiment of the present application;
fig. 12 is a schematic flow chart of a measurement method in the embodiment of the present application.
Detailed description of the preferred embodiment
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
Referring to fig. 1-3, embodiments of the present application provide a magnetic field induction coil assembly 10 for multi-dimensional balanced magnetic field measurements. The magnetic-field-inducing coil group 10 includes n1 magnetic-field-inducing coil bodies 101, n1 is an even number greater than or equal to 2, e.g., n1 may be 6. Each magnetic field induction coil body 101 includes a magnetic field induction coil 100 for receiving magnetic lines of force and converting magnetic field signals into electrical signals. Each magnetic field induction coil 100 is in the shape of a constant-speed spiral. The turn-to-turn pitch of each magnetic field induction coil 100 may be about 1 mm. The magnetic field induction coils 100 are uniformly arranged on one circumference. The axis of each magnetic field induction coil 100 is perpendicular to the axis of the circumference. The arrangement makes the magnetic flux receiving surface of the magnetic field induction coil 100 on a circumference line and perpendicular to the circumference line, and the direction of the magnetic force line is parallel to the circumference line, thereby ensuring that the magnetic field induction coil 100 is completely linked with the magnetic field to be measured, and greatly improving the measuring sensitivity.
Referring to fig. 1-3, each magnetic field induction coil 100 may include a first coil 1000 and a second coil 1001. The first coil 1000 and the second coil 1001 are each in the shape of a constant velocity spiral. The first coil 1000 and the second coil 1001 are arranged in a stacked manner with a space in the axial direction of the first coil 1000 and the second coil 1001. The outer end of the first coil 1000 and the outer end of the second coil 1001 may be connected in series via a connection line 1002. The connection line 1002 may vertically connect the first coil 1000 and the second coil 1001. The magnetic field induction coil 100 is in a constant-speed spiral shape due to the arrangement, stray capacitance is not increased, and the sensitivity coefficient of the output voltage of the coil is greatly improved through double-layer series connection.
Referring to fig. 1-3, the inner end of the first coil 1000 may have a first contact wire 1003, the first contact wire 1003 may protrude from a side of the first coil 1000 facing away from the second coil 1001, and the protruding end of the first contact wire 1003 constitutes a first contact 1005 of the magnetic field sensing coil 100. The inner end of the second coil 1001 may have a second contact wire 1004, and the second contact wire 1004 may protrude from a side of the second coil 1001 facing away from the first coil 1000, the protruding end of the second contact wire 1004 constituting a second contact 1006 of the magnetic field sensing coil 100. The above arrangement is such that the first contact 1005 and the second contact 1006 are located on both sides of the center of the magnetic field induction coil 100, respectively.
Each magnetic field induction coil body 101 may include one circuit board. The circuit board may be a printed circuit board, PCB. The magnetic field induction coils 100 are respectively laid on the circuit boards. The first coil 1000 and the second coil 1001 are respectively laid on two side surfaces of the circuit board. The circuit board may have a through hole, and the connection line 1002 is inserted into the through hole. When above-mentioned setting makes magnetic field induction coil 100's turn-to-turn spacing be about 1mm, the circuit board guarantees the concentricity of coil to ensure that the coil interval is even, thereby guarantee output voltage signal's stability, each magnetic field induction coil 100's turn-to-turn capacitance and ground capacitance can be about 1pF, have guaranteed that the coil has good high frequency response characteristic.
Referring to fig. 4 to 10, an embodiment of the present application further provides a magnetic field sensing array 1 for multi-dimensional balanced magnetic field measurement, including the magnetic field sensing coil assembly 10 and the outer frame 11 in any of the above embodiments. The magnetic field sensing array 1 obtains the sum of the magnetic field strengths of the same distance and different directions in the measured magnetic field, and accurately outputs the change curve of the magnetic field strength of the point magnetic field along with time.
