CN107255533A - A kind of optical fiber Bragg grating temperature sensor of super-wide range - Google Patents
A kind of optical fiber Bragg grating temperature sensor of super-wide range Download PDFInfo
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- CN107255533A CN107255533A CN201710434831.3A CN201710434831A CN107255533A CN 107255533 A CN107255533 A CN 107255533A CN 201710434831 A CN201710434831 A CN 201710434831A CN 107255533 A CN107255533 A CN 107255533A
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- temperature
- bragg grating
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
- G01K11/3206—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres at discrete locations in the fibre, e.g. using Bragg scattering
Abstract
The invention discloses a kind of optical fiber Bragg grating temperature sensor of super-wide range.The sensor production method includes：First, Bragg grating is inscribed on golden coated fiber and is encapsulated into the composite capillary of stainless steel tube and refractory ceramics capillary suit, is fixed by laser welding.Regenerating model based on fiber grating is calculated and preferably suitable regeneration temperature, then high temperature furnace temperature is set to design temperature, the sensing head insertion high temperature furnace of grating belt is subjected to high annealing, temperature is increased to 1200 DEG C of progress high-temperature process by annealing after finishing, you can obtain the optical fiber Bragg grating temperature sensor of super-wide range.It is 1200 DEG C to make the obtained temperature measurement range upper limit of optical fiber Bragg grating temperature sensor, and lower limit is less than 196 DEG C, and this sensor accuracy is high, small volume, lightweight, makes simple.
Description
Technical field
The present invention relates to the technical field of fiber-optic grating sensor, and in particular to a kind of optical fiber Bragg light of super-wide range
Grid temperature sensor.
Background technology
Fiber-optic grating sensor has small, lightweight size, electromagnetism interference, radioresistance, corrosion-resistant, fire prevention, explosion-proof, longevity
The advantages of ordering long, and have when carrying out temperature survey that precision is high, is accurately positioned in real time and can realize quasi- distribution measuring etc.
Feature, causes the concern of large quantities of researchers, and is widely used in various field of temperature measurement.
The above-mentioned advantage of fiber-optic grating sensor extremely meets the fields such as petrochemical industry, electric power monitoring and Aero-Space
Application requirement, have very strong competitiveness.But the application in these fields needs to measure larger temperature range mostly, this
Performance to fiber grating proposes higher requirement.Although ordinary optic fibre grating can be measured at low ambient temperatures,
It is to start to degenerate when temperature is increased to 200~300 DEG C, is completely erased in 700 DEG C or so index modulations.Common grating temperature
The sensing short life of the measurement range of sensor generally within 500 DEG C and at high temperature, significantly limit grating temperature biography
Application of the sensor in hot environment.
Wang Dongning etc., which inscribes II type grating using femtosecond laser and does pretreatment, can be achieved the high temperature that temperature is higher than 1000 DEG C
Measure (Liao C, Wang D N, Li Y, et al.Temporal thermal response of Type II-IR fiber
Bragg gratings,Applied Optics,2009,48(16):3001-3007), regeneration grating can also realize high temperature measurement
(Oliveira V D,Abe I,Alberto N J,et al.Fibre Bragg Gratings,towards a Better
Thermal Stability at High Temperatures,Physics Procedia,2015,62:71-78；Wang Qiaoni,
Yang Yuanhong, He Jun, wait Fiber Bragg Grating FBGs regenerative process and scale-model investigation, Acta Optica, 2016 (3):38-45).However,
The II type preparing grating complex process that femtosecond laser is inscribed, inscribes and requires higher, it is difficult to produced in enormous quantities.Though regenerate grating
High temperature measurement can be achieved but stability is inadequate.In addition, mechanical strength is relatively low after grating regeneration, it is difficult to carry out the height under complex environment
Temperature sensing.To sum up, actual available super-wide range grating temperature sensor is there is no at present.
In order to solve the above problems, the compound capillary that the present invention is set with using stainless steel tube and refractory ceramics capillary
Pipe is packaged to fiber grating, to protect grating and ensure its high-temperature tolerance, the regeneration mould based on Fiber Bragg Grating FBG
Type calculate and preferably suitable regeneration temperature, and carries out high-temperature process after annealing is finished, and obtains the optical fiber of super-wide range
Bragg grating temperature sensor.The arrangement of temperature sensor is simple, and temperature measurement range is extremely wide, and precision is high, small volume, weight
Gently, it is easy to make.
The content of the invention
The technical problem to be solved in the present invention is：A kind of optical fiber Bragg grating temperature sensor of super-wide range is made,
It is realized and reliably encapsulates and reduces its manufacturing conditions.
