CN109764975A - A kind of clipping Fiber Bragg Grating Temperature sensor and its application method - Google Patents
A kind of clipping Fiber Bragg Grating Temperature sensor and its application method Download PDFInfo
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- CN109764975A CN109764975A CN201910029738.3A CN201910029738A CN109764975A CN 109764975 A CN109764975 A CN 109764975A CN 201910029738 A CN201910029738 A CN 201910029738A CN 109764975 A CN109764975 A CN 109764975A
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- clamp arm
- fiber bragg
- optical fiber
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- bottom plate
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- 238000000034 method Methods 0.000 title claims abstract description 11
- 239000013307 optical fiber Substances 0.000 claims abstract description 43
- 244000309464 bull Species 0.000 claims abstract description 18
- 238000005259 measurement Methods 0.000 claims abstract description 11
- 230000006835 compression Effects 0.000 claims abstract description 4
- 238000007906 compression Methods 0.000 claims abstract description 4
- 239000000835 fiber Substances 0.000 claims description 14
- 238000005452 bending Methods 0.000 claims description 3
- 210000000481 breast Anatomy 0.000 claims description 3
- 238000003780 insertion Methods 0.000 claims description 3
- 230000037431 insertion Effects 0.000 claims description 3
- 238000009529 body temperature measurement Methods 0.000 abstract description 5
- 229920001343 polytetrafluoroethylene Polymers 0.000 abstract description 4
- 239000004810 polytetrafluoroethylene Substances 0.000 abstract description 4
- -1 polytetrafluoroethylene Polymers 0.000 abstract description 2
- 230000003287 optical effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000002360 explosive Substances 0.000 description 2
- 239000000382 optic material Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 150000001336 alkenes Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000005350 fused silica glass Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000005619 thermoelectricity Effects 0.000 description 1
- 230000004304 visual acuity Effects 0.000 description 1
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- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
The present invention relates to a kind of clipping Fiber Bragg Grating Temperature sensor and its application methods, belong to technical field of electronic measurement.The present invention includes adjustment bull stick, screw rod, fixed block, bottom plate, control block, clamp arm, gasket, polyfluortetraethylene plate, optical fiber Bragg raster, export optical fiber；Wherein fixed block is fixed on bottom plate, clamp arm upper end connecting bottom board, screw rod upper end is with adjustment bull stick, lower end link control module, screw rod pass through fixed block, two clamp arm in control block connection left and right, clamp arm side is equipped with resistance to compression, high temperature-resistant gasket, the other side is polyfluortetraethylene plate, and optical fiber Bragg raster is encapsulated in polytetrafluoroethylene (PTFE) intralamellar part, and export optical fiber is drawn along top.According to the relational expression Δ λ of the temperature of the shift value of the central wavelength of optical fiber Bragg raster and measured objectB=KTΔ T calculates measured object temperature.The present invention is suitable for press from both sides the temperature measurement of addendum body, and structure is simple, is easily installed and dismantles, strong antijamming capability.
Description
Technical field
The present invention relates to a kind of clipping Fiber Bragg Grating Temperature sensor and its application methods, belong to photoelectron survey
Measure technical field.
Background technique
In recent years, the advantages such as fibre optical sensor, at low cost and strong antijamming capability high with its precision are widely used in
Field of measuring technique.Temperature is a common measure the item, and temperature measuring tool common at present has mercury thermometer, thermoelectricity
Even, infrared temperature sensor and fibre optical sensor etc., comparatively, fibre optic temperature sensor is in range, accuracy, anti-interference
Ability, electrical isolation, anticorrosive etc. have apparent comprehensive advantage, especially reply to measure ring in strong electromagnetic, inflammable, explosive etc.
When border, Fiber Bragg Grating Temperature sensor uses fiber optic materials, is to use optical signal in the transmission and sensing of signal,
Realize scene without electrical measurement, provide a kind of mode of the on-line measurement temperature of essential safety.Use optical fiber Bragg raster
Temperature sensor fix when temperature measurement frequently with flush type, adhesive type, screw, artificial mounting means such as fixed, and this
A little modes are not high for the practicability of the testees such as wall-like, tubulose, convex, small size, provisional measurement.
Summary of the invention
The technical problem to be solved in the present invention is to provide one kind can press from both sides the clipping fiber Bragg light being attached on testee
Grid temperature sensor and its application method, the temperature measurement for the testees such as wall-like, tubulose, convex, small size or environment mention
A kind of more convenient temp measuring method is supplied.
