CN107917674A - FP and II type FBG compound sensors for high temperature strain measurement - Google Patents
FP and II type FBG compound sensors for high temperature strain measurement Download PDFInfo
- Publication number
- CN107917674A CN107917674A CN201711419407.8A CN201711419407A CN107917674A CN 107917674 A CN107917674 A CN 107917674A CN 201711419407 A CN201711419407 A CN 201711419407A CN 107917674 A CN107917674 A CN 107917674A
- Authority
- CN
- China
- Prior art keywords
- fbg
- optical fiber
- strain measurement
- mrow
- high temperature
- Prior art date
- Legal status (The legal status 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 status listed.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Length Measuring Devices By Optical Means (AREA)
- Optical Transform (AREA)
Abstract
The invention discloses a kind of FP for high temperature strain measurement and II type FBG compound sensors, including the first FBG optical fiber, the second optical fiber, pure quartz capillary, ceramic glue.The present invention is effectively encapsulated II type FBG sensor and FP sensors using ceramic glue, the II type FBG sensor is used for temperature survey, FP sensors are used for temperature and strain measurement, by the spectral information that is demodulated in spectrometer, it can be achieved that the separation of temperature and strain.The optical fiber and ceramic glue used in the method can work in hot environment, it can be achieved that temperature and strain measurement under 1000 degree of high temperature.
Description
Technical field
The present invention relates to sensory field of optic fibre, and in particular to a kind of FP for high temperature strain measurement and II type FBG are compound
Sensor.
Background technology
Strain, refers to material under the effect of the factor such as external force and non-uniform temperature field, the degree being deformed.High-temp strain
Measurement, refers to the strain measurement carried out to measurand of the operating temperature higher than 500 DEG C, such as to the aircraft engine under working status
The strain measurement that machine, nuclear power engine, supercritical generator carry out.
Strain electric measuring system based on resistance strain gage, under the temperature environment higher than 500 DEG C, by electromagnetic interference
Afterwards, the measuring stability of resistance strain gage is poor, and survival rate is relatively low, and the resistance value of resistance strain gage be affected by temperature compared with
Greatly.
In technical field of optical fiber measurement, wideband light source is the necessary component of optical measuring system.It is identical in other conditions
In the case of, the broadband incident light of wideband light source generation, spectral region is wider, the measurement accuracy higher of optical measuring system, measurement
As a result it is more accurate.
Therefore, incident light improvement is carried out to the strain light measuring system based on optical fiber Fabry-Perot sensor, is optical fiber measurement technology
It is expected the technical problem solved in field.
The content of the invention
The present invention provides a kind of FP and II type FBG compound sensors for high temperature strain measurement, can realize high temperature ring
The measurement of temperature strain in border.
Technical scheme：A kind of FP and II type FBG compound sensors for high temperature strain measurement, wherein described
Compound sensor includes, the first FBG optical fiber, the second optical fiber, pure quartz capillary, ceramic glue；
The production method of the compound sensor comprises the following steps：
1) the first FBG fiber gratings of inscription are penetrated into pure quartz capillary；
2) optical fiber will be cut away at the position of the first FBG grid regions 5mm, and the first FBG is fixed on quartzy capillary
Pipe center；
3) the second smooth optical fiber of one section of end face is penetrated to the other side of quartz capillary, with the first FBG ends optical fiber shape
Into FP compound sensors；
4) observe the reflectance spectrum of the FP compound sensors by high temperature strain measurement system, the first FBG optical fiber of adjustment and
Second fiber position is to optimal location；
5) ceramic glue is coated in the first FBG optical fiber, the second optical fiber and quartz capillary, and is cured.
Preferably, the step of ceramic glue described in step 5) cures includes：After when normal temperature cure 10 is small, 93.3 DEG C cure 3
Hour, when 121.1 DEG C of curings 3 are small.
Preferably, the high temperature strain measurement system described in step 4) includes sequentially connected wideband light source, circulator, and FP is multiple
Close sensor, spectrometer.
Preferably, the first FBG optical fiber is incident optical, and second optical fiber is mirror based fiber optica.
Preferably, the first FBG fiber gratings are inscribed by infrared femtosecond laser.
For compound sensor in high temperature strain measurement, temperature variation and thermal stress meet following formula：
When carrying out temperature survey, the temperature change that fiber grating is measured is：
Wherein Δ λBThe center wavelength variation amount demodulated for (FBG) demodulator, α are the thermal coefficient of expansion of the first FBG, and ξ is hot light
Coefficient, λBFor Prague centre wavelength of the first FBG；
When carrying out strain measurement, wherein：
The thermal strain ε of measured objectthermal=αobject×ΔT (2)
Wherein αobjectFor the thermal coefficient of expansion of measured object, Δ T is the temperature change measured by the first FBG.