Referring to fig. 5, the outer frame 11 is insulating and may be made of an insulating material. The outer frame 11 has an annular shape. The outer frame 11 may have a port 110 thereon, and the port 110 may be a BNC-type output port. The port 110 is located on an end surface of the outer frame 11. The outer frame 11 is arranged such that each magnetic field induction coil body 101 is attached to the outer frame 11, the magnetic field induction coils 100 are connected in series, and a magnetic field signal obtained by each magnetic field induction coil 100 is output from the port 110.
Referring to fig. 6 to 10, the outer frame 11 may have n2 slots 111, n2 is equal to n1, and n2 is 6, that is, the slots 111 are arranged at 60 ° intervals. Each slot 111 may be located on the outer circumferential surface of the outer frame 11. Each slot 111 may have a first contact point 1110 and a second contact point (not shown) for contacting with the first contact 1005 and the second contact 1006 of the magnetic field induction coil 100, respectively. The first connection contact 1110 and the second connection contact may be respectively located at both sidewalls of the socket 111. The slots 111 are connected in series via the wires 112 in the outer frame 11 to constitute a loop of the magnetic field sensing array 1 and are connected to the port 110, and the slots 111 are configured such that the magnetic field sensing coil bodies 101 are installed in the slots 111 and the first contact 1005 and the second contact 1006 of the magnetic field sensing coils 100 are in contact with the first connection contact 1110 and the second connection contact, respectively. The magnetic field induction coil 100 can be replaced randomly by the arrangement, and the magnetic field induction coil 100 with different turns can be selected according to the size of the magnetic field to be measured.
Referring to fig. 5 to 10, the outer frame 11 includes a first frame 112 and a second frame 113, the first frame 112 and the second frame 113 are both semicircular, the first frame 112 and the second frame 113 are detachably mounted, each of the magnetic field induction coil bodies 101 is divided into two groups and respectively mounted to the first frame 112 and the second frame 113, and one group of the magnetic field induction coil bodies 101 located in the first frame 112 and the other group of the magnetic field induction coil bodies 101 located in the second frame 113 are symmetrically arranged. The outer frame body 11 is more convenient to mount during field measurement, and complex dismounting work is avoided.
Referring to fig. 9-10, the first frame 112 may have a recess 114 thereon, and the center of the recess 114 may have a first metal contact 1140. The second frame 113 may have a rib 115 for engaging with the groove 114. The center of the rib 115 may have a second metal contact 1150, the second metal contact 1150 for contacting the first metal contact 1140. The above arrangement realizes electrical connection of the internal circuits of the first housing 112 and the second housing 113.
Referring to fig. 11, an embodiment of the present application further provides a measurement system for multi-dimensional balanced magnetic field measurement, including the magnetic field sensing array 1, the data acquisition structure 2, the digital integration structure 3, and the calculation and analysis structure 4 in any of the above embodiments. The data acquisition structure 2 is connected with the magnetic field sensing array 1, and the data acquisition structure 2 is used for acquiring the magnetic field signal output by the magnetic field sensing array 1 and converting the magnetic field signal into a digital signal. The data acquisition structure 2 may be connected to the magnetic field sensing array 1 via a high frequency cable. Digital integral structure 3 is connected with data acquisition structure 2, and digital integral structure 3 is used for carrying out the integration to the digital signal of data acquisition structure 2 output. The digital integration structure 3 employs a digital integration method. The calculation analysis structure 4 is connected with the digital integration structure 3, and the calculation analysis structure 4 is used for analyzing and calculating the signal output by the digital integration structure 3 according to preset parameters and algorithms, drawing a measured magnetic field change curve and solving time parameters and amplitude parameters of the measured magnetic field.
The measuring system can further comprise a photoelectric conversion structure 5, the photoelectric conversion structure 5 is connected with the data acquisition structure 2 element and the calculation analysis structure 4, and the photoelectric conversion structure 5 is used for converting the signal output by the digital integration structure 3 into an optical signal and then transmitting the optical signal to the calculation analysis structure 4. The photoelectric conversion structure 5 is connected with the calculation analysis structure 4 through optical fibers, so that the folding and reflection of the long connecting cable on the waveform and high-frequency oscillation are eliminated, and the signal is ensured not to be distorted.