The technical solution adopted by the present invention is that: a kind of clipping Fiber Bragg Grating Temperature sensor, including adjustment bull stick
1, screw rod 2, fixed block 3, bottom plate 4, control block 5, clamp arm 6, gasket 7, polyfluortetraethylene plate 8, optical fiber Bragg raster 9, export light
Fibre 10；Wherein fixed block 3 is fixed on bottom plate 4,6 upper end connecting bottom board 4 of clamp arm, and 2 upper end of screw rod is connected with adjustment bull stick 1, under
End is connect after passing through fixed block 3, bottom plate 4 from top to bottom with 5 top of control block, and 5 both ends of control block are equipped with boss obliquely, folder
Jack is equipped in the middle part of arm 6, two boss of control block 5 can be slidably inserted into the jack of two clamp arm 6 in left and right, and the one of clamp arm 6
Side is equipped with boss, and a medial surface of bottom plate 4 is equipped with groove, and the boss of clamp arm 6 can be slidably mounted in the groove of bottom plate 4, left and right
Two clamp arm 6 slide up and down while moving up and down with control block 5 along bottom plate 4, the lower end inside face of left clamp arm 6 equipped with resistance to compression,
The lower end inside face of high temperature-resistant gasket 7, right clamp arm 6 is equipped with polyfluortetraethylene plate 8, and optical fiber Bragg raster 9 is encapsulated in polytetrafluoroethyl-ne
Inside alkene plate 8, optical fiber Bragg raster 9 draws export optical fiber 10 along top.
Specifically, the medial surface of the bottom plate 4 is in inversed W-shape, when control block 5 is located at top, two boss of control block 5
The bosom of two 6 jacks of clamp arm in insertion left and right, the upper end of left and right clamp arm 6 are close with the bending part of the inner sidewall of bottom plate 4 respectively
Contact, control block 5 move up, and two clamp arm 6 in left and right will collapse upwards, and control block 5 moves down, two clamp arm 6 in left and right
It will expand downwards.
Further, the fixed block 3, the threaded hole to match with screw rod 2 is equipped in the middle part of bottom plate 4.
A kind of application method of the clipping Fiber Bragg Grating Temperature sensor, the specific steps are as follows:
Step1, rotation adjustment bull stick 1, adjust 6 spacing of clamp arm by moving up and down for control block 5, are located at measured object
6 inside of clamp arm, rotation adjustment bull stick 1, makes clamp arm 6 clamp measured object；
Step2, it is monitored by wire jumper by 10 incoming fiber optic grating demodulation instrument of optical fiber is exported；
Step3, the shift value Δ λ according to the central wavelength of optical fiber Bragg raster 9BWith the relational expression of the temperature of measured object
ΔλB=KTΔ T calculates the temperature change of measured object；In formula: KTFor the temperature coefficient of sensor, Δ T is the temperature of measured object
Spend variable quantity；
After Step4, measurement, wire jumper is disconnected, rotation adjustment bull stick 1 opens clamp arm 2, removes sensor.
The beneficial effects of the present invention are:
1, this sensor uses clipping structure, more for the testees such as wall-like, tubulose, convex, small size or environment
Has measurement advantage.
2, the optical fiber Bragg raster that this sensor uses has very strong corrosion resistance and anti-electromagnetic interference capability
(EMI)。
3, this sensor itself is without any electric signal, the temperature being applicable in the high-risk environments such as strong electromagnetic, inflammable, explosive
Degree measurement.
4, structure is simple, is easily installed and dismantles.
Detailed description of the invention
Fig. 1 is the structural diagram of the present invention；
Fig. 2 is expansion structure schematic diagram of the invention；
Fig. 3 is the A-A cross-sectional view in Fig. 2.
Each label in figure: 1 it is bull stick, 2 is screw rod, 3 is fixed block, 4 is bottom plate, 5 is control block, 6 is clamp arm, 7 is pad
Piece, 8 be polyfluortetraethylene plate, 9 be optical fiber Bragg raster, 10 be export optical fiber.
Specific embodiment
In the following with reference to the drawings and specific embodiments, the present invention is described further.
