CN109282913A - A kind of non-contact temperature measuring device based on bragg grating - Google Patents

A kind of non-contact temperature measuring device based on bragg grating Download PDF

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Publication number
CN109282913A
CN109282913A CN201810834312.0A CN201810834312A CN109282913A CN 109282913 A CN109282913 A CN 109282913A CN 201810834312 A CN201810834312 A CN 201810834312A CN 109282913 A CN109282913 A CN 109282913A
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CN
China
Prior art keywords
laser
wavelength
sensor
bragg grating
demodulation
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CN201810834312.0A
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Chinese (zh)
Inventor
刘菲菲
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孝感锐创机械科技有限公司
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Priority to CN201810834312.0A priority Critical patent/CN109282913A/en
Publication of CN109282913A publication Critical patent/CN109282913A/en

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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01KMEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K11/00Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
    • G01K11/32Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmission, scattering or fluorescence in optical fibres
    • G01K11/3206Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmission, scattering or fluorescence in optical fibres at discrete locations in the fibre, e.g. by means of Bragg gratings

Abstract

The invention discloses a kind of non-contact temperature measuring device based on bragg grating, including wide range laser, incident optical, coupler, transmission fiber, several sensors, the output optical fiber, beam expanding lens, collimating mirror, transparent glass, FP wavelength demodulation device, signal processor and to temperature measurement box body.The laser beam that wide range laser generates enters coupler through incident optical, reach the array that N number of sensor is constituted, the laser of each sensor reflection exports in the output optical fiber after coupler again, and in the output optical fiber end face after beam expanding lens is expanded and corrected with collimating mirror, form collimated laser beam, FP wavelength demodulation device calculates the corresponding temperature value of each bragg fiber sensor institute reflection wavelength to the Wavelength demodulation of collimated laser beam, signal processor.The present invention has many advantages, such as that precision height, electromagnetism interference, dynamic range are big and can realize distributed measurement.

Description

A kind of non-contact temperature measuring device based on bragg grating

Technical field

The present invention provides a kind of non-contact temperature measuring devices more particularly to a kind of non-based on bragg grating to connect Touch temperature measuring equipment.

Background technique

Contactless temperature-measuring system based on optical system is the main flow direction of contactless temperature-measuring technical field, is connect Ru non- Touch infrared temperature measurement system, but the system haves the shortcomings that measurement environment is limited and precision is not high;For another example it is based on optical interference The contactless temperature-measuring system of principle, but the system debug required precision is high, haves the shortcomings that practical operation requirement is too high.

Summary of the invention

In order to overcome defect existing for above-mentioned technology or deficiency, propose here a kind of based on the non-of bragg grating Contact temperature-measuring device has many advantages, such as that precision height, electromagnetism interference, dynamic range are big and can realize distributed temperature measuring.

To achieve the goals above the invention adopts the following technical scheme:

A kind of non-contact temperature measuring device based on bragg grating, it is characterised in that: it include wide range laser, Incident optical, coupler, transmission fiber, N number of sensor, the output optical fiber, beam expanding lens, collimating mirror, transparent glass, FP Wavelength demodulation Instrument, signal processor and to temperature measurement box body;

The wide range laser generates a branch of wide range laser beam, and laser wavelength range is 1100nm~1800nm, the wave Long range covers all reflected wavebands of optical fibre optical grating sensing array enough, and laser power is not less than 1mJ, it is ensured that outgoing laser beam Wavelength is effectively demodulated;

The incident optical, transmission fiber and the output optical fiber are the identical multimode fibre of parameter;

The coupler is 2 × 2 coupler of waveguiding structure;

N number of sensor is the bragg grating of reflection-type, reflection laser central wavelength and screen periods It is positively correlated, the sensor is made of Bragg grating, temperature sensitivity obturator and metal shell, and Bragg grating is sealed in In temperature sensitivity obturator, outside is encapsulated using metal shell, and when the temperature is changed, temperature sensitivity obturator volume becomes Change, to change the screen periods of Bragg grating, leads to the variation of its reflection kernel wavelength;

The beam expanding lens is completed to export expanding for laser in the output optical fiber, increases the radius of outgoing laser beam;

The collimating mirror is completed to the collimation for expanding laser beam, and the laser beam datum of diverging is become parallel laser beam;

The transparent glass is fixed on cabinet to be measured, and transparent glass end face is strictly parallel;

The FP wavelength demodulation device is the wavelength demodulation device based on Fabry Perot principle of interference, be can be realized to wavelength High-precision Real-time demodulation, and the wavelength information demodulated is transferred out;

The signal processor receives the wavelength information of FP wavelength demodulation device Real-time demodulation, by by wavelength information and Bradley The comparison of lattice fibre optical sensor parameter, calculates the temperature information at each sensor;

It is described to temperature measurement box body be simulation to thermometric space;

Further, N number of sensor is arranged using array, realizes distributed temperature measuring, N number of sensor array In Bragg grating measured temperature within the scope of the variation range of wavelength do not overlap, and be distributed in wide range laser wavelength range It is interior;

Further, the beam expanding lens, collimating mirror and transparent glass position are parallel to each other.

