KR101577801B1 - Three-dimensional strain sensor using piezo-fiber, and construction using the same - Google Patents

Three-dimensional strain sensor using piezo-fiber, and construction using the same Download PDF

Info

Publication number
KR101577801B1
KR101577801B1 KR1020140075047A KR20140075047A KR101577801B1 KR 101577801 B1 KR101577801 B1 KR 101577801B1 KR 1020140075047 A KR1020140075047 A KR 1020140075047A KR 20140075047 A KR20140075047 A KR 20140075047A KR 101577801 B1 KR101577801 B1 KR 101577801B1
Authority
KR
South Korea
Prior art keywords
plate
fiber
fiber sensors
change
strain
Prior art date
Application number
KR1020140075047A
Other languages
Korean (ko)
Inventor
박영빈
황상하
정찬우
Original Assignee
국립대학법인 울산과학기술대학교 산학협력단
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 국립대학법인 울산과학기술대학교 산학협력단 filed Critical 국립대학법인 울산과학기술대학교 산학협력단
Priority to KR1020140075047A priority Critical patent/KR101577801B1/en
Application granted granted Critical
Publication of KR101577801B1 publication Critical patent/KR101577801B1/en

Links

Images

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
    • G01B7/16—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L1/00—Measuring force or stress, in general
    • G01L1/18—Measuring force or stress, in general using properties of piezo-resistive materials, i.e. materials of which the ohmic resistance varies according to changes in magnitude or direction of force applied to the material

Abstract

The present invention measures a resistance change of a fiber sensor, by connecting the fiber sensor in between a portion which needs a strain measurement, and a portion which to be a reference portion to measure relative changes in the portion which needs a strain measurement, such that, the present invention may conveniently measure a relative change in position and rotational angle of the portion which needs a strain measurement.

Description

TECHNICAL FIELD [0001] The present invention relates to a three-dimensional strain measurement device using a piezoelectric fiber,

More particularly, the present invention relates to a three-dimensional strain measurement device using a fiber sensor fabricated by mixing a polymer material and a conductive material, and a structure having the same. .

Generally, a strain gauge is a sensor that detects mechanical strain by converting it into an electric signal. The strain gauge can be glued or inserted into the surface of a machine or structure to measure the change in the fine dimensions of the surface or the inside thereof, thereby determining the stress for confirming the strength and safety of the structure. In the case of a general strain gauge made of a metal wire or a metal thin film, there is a disadvantage in that it is sensitive to humidity and has a low signal intensity. In the case of a semiconductor type strain gauge using a piezoresistance effect of a semiconductor material, there is a problem that the temperature range is very narrow due to temperature sensitivity.

In recent years, there is growing interest in a technique for manufacturing a strain sensor composed of a composite including a polymer and a conductive material.

U.S. Patent No. 8,250,927

It is an object of the present invention to provide a three-dimensional strain measuring device capable of more accurately measuring a three-dimensional position change and a rotational angle change, and a structure provided with the three-dimensional strain measuring device.

The apparatus for measuring three-dimensional strain using a piezoelectric fiber according to the present invention comprises a first plate, a second plate arranged to be spaced apart from the first plate by a predetermined distance in the vertical direction, And a sensor module including a plurality of fiber sensors connecting the first plate and the second plate, wherein a relative positional change and a relative rotational angle change between the first plate and the second plate Piezoelectric fibers are used to measure strain by measuring the resistance of the fiber sensors.

The present invention relates to a method for measuring strain by measuring a change in resistance of a fiber sensor by connecting a portion where a strain measurement is required and a portion serving as a reference for measuring a relative change of a strain measurement portion with a fiber sensor, It is possible to easily measure the relative positional change and the rotational angle change.

The present invention has an advantage in that a high sensitivity and a temperature stability can be secured by mixing a polymer resin and a conductive material to produce a fiber sensor having a fiber form.