Embodiment 1: as shown in Figure 1-3, a kind of clipping Fiber Bragg Grating Temperature sensor, including adjustment bull stick 1,
Screw rod 2, fixed block 3, bottom plate 4, control block 5, clamp arm 6, gasket 7, polyfluortetraethylene plate 8, optical fiber Bragg raster 9, export optical fiber
10；Wherein fixed block 3 is fixed on bottom plate 4,6 upper end connecting bottom board 4 of clamp arm, and 2 upper end of screw rod is connected with adjustment bull stick 1, lower end
It is connect after passing through fixed block 3, bottom plate 4 from top to bottom with 5 top of control block, 5 both ends of control block are equipped with boss obliquely, clamp arm
6 middle parts are equipped with jack, and two boss of control block 5 can be slidably inserted into the jack of two clamp arm 6 in left and right, and the side of clamp arm 6
Equipped with boss, a medial surface of bottom plate 4 is equipped with groove, and the boss of clamp arm 6 can be slidably mounted in the groove of bottom plate 4, left and right two
A clamp arm 6 slides up and down while moving up and down with control block 5 along bottom plate 4, and the lower end inside face of left clamp arm 6 is equipped with resistance to compression, resists
The lower end inside face of high-temperature gasket 7, right clamp arm 6 is equipped with polyfluortetraethylene plate 8, and optical fiber Bragg raster 9 is encapsulated in polytetrafluoroethylene (PTFE)
Inside plate 8, optical fiber Bragg raster 9 draws export optical fiber 10 along top.
Further, the medial surface of the bottom plate 4 is in inversed W-shape, and when control block 5 is located at top, two of control block 5 are convex
The bosom of two 6 jacks of clamp arm in platform insertion left and right, the upper end of left and right clamp arm 6 are tight with the bending part of the inner sidewall of bottom plate 4 respectively
Contiguity touching, control block 5 move up, and two clamp arm 6 in left and right will collapse upwards, and control block 5 moves down, two clamp arm in left and right
6 will expand downwards, and two clamp arm 6 clamp measured objects when being achieved in installation or so, and two clamp arm 6 are opened and quilt when disassembly or so
Survey object separation.
Further, the fixed block 3, the threaded hole to match with screw rod 2 is equipped in the middle part of bottom plate 4.
A kind of application method of the clipping Fiber Bragg Grating Temperature sensor, the specific steps are as follows:
Step1, rotation adjustment bull stick 1, adjust 6 spacing of clamp arm by moving up and down for control block 5, are located at measured object
6 inside of clamp arm, rotation adjustment bull stick 1, makes clamp arm 6 clamp measured object；
Step2, it is monitored by wire jumper by 10 incoming fiber optic grating demodulation instrument of optical fiber is exported；
Step3, the shift value Δ λ according to the central wavelength of optical fiber Bragg raster 9BWith the relational expression of the temperature of measured object
ΔλB=KTΔ T calculates the temperature change of measured object；In formula: KTFor the temperature coefficient of sensor, Δ T is the temperature of measured object
Spend variable quantity；
After Step4, measurement, wire jumper is disconnected, rotation adjustment bull stick 1 opens clamp arm 2, removes sensor.
The working principle of the invention is:
It referring to attached drawing 1, is encapsulated in due to optical fiber Bragg raster in hollow polyfluortetraethylene plate, so fiber Bragg light
Grid are only temperature sensitive, insensitive to additional ess-strain.Therefore, the central wavelength lambda of the optical fiber Bragg rasterBDisplacement only with
Temperature change is related.
Optical fiber grating sensing characteristic are as follows:
λB=2neffΛ (1)
The bragg wavelength of optical fiber Bragg raster is with effective refractive index neffChange with grating period A and change, because
This Bragg wavelength is extremely sensitive for extraneous stress strain, thermic load etc..
When no applied stress acts on, when only change in temperature Δ T, the week of the optical fiber Bragg raster as caused by thermal expansion effects
The changes delta λ of phaseBAre as follows:
ΔλB=α λB·ΔT (2)
In formula, α is the thermal expansion coefficient of fiber optic materials.
The changes delta n of the effective refractive index as caused by thermo-optic effecteffAre as follows:
Δneff=ξ neff·ΔT (3)
In formula, ξ is the thermo-optical coeffecient of optical fiber, indicates refractive index variation with temperature rate.
