CN108036769A - A kind of distinguishable direction from temperature compensation fiber grating deviational survey sensor - Google Patents
A kind of distinguishable direction from temperature compensation fiber grating deviational survey sensor Download PDFInfo
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- CN108036769A CN108036769A CN201810025788.XA CN201810025788A CN108036769A CN 108036769 A CN108036769 A CN 108036769A CN 201810025788 A CN201810025788 A CN 201810025788A CN 108036769 A CN108036769 A CN 108036769A
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- 239000000835 fiber Substances 0.000 title claims abstract description 80
- 239000013307 optical fiber Substances 0.000 claims abstract description 17
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 8
- 239000010931 gold Substances 0.000 claims description 8
- 229910052737 gold Inorganic materials 0.000 claims description 8
- 239000002184 metal Substances 0.000 abstract description 24
- 229910052751 metal Inorganic materials 0.000 abstract description 24
- 238000005259 measurement Methods 0.000 abstract description 9
- 230000006698 induction Effects 0.000 description 11
- 230000008859 change Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- BGPVFRJUHWVFKM-UHFFFAOYSA-N N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] Chemical compound N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] BGPVFRJUHWVFKM-UHFFFAOYSA-N 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
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- 230000009471 action Effects 0.000 description 2
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- 230000005484 gravity Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C9/00—Measuring inclination, e.g. by clinometers, by levels
- G01C9/10—Measuring inclination, e.g. by clinometers, by levels by using rolling bodies, e.g. spheres, cylinders, mercury droplets
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C9/00—Measuring inclination, e.g. by clinometers, by levels
- G01C9/02—Details
- G01C9/06—Electric or photoelectric indication or reading means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C9/00—Measuring inclination, e.g. by clinometers, by levels
- G01C9/02—Details
- G01C9/06—Electric or photoelectric indication or reading means
- G01C2009/066—Electric or photoelectric indication or reading means optical
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C9/00—Measuring inclination, e.g. by clinometers, by levels
- G01C9/10—Measuring inclination, e.g. by clinometers, by levels by using rolling bodies, e.g. spheres, cylinders, mercury droplets
- G01C2009/107—Measuring inclination, e.g. by clinometers, by levels by using rolling bodies, e.g. spheres, cylinders, mercury droplets spheres
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- Length Measuring Devices By Optical Means (AREA)
Abstract
The invention discloses a kind of distinguishable direction from temperature compensation fiber grating deviational survey sensor, belong to technical field of optical fiber sensing, it includes strain transfer support base and equi intensity cantilever, the fixing end of equi intensity cantilever is arranged on strain transfer support base, and permanent magnet is equipped with the free end of equi intensity cantilever；On equi intensity cantilever surface, sensing element fiber grating is set；Dome-type shell is set in the underface of equi intensity cantilever, metal ball is set in dome-type shell.The present invention can not only realize the angle of bank measurement with self-temperature compensating, and can realize the identification of incline direction.
Description
Technical field
The invention belongs to technical field of optical fiber sensing, and in particular to a kind of distinguishable direction is passed from temperature compensation fiber grating deviational survey
Sensor.
Background technology
Traditional mechanical tilt meter drives mechanical arm indicators turn using gravity bob, and measurement accuracy is relatively low, it is necessary to arrive device
Position is installed and carries out digital independent, it is higher that probability occurs in human error.
In the prior art, all -fiber based on Bragg gratings measures dipmeter (CN103591937A) in real time, discloses one
Kind grating inclinometer, but it still can not achieve the measurement of incline direction.
The content of the invention
Goal of the invention：It is an object of the invention to provide a kind of distinguishable direction from temperature compensation fiber grating deviational survey sensor,
Not only size is small, light-weight, and electromagnetism interference, and durability is good.