Beneficial effects of the present invention；The present invention provides a kind of FP and II type FBG composite sensings for high temperature strain measurement
Device, II type FBG sensor and FP sensors are effectively encapsulated, can be achieved at the same time by using ceramic glue under hot environment
Temperature survey and strain measurement.II type FBG sensor is used for temperature survey in the encapsulating structure, and FP sensors are used for temperature
And strain measurement, by the spectral information that is demodulated in spectrometer, it can be achieved that the separation of temperature and strain.Used in the method
Optical fiber and ceramic glue can work in hot environment, it can be achieved that temperature and strain measurement under 1000 degree of high temperature.
It should be appreciated that foregoing description substantially and follow-up description in detail are exemplary illustration and explanation, should not
As the limitation to the claimed content of the present invention.
Brief description of the drawings
With reference to the attached drawing enclosed, the present invention more purpose, function and advantages will pass through the as follows of embodiment of the present invention
Description is illustrated, wherein：
Fig. 1 schematically shows the structure diagram of compound sensor of the present invention；
Fig. 2 schematically shows the spectral schematic after compound sensor encapsulation of the present invention；
Fig. 3 schematically shows the curve map of the first FBG centre wavelengths and temperature change of the invention；
Fig. 4 schematically shows compound sensor reflectance spectrum of the present invention and the curve map of temperature change.
Embodiment
By reference to one exemplary embodiment, the purpose of the present invention and function and the side for being used for realization these purposes and function
Method will be illustrated.However, the present invention is not limited to one exemplary embodiment as disclosed below；Can by multi-form come
It is realized.The essence of specification is only to aid in the detail of the various equivalent modifications Integrated Understanding present invention.
Hereinafter, the embodiment of the present invention will be described with reference to the drawings.In the accompanying drawings, identical reference numeral represents identical
Or similar component, or same or like step.
Fig. 1 show the structure diagram of compound sensor of the present invention, wherein the compound sensor includes the first FBG light
Fibre 101, the second optical fiber 105, pure quartz capillary 102, ceramic glue 103 and golden coat 104.
Wherein, the FP and II type FBG compound sensor production methods for high temperature strain measurement, the described method includes following
Step：
1) the first FBG fiber gratings 101 of infrared femtosecond laser writing are penetrated into pure quartz capillary 102；
2) optical fiber will be cut away at the position of 101 grid region 5mm of the first FBG of distance, it is ensured that the smooth non-angular of fiber end face, and
First FBG 101 is fixed on the pure center of quartz capillary 102；
3) the second smooth optical fiber 105 of other one section of end face is penetrated to the other side of pure quartz capillary 102, with first
FBG optical fiber 101 forms FP compound sensors；
4) observe the reflectance spectrum of the FP compound sensors by high temperature strain measurement system, the first FBG optical fiber of adjustment and
Second fiber position is to optimal location；
5) ceramic glue 103 is coated in the first FBG optical fiber, the second optical fiber and quartz capillary, and is cured.
Wherein in step 5), the curing schedule of ceramic glue 103 includes：After when normal temperature cure 10 is small, 93.3 DEG C of curings 3 are small
When, when 121.1 DEG C of curings 3 are small.Ceramic glue 103 can also be fixed by golden coat 104 and blind.
Wherein, the high temperature strain measurement system described in step 4) includes sequentially connected wideband light source, circulator, and FP is compound
Sensor, spectrometer.Wherein spectrometer is used to be connected with computer, the reflectance spectrum of real-time display FP compound sensors, for adjusting
The first FBG optical fiber 101 and 105 position of the second optical fiber are saved to optimal location
The first FBG optical fiber 101 is incident optical, and second optical fiber 105 is mirror based fiber optica.The first FBG light
Fibre is II type FBG.
As shown in Figure 1, when compound sensor high temperature measurement of the present invention is with strain measurement, between chamber long d and sensor length L
Relation is：
Wherein,
Wherein λ1,λ2It is wavelength corresponding to reflectance spectrum maximum point respectively.
Wherein, ε represents dependent variable, and Δ d represents the variable quantity of chamber length, and wherein L is measurement length (the i.e. ceramic glue of sensor
Distance between 103 fixing points)
The present invention is act as using pure quartz capillary 102：Support and protective action are played, effectively protects FBG, and in fact
The accurate coupling of existing fiber end face.