It is obtained by formula (1), the changes delta λ in the optical fiber Bragg raster period as caused by thermo-optic effectBAre as follows:
In formula, ξ is the thermo-optical coeffecient of optical fiber, indicates refractive index variation with temperature rate
It is obtained by formula (2), formula (4), under the action of eliminating applied stress strain, Fiber Bragg Grating Temperature sensor cloth
The relationship of the variation of glug wavelength and temperature are as follows:
For fused quartz optical fiber, general α=0.55 × 10-6/ DEG C, ξ=6.67 × 10-6/℃。
ΔλB=(α+ξ) λBΔ T=KT·ΔT (6)
In formula, KTFor the temperature coefficient of optical fiber Bragg raster, actual value is subject to temperature calibration.
Above formula shows after eliminating applied stress effects of strain, the Bragg wavelength-shift of fiber grating and the variation of temperature
It is in a linear relationship.Thus the measurement of temperature is realized.
Its design parameter are as follows:
1, the technical parameter of optical fiber Bragg raster 9 are as follows: central wavelength lambdaB=1550nm；
2, by the configuration experiment of attached drawing 2；
3, the shift value Δ λ of the central wavelength of optical fiber Bragg raster 9 is obtained with fiber Bragg grating (FBG) demodulatorB；
4, according to the shift value Δ λ of the central wavelength of optical fiber Bragg raster 9BWith the relational expression Δ λ of the temperature of measured objectB=
KTΔ T calculates the temperature change of measured object；In formula: KTFor the temperature coefficient of sensor, Δ T is that the temperature of test environment becomes
Change amount.
5, the calculated results show that this is clipping when the initial Bragg wavelength of optical fiber Bragg raster is 1550nm
Fiber Bragg Grating Temperature sensor system sensitivity is KT=10.74pm/ DEG C；
6, (refer to Δ λ when the wavelength discrimination of optical fiber Bragg raster (FBG) demodulator is 1pmBWhen every variation 1pm), the sensing
The temperature resolving power of device are as follows: 0.093 DEG C, temperature measurement range are as follows: -20 DEG C -120 DEG C.
Sensor of the invention structure is simple, is easily installed and dismantles, is at low cost, is small in size, suitable for that can press from both sides attached wall
The measurement of the temperature of the objects such as shape, tubulose, convex, small size or environment, temperature measurement range are -20 DEG C -120 DEG C.
Above in conjunction with attached drawing, the embodiment of the present invention is explained in detail, but the present invention is not limited to above-mentioned
Embodiment within the knowledge of a person skilled in the art can also be before not departing from present inventive concept
Put that various changes can be made.
Claims (4)
1. a kind of clipping Fiber Bragg Grating Temperature sensor, it is characterised in that: including adjustment bull stick (1), screw rod (2), consolidate
Determine block (3), bottom plate (4), control block (5), clamp arm (6), gasket (7), polyfluortetraethylene plate (8), optical fiber Bragg raster (9), lead
Optical fiber (10) out；Wherein fixed block (3) is fixed on bottom plate (4), clamp arm (6) upper end connecting bottom board (4), and screw rod (2) upper end connects
It is connected to adjustment bull stick (1), lower end passes through fixed block (3), bottom plate (4) from top to bottom and connect afterwards with control block (5) top, control block
(5) both ends are equipped with boss obliquely, and jack is equipped in the middle part of clamp arm (6), and two boss of control block (5) can be slidably inserted into left and right
In the jack of two clamp arm (6), and the side of clamp arm (6) is equipped with boss, and a medial surface of bottom plate (4) is equipped with groove, clamp arm (6)
Boss can be slidably mounted in the groove of bottom plate (4), two clamp arm (6) in left and right edge while moved up and down with control block (5)
Bottom plate (4) slides up and down, and the lower end inside face of left clamp arm (6) is equipped with resistance to compression, high temperature-resistant gasket (7), in the lower end of right clamp arm (6)
Side is equipped with polyfluortetraethylene plate (8), and optical fiber Bragg raster (9) is encapsulated in polyfluortetraethylene plate (8) inside, fiber Bragg light
Grid (9) draw export optical fiber (10) along top.
2. clipping Fiber Bragg Grating Temperature sensor according to claim 1, it is characterised in that: the bottom plate (4)
Medial surface be in inversed W-shape, when control block (5) is located at top, the insertion of two boss of control block (5) controls two clamp arm (6)
The bosom of jack, the upper end of left and right clamp arm (6) are in close contact with the bending part of the inner sidewall of bottom plate (4) respectively, control block (5)
It moves up, two clamp arm (6) in left and right will collapse upwards, and control block (5) moves down, and two clamp arm (6) in left and right will be downward
Expansion.