The present invention solve above-mentioned technical problem use technical scheme be：
The present invention provides a kind of optical fiber Bragg grating temperature sensor of super-wide range, and its manufacturing process includes following step
Suddenly：
S1, Bragg grating is inscribed on golden coated fiber；
S2, grating is encapsulated into the composite capillary of stainless steel tube and ceramic capillary suit, passes through laser
It is welded and fixed；
S3, the regenerating model based on Fiber Bragg Grating FBG is calculated and preferably suitable regeneration temperature；
S4, sets high temperature furnace temperature to design temperature, the sensing head of grating belt is inserted into high temperature furnace high annealing；
Temperature is increased to 1200 DEG C of progress high-temperature process by S5, annealing after finishing, and obtains the optical fiber Bragg of super-wide range
Grating temperature sensor.
Further, the golden coated fiber Bragg grating is the optical fiber in gold coating using ultraviolet or femto-second laser
Upper inscription Bragg grating is obtained, and golden coated fiber is excellent in terms of mechanical strength, protection against the tide, resistance to corrosion and high-low temperature resistant characteristic
In ordinary optic fibre, and it is more suitable for laser welding.
Further, the encapsulation is to enter the fibre-optic package with Fiber Bragg Grating FBG by stainless steel tube and refractory ceramics
In the composite capillary of capillary suit, stainless steel tube is that outer tube, refractory ceramics capillary are inner tube, and both pass through interference
Coordinate assembling, stainless steel tube one end sintering closing, ceramic capillary internal diameter is slightly larger than 2-3 microns of fibre external diameters.
Further, the regenerating model of the Fiber Bragg Grating FBG is by carrying out different annealing temperature to multiple seed gratings
Constant temperature processing is spent, recovery time data of the seed grating under different annealing temperature is obtained, utilizes hyperbolic cosecant (csch) function
Model is set up, its expression is：
In formula：T is the recovery time, and T is annealing temperature, TthIt is regeneration temperature threshold value, A and B are particular type fiber gratings
Model parameter, model coefficient is determined using linear curve fitting method, can be calculated by model and preferred different optical fiber
The suitable regeneration temperature of Bragg grating.
Further, the annealing process is sets high temperature furnace temperature to design temperature, by with Fiber Bragg Grating FBG
Sensing head insertion high temperature furnace carries out high annealing, and annealing time is calculated by model according to design temperature and obtained, and passes through annealing process
Erasing and regeneration index modulation can greatly improve stability of regeneration grating when in less than annealing temperature.
Further, the high-temperature process is that temperature is increased into 1200 DEG C after annealing is finished, and carries out constant temperature processing,
Processing time is more than 12 hours, and the high-temperature stability of sensor can be further improved by high-temperature process, prevents sensor from existing
Drifted about under hot environment.
The advantage of the present invention compared with prior art is：
(1) composite capillary that the present invention is set with using stainless steel tube and refractory ceramics capillary is entered to fiber grating
Row encapsulation, to protect grating and ensure its high-temperature tolerance, enhances the mechanical strength of grating sensor, can be suitably used for complicated survey
Warm environment.
(2) during making grating sensor of the invention, the regenerating model based on Fiber Bragg Grating FBG calculate and preferred
Suitable regeneration temperature, and high-temperature process is carried out after annealing is finished, the fiber bragg grating temperature for obtaining super-wide range is passed
Sensor.Sensor construction is simple, and precision is high, and small volume is lightweight, easy to make.
Brief description of the drawings
Fig. 1 is a kind of temperature sensor Making programme figure of super-wide range.
Fig. 2 is composite bushing and grating mounting structure schematic diagram.In Fig. 2,11 be golden coated fiber, and 12 be the Bradley inscribed
Lattice grating, 13 be refractory ceramics capillary inner tube, and 14 be stainless steel outer tube, and 15 be stainless steel tube weld point, and 16 be Laser Welding contact.
Fig. 3 is typical regeneration curve and model parameter.
Fig. 4 is the wavelength stabilization and reflectance curve after high-temperature process.
Fig. 5 is high-temperature test device schematic diagram.In Fig. 5,21 ' be original temperature sensor, and 22 be SM125 (FBG) demodulators, 23
It is high temperature furnace built-in thermocouple, 24 be high temperature furnace internal thermometer, and 25 be high temperature process furnances (FNS SK-3-12Y), and 26 be high temperature
Furnace base, 27 be high temperature cotton.
Fig. 6 is low temperature test device, and 21 be super-wide range sensor probe, and 22 be SM125 (FBG) demodulators, and 31 be secondary standard
Platinum resistance thermometer, 32 be the digital multimeter of Agilent 34401, and 33 be liquid nitrogen, and 34 be liquid nitrogen container, and 35 be heat barrier foam, 36
It is adjustable support.