Wherein the first optical fiber 101 is II type FBG, has good temperature stability, and high temperature resistance characteristic protrudes, and is to pass through arteries and veins
Impulse light realizes that physical damage causes the modulation of refractive index, and index modulation is up to 0.01.
Wherein, when carrying out temperature survey, the temperature change that fiber grating is measured is the present invention
Wherein Δ λBThe center wavelength variation amount demodulated for (FBG) demodulator, α are the thermal coefficient of expansion of fiber grating, and ξ is heat
Backscatter extinction logarithmic ratio, λBFor Prague centre wavelength of fiber grating.
When the present invention carries out strain measurement, wherein：
The thermal strain ε of measured objectthermal=αobject×ΔT (3)
Wherein αobjectFor the thermal coefficient of expansion of measured object, Δ T is the temperature change measured by FBG,
The logarithmic strain of final measured object should be εreal=ε-εthermal (4)
Optimal location wherein described in step 4) is：The interference spectrum density degree of FP sensors is suitable, is surveyed in whole temperature
It can be easy to read the change of wavelength corresponding to maximum in interference spectrum in the range of amount.
Fig. 2 show the spectral schematic after compound sensor encapsulation of the present invention, from figure 2 it can be seen that after encapsulation
When wavelength is 1555nm, cataclysm occurs compound sensor for wavelength.The centre wavelength and FP sensings of FBG can be read from Fig. 2
The interference spectrum of device.
Fig. 3 show the curve map of the first FBG centre wavelengths and temperature change of the invention, from figure 3, it can be seen that first
FBG centre wavelengths are directly proportional to temperature change.
Fig. 4 show compound sensor reflectance spectrum of the present invention and the curve map of temperature change, from fig. 4, it can be seen that temperature
Higher, it is longer that corresponding wavelength during cataclysm occurs for wavelength.
With reference to the explanation of the invention disclosed here and practice, the other embodiment of the present invention is for those skilled in the art
It all will be readily apparent and understand.Illustrate and embodiment is regarded only as being exemplary, true scope of the invention and purport are equal
It is defined in the claims.
Claims (6)
1. a kind of FP and II type FBG compound sensors for high temperature strain measurement, wherein the compound sensor includes, first
FBG optical fiber, the second optical fiber, pure quartz capillary, ceramic glue；
The production method of the compound sensor comprises the following steps：
1) the first FBG fiber gratings of inscription are penetrated into pure quartz capillary；
2) optical fiber will be cut away at the position of the first FBG grid regions 5mm, and the first FBG is fixed in quartz capillary
Centre；
3) the second smooth optical fiber of one section of end face is penetrated to the other side of quartz capillary, FP is formed with the first FBG ends optical fiber
Compound sensor；
4) reflectance spectrum of the FP compound sensors is observed by high temperature strain measurement system, adjusts the first FBG optical fiber and second
Fiber position is to optimal location；
5) ceramic glue is coated in the first FBG optical fiber, the second optical fiber and quartz capillary, and is cured.
2. compound sensor according to claim 1, it is characterised in that the step of ceramic glue described in step 5) cures is wrapped
Include：After when normal temperature cure 10 is small, when 93.3 DEG C of curings 3 are small, when 121.1 DEG C of curings 3 are small.
3. composite sensing according to claim 1 its, it is characterised in that the high temperature strain measurement system bag described in step 4)
Include sequentially connected wideband light source, circulator, FP compound sensors, spectrometer.
4. compound sensor according to claim 1, it is characterised in that the first FBG optical fiber is incident optical, described
Second optical fiber is mirror based fiber optica, wherein the first FBG optical fiber is II type FBG.
5. compound sensor according to claim 1, it is characterised in that the first FBG fiber gratings are flown by infrared
Second laser is inscribed.