Working principle of the present invention is as follows:

Wide range laser generates a beam of broad spectrum laser beam, and arrival, which is spread, after incident optical enters 2 × 2 couplers is passing The array that N number of sensor on defeated fibre circuit is constituted, each sensor are reflected back the laser of a specific wavelength, then through 2 It exports in the output optical fiber after × 2 couplers, and is expanded through beam expanding lens with after collimating mirror correction in the output optical fiber end face, formed quasi- Collimated excitation beam, FP wavelength demodulation device carry out real-time Wavelength demodulation to the collimated laser beam of output, and by the wavelength information of demodulation It is transferred to signal processor, the corresponding temperature value of each sensor institute reflection wavelength is calculated by signal processor, to realize Distributed temperature measuring based on Bragg grating.

Because the invention adopts the above technical scheme, have it is following the utility model has the advantages that

One, using the thermometric based on Bragg grating, have many advantages, such as that precision height, electromagnetism interference, dynamic range are big;

Two, it is distributed using array, realizes distributed temperature measuring.

Detailed description of the invention

Fig. 1 is principle of the invention figure;

Fig. 2 is the structure chart of sensor in the present invention.

In figure: 1- wide range laser, 2- incident optical, 3- coupler, 4- transmission fiber, 5- sensor, the Prague 5-1- Grating, 5-2- temperature sensitivity obturator, 5-3- metal shell, 6- the output optical fiber, 7- beam expanding lens, 8- collimating mirror, 9- transparent glass, 10-FP wavelength demodulation device, 11- signal processor, 12- wait for temperature measurement box body.

Specific embodiment

In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and It is not used in the restriction present invention.As long as in addition, technical characteristic involved in the various embodiments of the present invention described below Not constituting a conflict with each other can be combined with each other.

A kind of non-contact temperature measuring device based on bragg grating, as shown in Figure 1, it is characterised in that: it includes Wide range laser 1, incident optical 2, coupler 3, transmission fiber 4, N number of sensor 5, the output optical fiber 6, beam expanding lens 7, collimating mirror 8, Transparent glass 9, FP wavelength demodulation device 10, signal processor 11 and to temperature measurement box body 12;

The wide range laser 1 generates a branch of wide range laser beam, and laser wavelength range is 1100nm~1800nm, laser function Rate is not less than 1mJ;

The incident optical 2, transmission fiber 4 and the output optical fiber 6 are the identical multimode fibre of parameter;

The coupler 3 is 2 × 2 coupler of waveguiding structure;

N number of sensor 5 is the bragg grating of reflection-type, reflection laser central wavelength and screen periods It is positively correlated, 5 structure of sensor is as shown in Fig. 2, by Bragg grating 5-1, temperature sensitivity obturator 5-2 and metal shell 5-3 is constituted, and Bragg grating 5-1 is sealed in temperature sensitivity obturator 5-2, and outside is encapsulated using metal shell 5-3, works as temperature When variation, temperature sensitivity obturator 5-2 volume changes, to change the screen periods of Bragg grating 5-1, causes it anti- Penetrate the variation of central wavelength;

The beam expanding lens 7 is completed to export expanding for laser in the output optical fiber 6, increases the radius of outgoing laser beam;

The collimating mirror 8 is completed to the collimation for expanding laser beam, and the laser beam datum of diverging is become collimated laser beam;

The transparent glass 9 is fixed on cabinet 12 to be measured, and 9 end face of transparent glass is strictly parallel;

The FP wavelength demodulation device 10 is the wavelength demodulation device based on Fabry Perot principle of interference, be can be realized to wave Long high-precision Real-time demodulation, and the wavelength information demodulated is transferred out;

The signal processor 11 receives the wavelength information of 10 Real-time demodulation of FP wavelength demodulation device, by by wavelength information with The comparison of 5 parameter of sensor calculates the temperature information at each sensor 5;

It is described to temperature measurement box body 12 be simulation to thermometric space;

N number of sensor 5 described in above scheme is arranged using array, realizes distributed temperature measuring, N number of sensor 5 The variation range of wavelength does not overlap within the scope of Bragg grating 5-1 measured temperature in array, and is distributed in wide range laser It is such as 0 DEG C~100 DEG C to temperature-measuring range, wide range laser source spectral region is 1100nm~1800nm, by 3 in wave-length coverage Sensor 5 forms array, and in institute's temperature-measuring range, the 1st 5 reflection laser wave-length coverage of sensor is 1545nm~1550nm, 2nd 5 reflection laser wave-length coverage of sensor is 1555nm~1560nm, and the 3rd 5 reflection laser wave-length coverage of sensor is 1565nm~1570nm, wavelength do not overlap, so that can calculate sensor temperature and discrimination simultaneously when demodulating wavelength It is which sensor out;