Fig. 7 is height temperature measurement typical consequence.
Embodiment
Present invention is described in further detail below in conjunction with the accompanying drawings.
Fig. 1 shows a kind of Making programme of the optical fiber Bragg grating temperature sensor of super-wide range of the present invention, specifically
Comprise the following steps：
1) seed grating is inscribed using ultraviolet laser and phase mask on the optical fiber of gold coating.
2) shown in refer to the attached drawing 2, internal diameter is slightly larger than 2-3 microns of fibre external diameters, external diameter is 1mm, and length is 100mm height
Warm ceramics capillary inner tube 13 and internal diameter are 1mm, and external diameter is 2mm, and length passes through interference fit group for 100mm stainless steel outer tube 14
Composite capillary is dressed up, then the Bragg grating 12 of inscription is inserted composite capillary, made by the sintering closing of stainless steel tube one end
Grating region is located in composite capillary, and golden coated fiber is fixed in Laser Welding contact 16 using laser welding mode.
3) according to regenerating model and shorter regeneration grating Production Time, heat treatment temperature is preferably 950 DEG C, is calculated
It is 26.5min to go out now heat treatment time.
4) shown in refer to the attached drawing 5, the original temperature sensor 21 ' after encapsulation is placed in high temperature process furnances 25, constant 950
DEG C the high temperature anneal 26.5min.
5) constant 1200 DEG C of 12h high-temperature process is carried out after annealing is finished immediately, you can obtain super-wide range temperature and pass
Sensor 21.
5, accompanying drawing 6 and accompanying drawing 7, specifically introduce a kind of fiber bragg grating temperature biography of super-wide range below in conjunction with the accompanying drawings
The temperature test process of sensor.
Shown in refer to the attached drawing 5, super-wide range sensor probe 21 is placed in high temperature process furnances 25, probe positions are in
At high temperature furnace built-in thermocouple 23, high temperature furnace internal thermometer 24 carries out temperature monitoring, and as reference temperature, is set by changing
The heating-up temperature put controls temperature range with this.
Shown in refer to the attached drawing 6, liquid nitrogen 33 is used to manufacture low temperature environment, by super-wide range sensor probe 21 and secondary standard
Platinum resistance thermometer 31 is inserted in liquid nitrogen container 34 with sustained height, and secondary standard platinum resistance thermometer 31 carries out temperature monitoring, and
As reference temperature, the distance of sensor and liquid nitrogen is controlled to control temperature range with this by adjustable support 36.
Shown in refer to the attached drawing 7, sensor probe can realize -196 DEG C to 1200 DEG C of super-wide temperature range measurement.Whole
In individual temperature sensitive range, grating Bragg wavelength is in conic section relation with temperature, and heating and cooling are reproducible, average sensitive
About 10pm/ DEG C of degree, temperature measurement accuracy is better than ± 1.5 DEG C.
The technology contents that the present invention is not elaborated belong to the known technology of those skilled in the art, and above-mentioned specific implementation
Only feasibility embodiment of the present invention is illustrated, and is not used to limit the scope of the invention, all without departing from this hair
The equivalent implementations or change that bright technical thought is done should be included within the scope of the present invention.
Claims (5)
1. a kind of optical fiber Bragg grating temperature sensor of super-wide range, it is characterised in that：Its manufacturing process includes following step
Suddenly：
S1, Bragg grating is inscribed on golden coated fiber；
S2, grating is encapsulated into the composite capillary of stainless steel tube and ceramic capillary suit, passes through laser welding
It is fixed；
S3, the regenerating model based on Fiber Bragg Grating FBG is calculated and preferably suitable regeneration temperature；
S4, sets high temperature furnace temperature to design temperature, the sensing head of grating belt is inserted into high temperature furnace high annealing；
Temperature is increased to 1200 DEG C of progress high-temperature process by S5, annealing after finishing, and obtains the Fiber Bragg Grating FBG of super-wide range
Temperature sensor.
2. a kind of optical fiber Bragg grating temperature sensor of super-wide range according to claim 1, it is characterised in that：Will
Bragg grating is scribed on golden coated fiber.
3. a kind of optical fiber Bragg grating temperature sensor of super-wide range according to claim 1, it is characterised in that：Band
The fibre-optic package of Fiber Bragg Grating FBG enters in the composite capillary of stainless steel tube and refractory ceramics capillary suit, no
Rust steel pipe is that outer tube, refractory ceramics capillary are inner tube, and both are assembled by being interference fitted, the sintering closing of stainless steel tube one end,
Ceramic capillary internal diameter is slightly larger than 2-3 microns of fibre external diameters, and stainless steel tube fixes golden coated fiber by laser welding mode.