6. compound sensor according to claim 1, it is characterised in that compound sensor is in high temperature strain measurement, temperature
Degree variable quantity and thermal stress meet following formula：
When carrying out temperature survey, the temperature change that fiber grating is measured is：
<mrow>
<mi>&Delta;</mi>
<mi>T</mi>
<mo>=</mo>
<mfrac>
<mrow>
<msub>
<mi>&Delta;&lambda;</mi>
<mi>B</mi>
</msub>
</mrow>
<mrow>
<mo>(</mo>
<mi>&alpha;</mi>
<mo>+</mo>
<mi>&xi;</mi>
<mo>)</mo>
<msub>
<mi>&lambda;</mi>
<mi>B</mi>
</msub>
</mrow>
</mfrac>
<mo>-</mo>
<mo>-</mo>
<mo>-</mo>
<mrow>
<mo>(</mo>
<mn>1</mn>
<mo>)</mo>
</mrow>
</mrow>
Wherein Δ λBThe center wavelength variation amount demodulated for (FBG) demodulator, α are the thermal coefficient of expansion of the first FBG, and ξ is thermo-optical coeffecient,
λBFor Prague centre wavelength of the first FBG；
When carrying out strain measurement, wherein：
The thermal strain ε of measured objectthermal=αobject×ΔT (2)
Wherein αobjectFor the thermal coefficient of expansion of measured object, Δ T is the temperature change measured by the first FBG.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711419407.8A CN107917674A (en) | 2017-12-25 | 2017-12-25 | FP and II type FBG compound sensors for high temperature strain measurement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711419407.8A CN107917674A (en) | 2017-12-25 | 2017-12-25 | FP and II type FBG compound sensors for high temperature strain measurement |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107917674A true CN107917674A (en) | 2018-04-17 |
Family
ID=61894179
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711419407.8A Pending CN107917674A (en) | 2017-12-25 | 2017-12-25 | FP and II type FBG compound sensors for high temperature strain measurement |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107917674A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108759704A (en) * | 2018-07-06 | 2018-11-06 | 武汉理工大学 | A kind of compound lumen type high-temp strain sensor of fiber F-P |
| CN110579288A (en) * | 2019-09-16 | 2019-12-17 | 西北大学 | Optical fiber sensor based on double capillary glass tube packaging |
| CN111024283A (en) * | 2019-12-20 | 2020-04-17 | 国家电网有限公司信息通信分公司 | Multi-parameter optical fiber sensing detection method and system for down-leading optical cable |
| CN111272804A (en) * | 2020-03-12 | 2020-06-12 | 陕西科技大学 | Device and method for measuring enamel linear thermal expansion coefficient in ceramic based on grating |
| CN114413780A (en) * | 2022-03-29 | 2022-04-29 | 中国飞机强度研究所 | Structural thermal strain measurement method for airplane test |
| CN114705229A (en) * | 2022-03-29 | 2022-07-05 | 深圳市联创杰科技有限公司 | Substrate-adjustable optical fiber FP composite temperature and humidity sensor chip based on sensitive material |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101833024A (en) * | 2009-03-09 | 2010-09-15 | 西北工业大学 | Sensing head of fiber Bragg grating F-P current sensor and making method thereof |
| CN102169027A (en) * | 2011-01-13 | 2011-08-31 | 华中科技大学 | Quasi-distributed optical fiber temperature and stress sensor and detector |
| CN102680022A (en) * | 2012-05-22 | 2012-09-19 | 北京交通大学 | Single fiber Bragg grating sensor for simultaneously measuring temperature and stress |
| CN105928468A (en) * | 2016-06-24 | 2016-09-07 | 深圳市畅格光电有限公司 | Fiber grating strain sensor and manufacturing method thereof |
| CN106546182A (en) * | 2016-11-03 | 2017-03-29 | 北京信息科技大学 | A kind of high-temperature resistant optical fiber grating strain transducer of incline structure |
| CN106643908A (en) * | 2017-01-16 | 2017-05-10 | 深圳大学 | Method for preparing temperature-pressure sensor, temperature-pressure sensor structure and temperature-pressure measuring system and method |
-
2017
- 2017-12-25 CN CN201711419407.8A patent/CN107917674A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101833024A (en) * | 2009-03-09 | 2010-09-15 | 西北工业大学 | Sensing head of fiber Bragg grating F-P current sensor and making method thereof |
| CN102169027A (en) * | 2011-01-13 | 2011-08-31 | 华中科技大学 | Quasi-distributed optical fiber temperature and stress sensor and detector |
| CN102680022A (en) * | 2012-05-22 | 2012-09-19 | 北京交通大学 | Single fiber Bragg grating sensor for simultaneously measuring temperature and stress |
| CN105928468A (en) * | 2016-06-24 | 2016-09-07 | 深圳市畅格光电有限公司 | Fiber grating strain sensor and manufacturing method thereof |
| CN106546182A (en) * | 2016-11-03 | 2017-03-29 | 北京信息科技大学 | A kind of high-temperature resistant optical fiber grating strain transducer of incline structure |