Technical solution：For achieving the above object, the present invention adopts the following technical scheme that：
A kind of distinguishable direction is hanged from temperature compensation fiber grating deviational survey sensor, including strain transfer support base and equal strength
Arm beam, the fixing end of equi intensity cantilever is arranged on strain transfer support base, in the free end of the equi intensity cantilever
It is equipped with permanent magnet；On the equi intensity cantilever surface, sensing element fiber grating is set；In the equal strength cantilever
The underface of beam sets dome-type shell, and metal ball is set in the dome-type shell.
The equi intensity cantilever is hanged including the first equi intensity cantilever, the second equi intensity cantilever and the 3rd equal strength
Arm beam, the sensing element fiber grating include the first sensing element fiber grating, the second sensing element fiber grating, the 3rd
Sensing element fiber grating；The sensing element fiber grating includes the first sensing element fiber grating, the second sensing element
Fiber grating, the 3rd sensing element fiber grating are respectively placed in the first equi intensity cantilever, the second equi intensity cantilever, third
Intensity cantilever beam surface.
The first sensing element fiber grating, the second sensing element fiber grating, the 3rd sensing element fiber grating
Tail optical fiber is drawn by optical fiber pigtail fairlead, and the optical fiber pigtail fairlead is arranged on sensor protecting case.
The dome-type shell is fixed on sensor protecting case by the housing mount at both ends.
The strain transfer support base is connected by strain transfer fixing piece with sensor protecting case.
The strain transfer support base is regular triangular prism, and its bottom has section in inclination.
The strain transfer fixing piece is for rectangular-shape and with the internal thread hole for coordinating sensor protecting case to fix.
The dome-type enclosure material is the nonmetallic materials for having support strength.
Beneficial effect：Compared with prior art, the present invention is equipped with permanent magnet by the free end in equi intensity cantilever；
On equi intensity cantilever surface, sensing element fiber grating is set；In the underface of equi intensity cantilever, dome-type shell is set,
Metal ball is set in dome-type shell, can not only realize the angle of bank measurement with self-temperature compensating, and
It can realize the identification of incline direction.
Brief description of the drawings
Fig. 1 is the 3-D view from temperature compensation fiber grating deviational survey sensor in distinguishable direction；
Fig. 2 is strain transfer support component top view；
Fig. 3 is strain transfer support component side view；
Fig. 4 is the front view of strain transfer element；
Fig. 5 is inclination induction element top view；
Fig. 6 is inclination induction element side view
Fig. 7 is distinguishable direction from temperature compensation fiber grating deviational survey sensor testing principle original state schematic diagram；
Fig. 8 is distinguishable direction from temperature compensation fiber grating deviational survey sensor quadrants distribution schematic diagram.
Embodiment
The present invention is described further with specific implementation example below in conjunction with the accompanying drawings.
As shown in figures 1-8, reference numeral is as follows：Strain transfer support base 1, strain transfer fixing piece 2, optical fiber pigtail draw
Portal 3, permanent magnet 4, the first equi intensity cantilever 5, the second equi intensity cantilever 6, the 3rd equi intensity cantilever 7, first is sensitive
Element fiber grating 8, the second sensing element fiber grating 9, the 3rd sensing element fiber grating 10, dome-type shell 11, metal
Ball 12, housing mount 13, sensor protecting case 14, fixing screwed hole 15；Wherein, r1Represent the first equi intensity cantilever
The distance between 5 free ends and metal ball are worth, r2Represent between 6 free end of the second equi intensity cantilever and metal ball away from
From value, r3Represent the distance between 7 free end of the 3rd equi intensity cantilever and metal ball value, r11Represent r1In XOY plane
Component, r21Represent r2In the component of XOY plane, r31Represent r3In the component of XOY plane, α represents strain transfer support base bottom
Section inclination angle in portion.