Referring to fig. 12, an embodiment of the present application further provides a measurement method for multi-dimensional balanced magnetic field measurement, including the following steps:
1. the magnetic field sensing array 1 is formed by selecting 6 magnetic field sensing coil bodies 101 including 15 turns of magnetic field sensing coils 100 to form a magnetic field sensing coil group 10, and installing the 6 magnetic field sensing coil bodies 101 of the magnetic field sensing coil group 10 in 6 slots 111 of an outer frame 11 respectively.
2. The outer frame 11 of the magnetic field sensor array 1 is separated into the first frame 112 and the second frame 113, the inrush current circuit is positioned at the center of the outer frame 11, and then the first frame 112 and the second frame 113 are assembled. When the peak value of the current output by the impulse current loop is 5.36kA, the peak value of the voltage output by the magnetic field sensing array 1 is 43.5V.
3. The port 110 of the magnetic field sensing array 1 is connected with the data acquisition structure 2 through a high-frequency cable, the data acquisition structure 2 is connected with the digital integration structure 3, the digital integration structure 3 is connected with the photoelectric conversion structure 5, and the photoelectric conversion structure 5 is connected with the calculation analysis structure 4 through an optical fiber.
4. To increase the sensitivity of the magnetic field sensing array 1, the larger the number of turns of the magnetic field sensing coil 100 is, the larger the induced voltage is based on the same magnetic field measurement, and it is only necessary to replace the magnetic field sensing coil body 101 including the magnetic field sensing coil 100 of 15 turns in the 6 slots 111 of the magnetic field sensing array 1 with the magnetic field sensing coil body 101 including the magnetic field sensing coil 100 of 20 turns.
5. After the measurement of the impact current is completed, the outer frame 11 of the magnetic field sensing array 1 is disassembled into the first frame 112 and the second frame 113, and the disassembling of the magnetic field sensing array 1 can be completed.
The same or similar reference numerals in the drawings of the present embodiment correspond to the same or similar components; in the description of the present application, it should be understood that if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", etc. based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not an indication or suggestion that the indicated device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes, and are not to be construed as limitations of the present patent, and those skilled in the art can understand the specific meaning of the above terms according to their specific circumstances.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (10)
1. A magnetic field induction coil assembly for multi-dimensional balanced magnetic field measurement,
the magnetic field induction coil group comprises n1 magnetic field induction coil bodies, n1 is an even number which is greater than or equal to 2, each magnetic field induction coil body comprises a magnetic field induction coil, each magnetic field induction coil is in a constant-speed spiral shape, each magnetic field induction coil is uniformly arranged on a circumference, and the axis of each magnetic field induction coil is perpendicular to the axis of the circumference.
2. The magnetic field induction coil assembly of claim 1,
each magnetic field induction coil all includes first coil and second coil, first coil with the second coil is the constant speed helix shape, first coil with the second coil is in the axial of first coil with the second coil is range upon range of and is arranged and have the interval, the outer end of first coil with the outer end of second coil is through the connecting wire series connection.
3. The magnetic field induction coil assembly of claim 1,
the inner end of the first coil is provided with a first contact line, the first contact line protrudes out of one side of the first coil, which is far away from the second coil, and the protruding end of the first contact line forms a first contact of the magnetic field induction coil;
the inner end of the second coil is provided with a second contact line, the second contact line protrudes out of one side of the second coil, which is far away from the first coil, and the protruding end of the second contact line forms a second contact of the magnetic field induction coil.
4. The magnetic field induction coil assembly of claim 2,
each magnetic field induction coil body comprises a circuit board, each magnetic field induction coil is respectively laid on each circuit board, the first coil and the second coil are respectively laid on two side faces of each circuit board, each circuit board is provided with a through hole, and the connecting wire penetrates through the through holes.