3. clipping Fiber Bragg Grating Temperature sensor according to claim 1, it is characterised in that: the fixed block
(3), the threaded hole to match with screw rod (2) is equipped in the middle part of bottom plate (4).
4. a kind of application method of the described in any item clipping Fiber Bragg Grating Temperature sensors of claim 1-3, special
Sign is: specific step is as follows:
Step1, rotation adjustment bull stick (1) adjust clamp arm (6) spacing by moving up and down for control block (5), make tested level
On the inside of clamp arm (6), rotation adjustment bull stick (1) makes clamp arm (6) to clamp measured object；
Step2, export optical fiber (10) incoming fiber optic grating demodulation instrument is monitored by wire jumper；
Step3, the shift value Δ λ according to the central wavelength of optical fiber Bragg raster (9)BWith the relational expression Δ λ of the temperature of measured objectB
=KTΔ T calculates the temperature change of measured object；In formula: KTFor the temperature coefficient of sensor, Δ T is that the temperature of measured object becomes
Change amount；
After Step4, measurement, wire jumper is disconnected, rotation adjustment bull stick (1) opens clamp arm (2), removes sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910029738.3A CN109764975B (en) | 2019-01-14 | 2019-01-14 | Clamping type optical fiber Bragg grating temperature sensor and using method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910029738.3A CN109764975B (en) | 2019-01-14 | 2019-01-14 | Clamping type optical fiber Bragg grating temperature sensor and using method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109764975A true CN109764975A (en) | 2019-05-17 |
| CN109764975B CN109764975B (en) | 2020-10-20 |
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|---|---|---|---|
| CN201910029738.3A Expired - Fee Related CN109764975B (en) | 2019-01-14 | 2019-01-14 | Clamping type optical fiber Bragg grating temperature sensor and using method thereof |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4008562A (en) * | 1974-06-18 | 1977-02-22 | Vyzkumny Ustav Bavlnarsky | Apparatus for supplying a staple fiber formation to a fiber separating device of an open-end spinning unit |
| CN203811295U (en) * | 2014-05-21 | 2014-09-03 | 三峡大学 | Optical fiber temperature alarm threshold value actuator based on shape memory alloy |
| CN106940463A (en) * | 2017-05-16 | 2017-07-11 | 苏州专创光电科技有限公司 | A kind of joints of optical fibre rotating and clamping device |
| CN206724980U (en) * | 2016-11-23 | 2017-12-08 | 国家电网公司 | The adjustable clamping of boiler pipe detection sensor and multi-faceted regulation fixing apparatus |
| US20180059144A1 (en) * | 2012-07-19 | 2018-03-01 | Gridview Optical Solutions, Llc. | Electro-optic current sensor with high dynamic range and accuracy |
| CN209828236U (en) * | 2019-04-17 | 2019-12-24 | 广东高乐股份有限公司 | Stay cord formula clamping jaw |
-
2019
- 2019-01-14 CN CN201910029738.3A patent/CN109764975B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4008562A (en) * | 1974-06-18 | 1977-02-22 | Vyzkumny Ustav Bavlnarsky | Apparatus for supplying a staple fiber formation to a fiber separating device of an open-end spinning unit |
| US20180059144A1 (en) * | 2012-07-19 | 2018-03-01 | Gridview Optical Solutions, Llc. | Electro-optic current sensor with high dynamic range and accuracy |
| CN203811295U (en) * | 2014-05-21 | 2014-09-03 | 三峡大学 | Optical fiber temperature alarm threshold value actuator based on shape memory alloy |
| CN206724980U (en) * | 2016-11-23 | 2017-12-08 | 国家电网公司 | The adjustable clamping of boiler pipe detection sensor and multi-faceted regulation fixing apparatus |
| CN106940463A (en) * | 2017-05-16 | 2017-07-11 | 苏州专创光电科技有限公司 | A kind of joints of optical fibre rotating and clamping device |
| CN209828236U (en) * | 2019-04-17 | 2019-12-24 | 广东高乐股份有限公司 | Stay cord formula clamping jaw |
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| CN109764975B (en) | 2020-10-20 |
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