| CN106643908A (en) * | 2017-01-16 | 2017-05-10 | 深圳大学 | Method for preparing temperature-pressure sensor, temperature-pressure sensor structure and temperature-pressure measuring system and method |
Non-Patent Citations (2)
| Title |
|---|
| YUMIN ZHANG等: "Thermal characteristics of Fabry–Perot cavity based on", 《CHINESE OPTICS LETTERS》 * |
| 丁旭东等: ""纯石英芯光纤光栅高温应变响应特性"", 《中国激光》 * |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108759704A (en) * | 2018-07-06 | 2018-11-06 | 武汉理工大学 | A kind of compound lumen type high-temp strain sensor of fiber F-P |
| CN110579288A (en) * | 2019-09-16 | 2019-12-17 | 西北大学 | Optical fiber sensor based on double capillary glass tube packaging |
| CN110579288B (en) * | 2019-09-16 | 2020-11-13 | 西北大学 | Optical fiber sensor based on double capillary glass tube packaging |
| CN111024283A (en) * | 2019-12-20 | 2020-04-17 | 国家电网有限公司信息通信分公司 | Multi-parameter optical fiber sensing detection method and system for down-leading optical cable |
| CN111024283B (en) * | 2019-12-20 | 2021-08-17 | 国家电网有限公司信息通信分公司 | Multi-parameter optical fiber sensing detection method and system for down-leading optical cable |
| CN111272804A (en) * | 2020-03-12 | 2020-06-12 | 陕西科技大学 | Device and method for measuring enamel linear thermal expansion coefficient in ceramic based on grating |
| CN114413780A (en) * | 2022-03-29 | 2022-04-29 | 中国飞机强度研究所 | Structural thermal strain measurement method for airplane test |
| CN114413780B (en) * | 2022-03-29 | 2022-06-24 | 中国飞机强度研究所 | Structural thermal strain measurement method for airplane test |
| CN114705229A (en) * | 2022-03-29 | 2022-07-05 | 深圳市联创杰科技有限公司 | Substrate-adjustable optical fiber FP composite temperature and humidity sensor chip based on sensitive material |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107917674A (en) | FP and II type FBG compound sensors for high temperature strain measurement | |
| CN108195299A (en) | For the FP of high temperature strain measurement and regeneration FBG compound sensors | |
| Allwood et al. | A highly sensitive fiber Bragg grating diaphragm pressure transducer | |
| CN205655942U (en) | Meet an emergency and optical fiber sensor of temperature simultaneous measurement | |
| Ng et al. | A simple temperature-insensitive fiber Bragg grating displacement sensor | |
| CN103792015A (en) | On-line monitoring method for temperature and strain in composite material autoclave solidification process | |
| Lu et al. | Fiber-optic temperature sensor using a Fabry–Pérot cavity filled with gas of variable pressure | |
| Kong et al. | High-sensitivity and fast-response fiber-optic micro-thermometer based on a plano-concave Fabry-Pérot cavity filled with PDMS | |
| Reddy et al. | Method for enhancing and controlling temperature sensitivity of fiber Bragg grating sensor based on two bimetallic strips | |
| CN111609809A (en) | Optical fiber high-temperature strain measurement sensor based on strain sensitization structure | |
| Yi et al. | PDMS-coated no-core fiber interferometer with enhanced sensitivity for temperature monitoring applications | |
| Zhang et al. | Optical fiber thermal anemometer with light source-heated Fabry–Perot interferometer | |
| Qi et al. | Temperature-insensitive two-dimensional vector bending sensor based on Fabry-Pérot interferometer incorporating a seven-core fiber | |
| Zhang et al. | A method for standardizing the manufacturing process of integrated temperature and humidity sensor based on fiber Bragg grating | |
| Zhang et al. | High-sensitivity temperature sensor based on two parallel Fabry–Pérot interferometers and Vernier effect | |
| CN204101218U (en) | A kind of F-P cavity fiber pressure sensing device | |
| CN108036733A (en) | Temperature and strain while measurement sensor under II type-IR type polarization-maintaining FBG hot environments | |
| Reddy et al. | A novel method for high temperature measurements using fiber Bragg grating sensor | |
| Rana et al. | Differently Structured Fabry-Perot Interferometers for Gas Pressure Monitoring | |
| TWI458939B (en) | Highly sensitive optical interferometer and its making method | |
| CN113029218B (en) | Vernier effect optical fiber interference sensor demodulation device and method based on silicon-based micro-ring | |
| CN108151909A (en) | A kind of superelevation temperature sensor based on FBG | |
| CN221224039U (en) | Calibrating device for distributed optical fiber temperature sensor | |
| Xiaohang et al. | A hybrid design of temperture-strain dual-parameter sensing based on sampled fiber grating | |
| Mądry et al. | The compact FBG-based humidity sensor setup |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20180417 |
|
| RJ01 | Rejection of invention patent application after publication |