5. A magnetic field sensing array for multi-dimensional balanced magnetic field measurement, comprising:
the magnetic field induction coil assembly of any of claims 1-4; and
and an annular outer frame body insulated from the outer frame body, the outer frame body having a port, the outer frame body being configured such that each of the magnetic field induction coil bodies is attached to the outer frame body, the magnetic field induction coils are connected in series, and a magnetic field signal obtained by each of the magnetic field induction coils is output from the port.
6. The magnetic field sensing array of claim 5,
the outer frame body has n2 slots, n2 is equal to n1, each slot has a first connection contact and a second connection contact, each slot is connected in series via a wire in the outer frame body and connected to the port, and the slots are configured such that each magnetic field induction coil body is fitted into the slot and such that a first contact and a second contact of each magnetic field induction coil body are in contact with the first connection contact and the second connection contact, respectively.
7. The magnetic field sensing array of claim 6,
each slot is positioned on the peripheral surface of the outer frame body;
the port is located on the end face of the outer frame body.
8. The magnetic field sensing array of claim 5,
the outer frame body comprises a first frame body and a second frame body, the first frame body and the second frame body are both semicircular, the first frame body and the second frame body are detachably mounted, each magnetic field induction coil body is divided into two groups which are respectively mounted on the first frame body and the second frame body, and one group of magnetic field induction coil body located in the first frame body and the other group of magnetic field induction coil body located in the second frame body are symmetrically arranged.
9. A measurement system for multi-dimensional balanced magnetic field measurement, comprising:
the magnetic field sensing array of any of claims 5-8;
the data acquisition structure is connected with the magnetic field sensing array and used for acquiring the magnetic field signal output by the magnetic field sensing array and converting the magnetic field signal into a digital signal;
the digital integration structure is connected with the data acquisition structure and is used for integrating the digital signal output by the data acquisition structure; and
and the calculation analysis structure is connected with the digital integration structure and is used for analyzing and calculating the signals output by the digital integration structure according to preset parameters and algorithms, drawing a measured magnetic field change curve and solving time parameters and amplitude parameters of the measured magnetic field.
10. The measurement system of claim 9, further comprising:
and the photoelectric conversion structure is connected with the data acquisition structure element and the calculation analysis structure, and is used for converting the signal output by the digital integration structure into an optical signal and then transmitting the optical signal to the calculation analysis structure.
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| US20050156587A1 (en) * | 2004-01-16 | 2005-07-21 | Fieldmetrics Inc. | Current sensor |
| FR2895802A1 (en) * | 2005-12-30 | 2007-07-06 | Commissariat Energie Atomique | Homogenous magnetic field generating device for e.g. magnetic resonance imaging installation, has plane single pancake coils with ends, and transition section providing shift equal to transverse dimension of conductor along horizontal axis |
| CN101500369A (en) * | 2008-01-30 | 2009-08-05 | 北京北方微电子基地设备工艺研究中心有限责任公司 | Inductor coupling coil and inductor coupling plasma generation apparatus |
| US20150377929A1 (en) * | 2014-06-26 | 2015-12-31 | General Electric Company | Current sensing system |
| CN104941069A (en) * | 2015-07-16 | 2015-09-30 | 重庆大学 | High-strength uniform-induction electric field generator based on Archimedes spiral coil |
| CN111092497A (en) * | 2020-01-02 | 2020-05-01 | 上海大学 | Magnetic induction wireless power transmission coil and magnetic induction wireless power transmission system |
| CN111856345A (en) * | 2020-04-16 | 2020-10-30 | 中国电力科学研究院有限公司 | Broadband magnetic field sensor device and method for measuring impulse current |
| CN112526417A (en) * | 2020-11-23 | 2021-03-19 | 中国电力科学研究院有限公司 | Multi-dimensional balanced magnetic field measurement system and method |
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