1 is a schematic view of a sensor module of a three-dimensional strain measurement apparatus according to an embodiment of the present invention.
FIG. 2 is a view showing a state where normal strain is generated in the sensor module shown in FIG. 1. FIG.
FIG. 3 is a view showing a state in which a torsion strain is generated in the sensor module shown in FIG. 1. FIG.
4 is a view showing an example of a 3D strain measuring apparatus according to another embodiment of the present invention.
5 is a view showing another example of a 3D strain measuring apparatus according to another embodiment of the present invention.
6 is a view showing a 3D strain measuring apparatus according to another embodiment of the present invention.
FIG. 7 is a view showing a sensor module for showing a method of measuring a positional change and a rotational angle change using a three-dimensional strain measurement device according to the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

1 is a schematic view of a sensor module of a three-dimensional strain measurement apparatus according to an embodiment of the present invention. FIG. 2 is a view showing a state in which the normal strain is measured in the sensor module shown in FIG. 1. FIG. FIG. 3 is a view showing a state in which the torsion strain is measured on the sensor module shown in FIG. 1. FIG.

1 to 3, an apparatus for measuring three-dimensional strain using a piezoelectric fiber according to the present invention includes a sensor module 20 including a first plate 11, a second plate 12, and a plurality of fiber sensors 20, (10).

Although the first plate 11 is described as being formed in the shape of a square plate, it is of course possible to have a shape other than a square. The first plate 11 may be composed of one unit cell or a plurality of unit cells. Referring to FIG. 1, in the present embodiment, the first plate 11 is composed of four unit cells 11a, 11b, 11c, and 11d.

The second plate 12 is spaced apart from the first plate 11 by a predetermined distance in the vertical direction. The second plate 12 is also formed in a rectangular plate shape, but the present invention is not limited thereto. The second plate 12 is disposed on the upper side of the first plate 11, for example, to be described below. The second plate 12 may be composed of one unit cell or a plurality of unit cells. In the present embodiment, the second plate 12 is composed of one unit cell, for example, will be described.

Either one of the first plate 11 and the second plate 12 is installed in a portion where strain measurement is required and the other is fixed so as to be a reference without a position or angle change during strain measurement. In the present embodiment, the first plate 11 is fixedly installed as a reference, and the second plate 12 is installed at a portion where strain measurement is required.

The plurality of fiber sensors 20 are in the form of a piezo fiber in which a polymer and a conductive material are mixed. The polymer is exemplified by a polypropylene which is a thermoplastic resin. For example, carbon nanotubes (CNTs) are used as the conductive material. The plurality of fiber sensors 20 are made of fiber by mixing the polymer and the conductive material, followed by melt spinning. The plurality of fiber sensors 20 include four first fiber sensors 21 connecting the vertexes of the first plate 11 and the vertexes of the second plate 12 with each other, And four second fiber sensors 22 connecting the center point C of the plate 11 and the vertexes of the second plate 12. The plurality of fiber sensors 20 are connected in a pulled state when they are tightened when they are connected to the first plate 11 and the second plate 12. An electrode may be provided at a portion where the plurality of fiber sensors 20 are connected.

Referring to FIGS. 2 and 3, when the second plate 12 is deformed, the first plate 11 remains fixed without being deformed. Therefore, the deformation of the plurality of fiber sensors 20 is generated, the strain variation of the plurality of fiber sensors 20 is measured and the deformation of the plurality of fiber sensors 20 is measured, The change of the position of the first plate 11 or the change of the rotation angle can be calculated.

The three-dimensional strain measuring device constructed as described above can be installed on the blade of the wind power generator. The sensor module 10 is installed on the hollow portion of the blade, the fiber sensors 20 are disposed on the hollow portion, and the sensor module 10 is disposed on the surface facing the hollow portion, One plate 11 and the second plate 12 may be installed.

It is also possible that the 3D strain measuring apparatus is applied to a structure. The structure includes a bridge or a high-rise building.

In addition, the 3D strain measuring device can be used to measure a change in position and rotation angle of a plane, which is made of one plane or several grids, such as a Stewart platform.

Therefore, the 3-D strain measurement apparatus can be applied to the measurement of pressure applied to the surface of a structure, such as a blade structure, a large structure such as a building structure, a stauart platform, etc., There is an advantage that a safety diagnosis can be performed. However, the present invention is not limited to this, and it is of course possible that the 3D strain measuring device is installed on an aircraft wing or the like.

4 and 5 are views showing a 3D strain measuring apparatus according to another embodiment of the present invention.

4 and 5, a 3D strain measuring apparatus according to another embodiment of the present invention includes a first plate 31, a second plate 32, and a plurality of fiber sensors 40, The first plate 31 and the second plate 32 are formed of different number of unit cells.