A kind of distinguishable direction from temperature compensation fiber grating deviational survey sensor, including strain transfer support component, strain transfer
Element, tilt induction element, sensor protecting case 14 and some fixing screwed holes 15.Wherein, strain transfer support component bag
Strain transfer support base 1, strain transfer fixing piece 2 and optical fiber pigtail fairlead 3 is included to form；Strain transfer element includes
Permanent magnet 4, equi intensity cantilever, sensing element fiber grating；Tilting induction element includes dome-type shell 11, metal ball 12
And the housing mount 13 at both ends forms.
Strain transfer support base 1 is regular triangular prism, and its bottom has section in the inclination of α angles, which uses
In the fixation for realizing equi intensity cantilever fixing end；Strain transfer fixing piece 2 is rectangular-shape, and has internal thread hole, is used for
Realize the connection of strain transfer element and sensor protecting case 14；Optical fiber pigtail fairlead 3 removes and is used for realization fiber grating 10
Tail optical fiber is drawn and is realized outside optical signal transmission, is additionally operable to realize the sign of sensor center line axis, easy to the center sensor axis
It is parallel with ground vertical line when in use, simplify the initial rezero operation of sensor.
Strain transfer element is used for making the sensor have from temperature compensation characteristic；Permanent magnet 4 is used for building inclination induction element
12 position of metal ball changes the conversion with acting on equi intensity cantilever free end active force；Equi intensity cantilever is used for realizing
Conversion between its free end active force change and the drift of sensing element fiber bragg grating center wavelength；In sensing element fiber grating
Mandrel line is overlapped with equi intensity cantilever axis, is used as the Sensor core conversion element, its data of back analysis obtain
It is measured angle of inclination；Dome-type shell 11 is used for fixing movement locus scope under metal ball 12 acts at measured inclination angle
Restriction.
Metal ball 12 is used for realizing the conversion at measured angle of inclination and its locus；The housing mount 13 at both ends
For realizing the connection for tilting induction element and sensor protecting case 14；Fixing screwed hole 15 is easy to sensor application with being tested
Part is fixed；Dome-type shell 11 is used for realization the sensor internal element from being influenced by external environment, and can be
It is applied in engineering.
Strain transfer support base 1 is connected by strain transfer fixing piece 2 with sensor protecting case 14；Optical fiber pigtail draws
Portal and 3 realize the first sensing element fiber grating 8, the second sensing element fiber grating 9,10 tail of the 3rd sensing element fiber grating
Fine extraction；First equi intensity cantilever 5, the second equi intensity cantilever 6, the 3rd equi intensity cantilever 7 are supported with strain transfer
Pedestal 1 connects and composes its fixing end；4 and first equi intensity cantilever 5 of permanent magnet, the second equi intensity cantilever 6, the 3rd equal strength
7 free end of cantilever beam is connected；First sensing element fiber grating 8, the second sensing element fiber grating 9, the 3rd sensing element light
Fine grating 10 is respectively placed in the first equi intensity cantilever 5, the second equi intensity cantilever 6,7 surface of the 3rd equi intensity cantilever；Half
Ball-type shell 11 is connected by housing mount 13 with sensor protecting case 14；Metal ball 12 is placed in dome-type shell 11
It is interior；Fixing screwed hole 15 realizes the fixation during sensor application.
The course of work：1. sensor is connected by fixing screwed hole 15 with measurand or tested scene；2. work as sensor
It is subject to measured tilting action to be placed on metal ball 12 in dome-type shell 11 and be fixed on the first equal strength cantilever after fixation
Beam 5, the second equi intensity cantilever 6,7 free end of the 3rd equi intensity cantilever permanent magnet 4 between space length become
Change, and then cause the effect for acting on the first equi intensity cantilever 5, the second equi intensity cantilever 6, the 3rd equi intensity cantilever 7
Power changes；3. act on the first equi intensity cantilever 5, the second equi intensity cantilever 6, the work of the 3rd equi intensity cantilever 7
Its surface strain is firmly caused to change, so as to cause the first sensing element fiber grating 8, the second sensing element fiber grating
9th, the centre wavelength of the 3rd sensing element fiber grating 10 is drifted about；It is 4. sensitive first by first by optical fiber pigtail fairlead 3
Drift letter occurs for part fiber grating 8, the second sensing element fiber grating 9, the centre wavelength of the 3rd sensing element fiber grating 10
Breath is delivered to outside sensor；5. back analysis sensor exports the first sensing element fiber grating 8, the second sensing element optical fiber light
Grid 9, the centre wavelength generation drift information of the 3rd sensing element fiber grating 10 can must be measured inclined size and inclination side
To.