4. a kind of optical fiber Bragg grating temperature sensor of super-wide range according to claim 1, it is characterised in that：Light
The regenerating model of fine Bragg grating is：
<mrow>
<mi>t</mi>
<mo>=</mo>
<mi>A</mi>
<mo>&CenterDot;</mo>
<mi>csc</mi>
<mi>h</mi>
<mrow>
<mo>(</mo>
<mfrac>
<mrow>
<mi>T</mi>
<mo>-</mo>
<msub>
<mi>T</mi>
<mrow>
<mi>t</mi>
<mi>h</mi>
</mrow>
</msub>
</mrow>
<mi>B</mi>
</mfrac>
<mo>)</mo>
</mrow>
</mrow>
In formula：T is the recovery time, and T is annealing temperature, TthIt is regeneration temperature threshold value, A and B are the moulds of particular type fiber grating
Shape parameter.
5. a kind of optical fiber Bragg grating temperature sensor of super-wide range according to claim 1, it is characterised in that：If
High temperature furnace temperature is put to design temperature, the sensing head of grating belt is inserted into high temperature furnace high annealing, is annealed temperature liter after finishing
High to 1200 DEG C progress high-temperature process, processing time is more than 12 hours.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107860493A (en) * | 2017-12-25 | 2018-03-30 | 北京信息科技大学 | Regenerate DFB optical-fiber laser hyperthermic temperature measuring systems |
| CN108332878A (en) * | 2018-01-31 | 2018-07-27 | 北京航天控制仪器研究所 | A kind of fiber-optical grating temperature sensor and preparation method |
| CN108917803A (en) * | 2018-08-08 | 2018-11-30 | 西安交通大学 | A kind of preparation method of the distributed high-temperature resistant optical fiber grating sensor based on metal coated fiber |
| CN111486880A (en) * | 2020-04-07 | 2020-08-04 | 南京航空航天大学 | Molding self-monitoring intelligent composite material and monitoring method thereof |
| CN114136349A (en) * | 2021-11-16 | 2022-03-04 | 西安交通大学 | High-temperature-resistant Bragg fiber grating sensor with variable sensing quantity and preparation method thereof |
| CN114518620A (en) * | 2022-01-24 | 2022-05-20 | 江苏睿赛光电科技有限公司 | High-power fiber grating laser annealing system and method |
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| US7835605B1 (en) * | 2009-05-21 | 2010-11-16 | Hong Kong Polytechnic University | High temperature sustainable fiber bragg gratings |
| US20120039561A1 (en) * | 2010-08-13 | 2012-02-16 | Qorex Llc | High temperature fiber optic turnaround |
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| US7835605B1 (en) * | 2009-05-21 | 2010-11-16 | Hong Kong Polytechnic University | High temperature sustainable fiber bragg gratings |
| US20120039561A1 (en) * | 2010-08-13 | 2012-02-16 | Qorex Llc | High temperature fiber optic turnaround |
Non-Patent Citations (3)
| Title |
|---|
| D. BARRERA 等: "Packaged Optical Sensors based on Regenerated Fiber Bragg Gratings for high temperature applications", 《IEEE SENSORS JOURNAL》 * |
| LIN LU 等: "Fiber Bragg grating regeneration modeling and ultra-wide temperature sensing application", 《PROC. SPIE 10100, OPTICAL COMPONENTS AND MATERIALS XIV》 * |
| QIAONI WANG 等: "Femtosecond laser inscribed Bragg gratings in gold-coated fiber for space application", 《PROC. SPIE 9634, 24TH INTERNATIONAL CONFERENCE ON OPTICAL FIBRE SENSORS》 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107860493A (en) * | 2017-12-25 | 2018-03-30 | 北京信息科技大学 | Regenerate DFB optical-fiber laser hyperthermic temperature measuring systems |
| CN108332878A (en) * | 2018-01-31 | 2018-07-27 | 北京航天控制仪器研究所 | A kind of fiber-optical grating temperature sensor and preparation method |
| CN108917803A (en) * | 2018-08-08 | 2018-11-30 | 西安交通大学 | A kind of preparation method of the distributed high-temperature resistant optical fiber grating sensor based on metal coated fiber |
| CN111486880A (en) * | 2020-04-07 | 2020-08-04 | 南京航空航天大学 | Molding self-monitoring intelligent composite material and monitoring method thereof |
| CN114136349A (en) * | 2021-11-16 | 2022-03-04 | 西安交通大学 | High-temperature-resistant Bragg fiber grating sensor with variable sensing quantity and preparation method thereof |
| CN114518620A (en) * | 2022-01-24 | 2022-05-20 | 江苏睿赛光电科技有限公司 | High-power fiber grating laser annealing system and method |
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