4, the first plate 31 is composed of nine unit cells 11, 12, 13, 14, 15, 16, 17, 18 and 19 (u11 to u19) 32 are made up of four 21, 22, 23, 24 unit cells u21 to u24, for example. Here, the unit cells are all square.

The 9th, 11th, 12th, 13th, 14th, 15th, 16th, 17th, 18th and 19th unit cells u11 through u19 and the four 21th, 22nd, 23th and 24th unit cells u21 through u24, Of fiber sensors 40. The fiber sensors 40 of FIG.

The four vertexes of the 21st unit cell u21 are connected to the vertexes of the four 11th, 12th, 14th and 15th unit cells u11, u12, u14 and u15, ). The four vertexes of the twenty-first unit cell u21 are connected to the middle point C1 of the four eleventh, twelfth, fourteenth and fifteenth unit cells u11, u12, u14 and u15, Lt; / RTI >

Similarly, the four vertexes of the twenty-second unit cell u22 are connected to the vertexes of the four twelfth, thirteenth, fifteenth, and sixteen unit cells u12, u13, u15, and u16 by the fiber sensor. The four vertexes of the twenty-second unit cell u22 are connected to the middle point C2 of the four twelfth, thirteenth, fifteenth and sixteenth unit cells u12, u13, u15 and u16, Lt; / RTI >

The 23rd unit cell 32c and the 24th unit cell 32d are also connected in the same manner as described above.

Here, if the 21st unit cell u21, the 11th, 12th, 14th and 15th unit cells u11, u12, u14, u15 and the fiber sensors 40 connecting them are referred to as one sensor module , And a plurality of sensor modules are arranged in a horizontal direction to form a matrix structure. However, when a plurality of sensor modules are arranged in the horizontal direction, it is possible to omit unit cells and sensors which are overlapped.

5, the first plate 31 is composed of 36 unit cells, and the second plate 32 is composed of 25 unit cells. The method of connecting the unit cells of the first plate 31 and the unit cells of the second plate 32 with the fiber sensors is the same as that described with reference to FIG.

Referring to FIGS. 4 and 5, one unit cell on the second plate 32 is connected to the four unit cells on the first plate 31 by the fiber sensors 40. One unit cell on the second plate 32, four unit cells on the first plate 31 connected to the second plate 32, and the fiber sensors 40 are referred to as one sensor module, Direction to form a matrix structure. However, when a plurality of sensor modules are arranged in the horizontal direction, it is possible to omit unit cells and sensors which are overlapped.

Meanwhile, FIG. 6 is a view showing a 3D strain measuring apparatus according to another embodiment of the present invention.

Referring to FIG. 6, the 3D strain measuring apparatus according to another embodiment of the present invention is different from the above embodiments in that a plurality of sensor modules are stacked in a vertical direction to form a multi-layer structure.

The three-dimensional strain measuring device is composed of two first and second layer sensor modules 100 and 200, but the present invention is not limited thereto.

The first layer sensor module 100 includes a first plate 101 serving as a reference surface, a second plate 101 disposed on the first plate 101 at a predetermined distance from the first plate 101, And a plurality of first layer fiber sensors 103 connecting the first plate 101 and the second plate 102 to each other. The first plate 101 and the second plate 102 may be formed of different numbers of unit cells and the method of connecting the unit cells to the first fiber sensors 103 is as described above.

The second layer sensor module 200 includes a second plate 102 and a second plate 102 spaced apart from the second plate 102 by a predetermined distance, A third plate 203 for measuring an angle change and a plurality of second layer fiber sensors 204 connecting the second plate 102 and the third plate 203. That is, the second plate 102 of the first layer sensor module 100 may be used as a reference surface of the second layer sensor module 200.

Therefore, the relative positional change and the relative rotational angle change of the second plate 102 with respect to the first plate 101 can be measured through the resistance change of the first layer fiber sensors 103. The relative positional change and the relative rotational angle change of the third plate 203 with respect to the second plate 102 can be measured through the resistance change of the second layer fiber sensors 204.

FIG. 7 is a view illustrating a sensor module for indicating a method of measuring a positional change and a rotational angle change of a three-dimensional strain measurement device according to the present invention.