The sensing implement body detection process basic overview is as follows：
1) original state
To tilt origin structure rectangular coordinate system and sensing element optical fiber light carried out by induction element metal ball initial position
Grid 1 are located at YOZ planes, as shown in Figure 7.At this time, permanent magnet in induction element metal ball and three strain transfer elements is tilted
The distance between it is identical, amount of force is equal, direction is different, i.e., at this time act on three strain transfer element equi intensity cantilevers
Amount of force it is equal.
In formula, f1Expression acts on 1 free end active force of equi intensity cantilever, f2Expression acts on equi intensity cantilever 2 certainly
By end active force, f3Expression acts on 3 free end active force of equi intensity cantilever, r1Represent 1 free end of equi intensity cantilever and gold
Belong to the distance between ball value, r2Represent the distance between 2 free end of equi intensity cantilever and metal ball value, r3Expression etc. is strong
Spend the distance between 3 free end of cantilever beam and metal ball value, r1=r2=r3, between G (x) expression metal balls and permanent magnet
Active force and the functional relation between it between distance value.From electromagnetism philosophy, the spacing of metal ball and permanent magnet
Smaller from being worth, the value of G (x) is bigger.Since three strain transfer element moderate strength cantilever materials and geometric parameter are identical, then
Equi intensity cantilever surface strain is equal in magnitude, its value is represented by：
In formula, ε1Represent the surface strain of equi intensity cantilever 1, ε2Represent the surface strain of equi intensity cantilever 2, ε3Table
Show the surface strain of equi intensity cantilever 3, L is the length of equi intensity cantilever (1,2,3), and E is equi intensity cantilever (1,2,3)
The elasticity modulus of material, h are equi intensity cantilever (1,2,3) thickness, and W is equi intensity cantilever (1,2,3) fixing end width.Into
And the drift value that can obtain sensing element fiber bragg grating center wavelength is：
In formula, Δ λ1Represent 1 centre wavelength drift value of sensing element fiber grating, Δ λ2Represent sensing element fiber grating 2
Centre wavelength drift value, Δ λ3Represent 3 centre wavelength drift value of sensing element fiber grating, Δ T is the residing measurement ring of sensor
The change of border temperature, KεFor the sensitivity of grating strain, ξ is fiber grating thermo-optical coeffecient, and α is the thermal coefficient of expansion of optical fiber.Connection
Cube journey (1), (2), (3) can obtain：
Since the identical i.e. Δ T-phase of environment measured by sensor residing for three sensing element fiber gratings is same, and equal strength is hanged
The distance between arm beam (1,2,3) free end and metal ball value r1=r2=r3=r is equal, and analysis mode (4) can obtain, once should
Distinguishable direction from after determining temperature compensation fiber grating deviational survey sensor material and geometric parameter, r1Numerical value will be changed into known quantity, into
And it can must demodulate sensing element fiber grating signal delta λ1=Δ λ2=Δ λ3With the relation function between Δ T.At this time, by formula (4)
And sensing element fiber grating signal delta λ1=Δ λ2=Δ λ3The changing value of measuring environment temperature residing for sensor can be obtained.To sum up
The change Delta T of measuring environment temperature does not interfere with the measurement result of the sensor residing for the sensor, and if sensor guarantor
Hold original state it is constant in the case of by back analysis sensing element fiber grating signal delta λ1=Δ λ2=Δ λ3It can be sensed
The changing value of measuring environment temperature residing for device.