Referring to FIG. 7, the sensor module includes a first plate 110, a second plate 120, and a plurality of fiber sensors 130.

At this time, the plurality of fiber sensors 130 are all connected in a pulled-up state, and the nominal strain e of the plurality of fiber sensors 130 is measured to be greater than zero.

The first plate 110 is fixed and the rotation angles?,?, And? Rotating in the x, y, and z axis directions of the second plate 120 are limited within a range between -90 degrees and 90 degrees. .

The length (a) of the fiber sensor 130 in the initial state is expressed by Equation (1).

[Equation 1]

Figure 112014057460359-pat00001

Where e is the nominal strain and L 0 is the length of the fiber sensor when the nominal strain is zero.

(X 0 , y 0 , z 0 ) and a post-rotation position (x f , y) when rotating by α, β and γ with respect to the x, y and z axes with respect to the center of the second plate 120 f, z f ) is expressed by Equation (2).

&Quot; (2) "

Figure 112015098647206-pat00031

delete

Here,?,?,? Denote the angles in the counterclockwise direction about the x axis, the y axis, and the z axis, respectively.

The relationship between the length of the segment P d P f and the nominal strain of the fiber sensor is shown in Equation (3). Here, P d is a point on the first plate 110, P u is a point on the second plate 120, and P f is a distance between the second plate 120 ).

&Quot; (3) "

Figure 112014057460359-pat00003

As described above, by calculating the length of the segment P d P f using the distance between two points and substituting the corresponding nominal strain (e) value, x, y, z, .

Hereinafter, a method of determining the position and direction of the second plate 120 when the nominal strain value is known will be described. The nominal strain may be calculated according to the measured resistance change and the change in resistance of the fiber sensors.

First, a case where the second plate 120 is moved in parallel by (x, y, z) will be described.

The equation for the line segment A d A f is shown in Equation (4).

&Quot; (4) "

Figure 112014057460359-pat00004

Here, x, y, and z represent distances moved in parallel along the x-axis, the y-axis, and the z-axis, respectively, and a represents the lengths of the first and second plates 110 and 120. e 1 represents the nominal strain of the fiber sensor 1.

The equation for line segment OA f is shown in equation (5).

&Quot; (5) "

Figure 112014057460359-pat00005

The equation for the line segment OB f is shown in Equation (6).

&Quot; (6) "

Figure 112014057460359-pat00006

The equation for the line OD f is shown in Equation (7).

&Quot; (7) "

Figure 112014057460359-pat00007

Subtracting Equation (5) from Equation (6) yields Equation (8).

&Quot; (8) "

Figure 112014057460359-pat00008

Subtracting Equation (7) from Equation (5) yields Equation (9).

&Quot; (9) "

Figure 112014057460359-pat00009

Substituting Equations (8) and (9) into Equation (1) yields Equation (10).

&Quot; (10) "

Figure 112014057460359-pat00010

Therefore, it is possible to obtain the distance moved in parallel to the x-axis, the y-axis and the z-axis from the equations (8) to (10).

 On the other hand, when the second plate 120 rotates by the rotation angle?, A method of calculating the rotation angle is as follows.

The equation for the segment A d A f is as follows.

&Quot; (11) "

Figure 112014057460359-pat00011

&Quot; (12) "

Figure 112014057460359-pat00012

&Quot; (13) "

Figure 112014057460359-pat00013

On the other hand, when the second plate 120 rotates by the rotation angle?, A method of calculating the rotation angle is as follows.

In the segment A d A f ,

&Quot; (14) "

Figure 112014057460359-pat00014

&Quot; (15) "

Figure 112014057460359-pat00015

In the segment D d D f ,

&Quot; (16) "

Figure 112014057460359-pat00016

&Quot; (17) "

Figure 112014057460359-pat00017

Subtracting Equation (15) from Equation (17) yields Equation (18).

&Quot; (18) "

Figure 112014057460359-pat00018

On the other hand, when the second plate 120 rotates by the rotation angle?, A method of calculating the rotation angle is as follows.

In the segment A d A f ,

&Quot; (19) "

Figure 112014057460359-pat00019

&Quot; (20) "

Figure 112014057460359-pat00020

In the segment B d B f ,

&Quot; (21) "

Figure 112014057460359-pat00021

&Quot; (22) "

Figure 112014057460359-pat00022

Subtracting the expression (20) from the expression (22) yields the expression (23).

&Quot; (23) "

Figure 112014057460359-pat00023

When the second plate 120 is moved in parallel by (x, y, z) in the above-described manner, the parallel movement value can be obtained from Equations (8) to (10).

Further, when the second plate 120 rotates, the rotation angles?,?, And? Can be obtained from Equations (13), (18), and (23).

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

10: sensor module 11: first plate
12: second plate 20: fiber sensor

Claims (11)

A first plate;
A second plate disposed to be spaced apart from the first plate by a predetermined distance in a vertical direction;
And a sensor module composed of a plurality of fiber sensors that are made of a piezoelectric fiber and a polymer and a conductive material mixed with each other and connect the first plate and the second plate,
Wherein the first plate and the second plate have a rectangular shape,
The plurality of fiber sensors may include four first fiber sensors for connecting the vertexes of the first plate and the vertexes of the second plate and four fiber sensors for connecting the vertexes of the first plate and the vertexes of the second plate, Second fiber sensors,
Dimensional strain measuring device using piezo- fiber, wherein strain is measured by measuring a change in relative position between the first plate and the second plate and a change in relative rotation angle of the fiber through the resistance change of the fiber sensors. delete The method according to claim 1,
Wherein the first plate and the second plate are square-shaped piezoelectric fibers. The method according to claim 1,
Wherein at least one of the first plate and the second plate comprises a plurality of unit cells. The method of claim 4,
Wherein the first plate and the second plate each comprise a different number of unit cells,
Wherein the unit cells of the first plate and the unit cells of the second plate are connected to the plurality of fiber sensors. The method according to claim 1,
The sensor module includes:
A three-dimensional strain measuring device using a piezoelectric fiber having a multi-layered structure in which a plurality of layers are stacked in a vertical direction. The method according to claim 1,
The sensor module includes:
A three-dimensional strain measuring device using a piezoelectric fiber having a matrix structure in which a plurality of pieces are arranged in a horizontal direction. The method according to claim 1,
Wherein the second plate is installed at a portion where strain measurement is required and the first plate is installed at a portion to be a reference for measuring a relative change of the second plate during strain measurement. The method according to claim 1,
A third plate disposed at a predetermined distance in the vertical direction so as to face the second plate,
Further comprising a plurality of additional fiber sensors that combine the polymer and the conductive material into a fiber form and connect the second plate and the third plate,
Wherein a relative positional change and a relative rotational angle change of the second plate with respect to the first plate are measured through a resistance change of the fiber sensors, Dimensional strain measurement device using piezoceramic fibers to measure the resistance of the additional fiber sensors. The method according to claim 1,
Wherein the conductive material comprises a carbon nanomaterial,
Wherein the fiber sensor is a three-dimensional strain measurement device using a piezoelectric fiber made of a composite fiber by mixing the polymer and the conductive material and using a melt spinning method. A structure having a three-dimensional strain measuring device using the piezoelectric fiber according to any one of claims 1 to 3.
KR1020140075047A 2014-06-19 2014-06-19 Three-dimensional strain sensor using piezo-fiber, and construction using the same KR101577801B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020140075047A KR101577801B1 (en) 2014-06-19 2014-06-19 Three-dimensional strain sensor using piezo-fiber, and construction using the same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020140075047A KR101577801B1 (en) 2014-06-19 2014-06-19 Three-dimensional strain sensor using piezo-fiber, and construction using the same

Publications (1)

Publication Number Publication Date
KR101577801B1 true KR101577801B1 (en) 2015-12-29

Family

ID=55085242

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020140075047A KR101577801B1 (en) 2014-06-19 2014-06-19 Three-dimensional strain sensor using piezo-fiber, and construction using the same

Country Status (1)

Country Link
KR (1) KR101577801B1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107576302A (en) * 2017-09-08 2018-01-12 中国地震局地壳应力研究所 A kind of spherical shell type three dimensional strain observation procedure