2) incline direction recognition detection
XOY is divided into four quadrants, as shown in Figure 8.When the distinguishable direction from temperature compensation fiber grating deviational survey sensor by
To under the measured tilting action in the external world, the locus for tilting induction element metal ball changes.
When measured inclination angle in the component of XOY plane in first quartile when, r1Increase, r2、r3Reduce.By G (x) functions
Characteristic can be obtained to be reduced relative to 1 active force of original state equi intensity cantilever, equi intensity cantilever 2, the increase of 3 active forces, and then
Δλ1Reduce, Δ λ2、Δλ3Increase.
When measured inclination angle in the component of XOY plane in the second quadrant when, r2Increase, r1、r3Reduce.By G (x) functions
Characteristic can be obtained to be reduced relative to 2 active force of original state equi intensity cantilever, equi intensity cantilever 1, the increase of 3 active forces, and then
Δλ2Reduce, Δ λ1、Δλ3Increase.
When measured inclination angle in the component of XOY plane in third quadrant when, r1、r3Increase, r2Reduce.By G (x) functions
Characteristic can be obtained to be reduced relative to original state equi intensity cantilever 1,3 active forces, the increase of 2 active force of equi intensity cantilever, and then
Δλ1、Δλ3Reduce, Δ λ2Increase.
When measured inclination angle in the component of XOY plane in fourth quadrant when, r2Increase, r1、r3Reduce.By G (x) functions
Characteristic can be obtained to be reduced relative to 2 active force of original state equi intensity cantilever, equi intensity cantilever 1, the increase of 3 active forces, and then
Δλ2Reduce, Δ λ1、Δλ3Increase.
To sum up analysis can obtain, Δ λ1、Δλ2、Δλ3Relative to its numerical value increase reduction trend and inclination angle during original state
One-to-one relation is presented in the distribution quadrant spent in XOY plane.Therefore, according to Δ λ1、Δλ2、Δλ3Relative to original state
When its numerical value increase reduction trend can obtain distribution quadrant of the measured angle of inclination in XOY plane, and then be tilted in
The incline direction of XOY plane.In short, there should be the characteristic that can distinguish incline direction from temperature compensation fiber grating deviational survey sensor.
3) tilt detection
Fettered due to tilting induction element metal ball by its dome-type shell, be β when the external world is measured angle of inclination, this
When it in XOY plane component is θ relative to the anticlockwise angle of OX directions, metal ball is in rectangular coordinate system at this time
Coordinate value (xGold,yGold,zGold) be：
(xGold,yGold,zGold)=(Rsin β cos θ, Rsin β sin θs, R-Rcos β) (5)
In formula, R represents the radius value for tilting induction element dome-type shell.And then metal ball and equal strength cantilever can be obtained
1,2, the distance between 3 value r of beam1、r2、r3It is represented by：
Bringing formula (6) into formula (4) can obtain：
Sensitive member is obtained by being analyzed from temperature compensation fiber grating deviational survey sensor output signal demodulation the distinguishable direction
The drift delta λ of 1,2,3 centre wavelength of part fiber grating1、Δλ2、Δλ3And carry it into formula (7) solve can obtain inclination angle beta,
XOY plane angle theta and measured variation of ambient temperature amount Δ T.
Summarizing above-mentioned analysis can obtain：The distinguishable direction can realize sensor institute from temperature compensation fiber grating deviational survey sensor
Locate variation of ambient temperature amount Δ T, be measured inclination angle beta and its in XOY plane component relative to OX directions side counterclockwise
To angle theta measurement.And then there is no influence i.e. should on its measurement result by the sensor local environment temperature variation Δ T
Sensor has the characteristic of temperature self-compensation.
In short, the inclination angle that distinguishable direction can be not only realized from temperature compensation fiber grating deviational survey sensor in the distinguishable direction
Degree measurement, and with the characteristic from temperature compensation.