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20130125889A (en) * 2012-05-10 2013-11-20 한국표준과학연구원 Crabon nabotube composites having micro-pillar of vertical shape and method for manufacturing the same, tactile sensor with thereof
KR101353388B1 (en) * 2012-09-20 2014-01-21 국립대학법인 울산과학기술대학교 산학협력단 Strain measuring method using multiple electrode
KR20140038149A (en) * 2012-09-20 2014-03-28 국립대학법인 울산과학기술대학교 산학협력단 Structural health monitoring system of fiber reinforced composites including conductive nano-materials, the monitoring and the manufacturing method of the same, and structural health monitoring system of wind turbine blade including conductive nano-materials, the manufacturing method of the same
JP2014085306A (en) * 2012-10-26 2014-05-12 Shinshu Univ Flexible-contact type four-axle load measuring system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20130125889A (en) * 2012-05-10 2013-11-20 한국표준과학연구원 Crabon nabotube composites having micro-pillar of vertical shape and method for manufacturing the same, tactile sensor with thereof
KR101353388B1 (en) * 2012-09-20 2014-01-21 국립대학법인 울산과학기술대학교 산학협력단 Strain measuring method using multiple electrode
KR20140038149A (en) * 2012-09-20 2014-03-28 국립대학법인 울산과학기술대학교 산학협력단 Structural health monitoring system of fiber reinforced composites including conductive nano-materials, the monitoring and the manufacturing method of the same, and structural health monitoring system of wind turbine blade including conductive nano-materials, the manufacturing method of the same
JP2014085306A (en) * 2012-10-26 2014-05-12 Shinshu Univ Flexible-contact type four-axle load measuring system

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
미국등록특허 제8,250,927호

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107576302A (en) * 2017-09-08 2018-01-12 中国地震局地壳应力研究所 A kind of spherical shell type three dimensional strain observation procedure

Similar Documents

Publication Publication Date Title
Das et al. A review of some advanced sensors used for health diagnosis of civil engineering structures
Sebastian et al. Health monitoring of structural composites with embedded carbon nanotube coated glass fiber sensors
CN106276606A (en) Bridge crane HEALTH ONLINE based on fiber grating sensing technology monitoring system
KR101396202B1 (en) Structural health monitoring system of fiber reinforced composites including conductive nano-materials, the monitoring and the manufacturing method of the same, and structural health monitoring system of wind turbine blade including conductive nano-materials, the manufacturing method of the same
CN103940359B (en) Fiber grating differential strain gauge and manufacturing and using method thereof
Downey et al. Reconstruction of in-plane strain maps using hybrid dense sensor network composed of sensing skin
CN104344993A (en) Method for testing and measuring member bearing capacity and material performance parameters
Koecher et al. Piezoresistive in-situ strain sensing of composite laminate structures
CN110608837A (en) Small-range three-dimensional sensor and testing method thereof
US10012553B2 (en) Coated nanofiller/polymer composite sensor network for guided-wave-based structural health monitoring
KR20180102898A (en) A sensor and sensing method for separately detecting deformation and fracture sign prior to fracture and manufacturing method thereof
CN103575332B (en) Multi-dimensional and multidirectional stress-strain monitoring system
Haentzsche et al. Manufacturing technology of integrated textile-based sensor networks for in situ monitoring applications of composite wind turbine blades
KR101577801B1 (en) Three-dimensional strain sensor using piezo-fiber, and construction using the same
KR101353388B1 (en) Strain measuring method using multiple electrode
KR20180101038A (en) 3-dimensional strain sensor and manufacturing method of the same
CN108692668A (en) 3D shape detecting system based on optical fiber grating sensing and method
CN108181029A (en) The method of the multi-direction monitoring fibre reinforced composites strain of carbon nanometer paper sensor
JP2018112542A (en) Integrated hyper-redundant tactile sensor network based on structural fibers
CN106323587B (en) The monocular video high-precision measuring method of wing model in wind tunnel flexible deformation
CN110514131A (en) A kind of intelligence laminar fiber grating two-dimensional strain transducer
Dumstorff et al. Strain gauge printed on carbon weave for sensing in carbon fiber reinforced plastics
Qureshi et al. Multi-mode real-time strain monitoring in composites using low vacuum carbon fibers as a strain sensor under different loading conditions
CN109357795B (en) Cement-based piezoelectric composite material sensor
Hwang et al. Study on signal characteristic analysis of multi-axis load measurement sensors

Legal Events

Date Code Title Description
E701 Decision to grant or registration of patent right
GRNT Written decision to grant
FPAY Annual fee payment

Payment date: 20181001

Year of fee payment: 4