Claims (7)
1. a kind of distinguishable direction from temperature compensation fiber grating deviational survey sensor, it is characterised in that：Including strain transfer support base
(1) and equi intensity cantilever, the fixing end of equi intensity cantilever is arranged on strain transfer support base (1), strong in the grade
The free end of degree cantilever beam is equipped with permanent magnet (4)；On the equi intensity cantilever surface, sensing element fiber grating is set；
Dome-type shell (11) is set in the underface of the equi intensity cantilever, gold is set in the dome-type shell (11)
Belong to ball (12).
2. a kind of distinguishable direction according to claim 1 from temperature compensation fiber grating deviational survey sensor, it is characterised in that：Institute
The equi intensity cantilever stated includes the first equi intensity cantilever (5), the second equi intensity cantilever (6) and the 3rd equi intensity cantilever
(7), the sensing element fiber grating includes the first sensing element fiber grating (8), the second sensing element fiber grating
(9), the 3rd sensing element fiber grating (10)；The sensing element fiber grating includes the first sensing element fiber grating
(8), the second sensing element fiber grating (9), the 3rd sensing element fiber grating (10) are respectively placed in the first equi intensity cantilever
(5), the second equi intensity cantilever (6), the surface of the 3rd equi intensity cantilever (7).
3. a kind of distinguishable direction according to claim 2 from temperature compensation fiber grating deviational survey sensor, it is characterised in that：Institute
The first sensing element fiber grating (8), the second sensing element fiber grating (9), the 3rd sensing element fiber grating (10) stated
Tail optical fiber is drawn by optical fiber pigtail fairlead (3), and the optical fiber pigtail fairlead (3) is arranged on sensor protecting case (14)
On.
4. a kind of distinguishable direction according to claim 1 from temperature compensation fiber grating deviational survey sensor, it is characterised in that：Institute
The dome-type shell (11) stated is fixed on sensor protecting case (14) by the housing mount (13) at both ends.
5. a kind of distinguishable direction according to claim 1 from temperature compensation fiber grating deviational survey sensor, it is characterised in that：Institute
The strain transfer support base (1) stated is connected by strain transfer fixing piece (2) with sensor protecting case (14).
6. a kind of distinguishable direction according to claim 5 from temperature compensation fiber grating deviational survey sensor, it is characterised in that：Institute
The strain transfer support base (1) stated is regular triangular prism, and its bottom has section in inclination.
7. a kind of distinguishable direction according to claim 5 from temperature compensation fiber grating deviational survey sensor, it is characterised in that：Institute
The strain transfer fixing piece (2) stated is for rectangular-shape and with the internal thread hole for coordinating sensor protecting case (14) to fix.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810025788.XA CN108036769B (en) | 2018-01-11 | 2018-01-11 | Self-temperature-compensation fiber bragg grating three-dimensional inclinometry sensor capable of distinguishing direction |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810025788.XA CN108036769B (en) | 2018-01-11 | 2018-01-11 | Self-temperature-compensation fiber bragg grating three-dimensional inclinometry sensor capable of distinguishing direction |
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| Publication Number | Publication Date |
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| CN108036769A true CN108036769A (en) | 2018-05-15 |
| CN108036769B CN108036769B (en) | 2024-09-20 |
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Cited By (3)
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| CN108151706A (en) * | 2017-12-26 | 2018-06-12 | 北京金风科创风电设备有限公司 | Dip angle information measuring device |
| CN108917656A (en) * | 2018-07-24 | 2018-11-30 | 蚌埠学院 | A kind of Multi-Axis Fiber Bragg Gratings inclination sensor |
| CN117722957A (en) * | 2023-11-22 | 2024-03-19 | 广州市南沙区北科光子感知技术研究院 | Magnetic grating type fiber bragg grating wide-range displacement sensor |
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