Beam expanding lens 7, collimating mirror 8 and 9 position of transparent glass in above scheme are parallel to each other;

The working principle of above scheme is as follows:

Wide range laser 1 generates a beam of broad spectrum laser beam, reaches and spreads after incident optical 2 enters 2 × 2 couplers 3 The array that N number of sensor 5 on transmission fiber route is constituted, each sensor 5 are reflected back the laser of a specific wavelength, It is exported in the output optical fiber 6 after 2 × 2 couplers 3 again, and is expanded into 6 end face of the output optical fiber through beam expanding lens 7 and expand laser After beam, then the correction of collimated mirror 8, collimated laser beam is formed, the collimated laser beams of 10 pairs of FP wavelength demodulation device output carry out real-time Wavelength demodulation, and the wavelength information of demodulation is transferred to signal processor 11, each sensing is calculated by signal processor 11 The corresponding temperature value of 5 reflection wavelengths of device, to realize the distributed temperature measuring based on Bragg grating 5-1.

Assuming that the screen periods of Bragg grating 5-1 are Λ, fiber core refractive index n, bragg wavelength λB, then have relationship Formula λB=2n Λ.

Assuming that the temperature expansion coefficient of temperature sensitivity obturator 5-2 is τ in sensor 5, when temperature variation is Δ T, The screen periods variation of Bragg grating 5-1 is Δ Λ, then has Δ Λ/Λ=τ Δ T.

It two formulas will combine, obtain: Δ T=Δ λ aboveB/ 2n τ Λ, Δ λBIt is reflected for the screen periods of Bragg grating 5-1 Center wavelength variation amount, being generalized to 5 array of sensor has: Δ Tm=Δ λBm/2nτΛm, m represents m-th of sensor 5, i.e., logical The wavelength information of Real-time demodulation is crossed, signal processor 11 can calculate the temperature of each sensor 5 in 5 array of sensor simultaneously Degree.

As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to The limitation present invention, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should all include Within protection scope of the present invention.

Claims (3)

1. a kind of non-contact temperature measuring device based on bragg grating, it is characterised in that: it includes wide range laser (1), incident optical (2), coupler (3), transmission fiber (4), N number of sensor (5), the output optical fiber (6), beam expanding lens (7), collimation Mirror (8), transparent glass (9), FP wavelength demodulation device (10), signal processor (11) and to temperature measurement box body (12);
The wide range laser (1) generates a branch of wide range laser beam, and laser wavelength range is 1100nm~1800nm, laser power Not less than 1mJ;
The incident optical (2), transmission fiber (4) and the output optical fiber (6) are the identical multimode fibre of parameter;
The coupler (3) is 2 × 2 coupler of waveguiding structure;
N number of sensor (5) be the bragg grating of reflection-type, reflection laser central wavelength and screen periods at It being positively correlated, the sensor (5) is made of Bragg grating (5-1), temperature sensitivity obturator (5-2) and metal shell (5-3), Bragg grating (5-1) is sealed in temperature sensitivity obturator (5-2), and outside is encapsulated using metal shell (5-3), when temperature becomes When change, temperature sensitivity obturator (5-2) volume changes, to change the screen periods of Bragg grating (5-1), leads to it The variation of reflection kernel wavelength;
The beam expanding lens (7) completes to export expanding for laser in the output optical fiber (6), increases the radius of outgoing laser beam;
The collimating mirror (8) is completed to the collimation for expanding laser beam, and the laser beam datum of diverging is become collimated laser beam;
The transparent glass (9) is fixed on cabinet to be measured (12), and transparent glass (9) end face is strictly parallel;
The FP wavelength demodulation device (10) is the wavelength demodulation device based on Fabry Perot principle of interference, be can be realized to wavelength High-precision Real-time demodulation, and the wavelength information demodulated is transferred out;
The signal processor (11) receives the wavelength information of FP wavelength demodulation device (10) Real-time demodulation, by by wavelength information with The comparison of sensor (5) parameter, calculates the temperature information at each sensor (5);
It is described to temperature measurement box body (12) be simulation to thermometric space;
Wide range laser (1) generates a beam of broad spectrum laser beam, reaches paving after incident optical (2) enter 2 × 2 couplers (3) The array that constitutes of N number of sensor (5) on transmission fiber route, each sensor (5) be reflected back a specific wavelength Laser, then the output in the output optical fiber (6) after 2 × 2 couplers (3), and in the output optical fiber (6) end face through beam expanding lens (7) It expands into and expands laser beam, then collimated mirror (8) correction, form collimated laser beam, standard of the FP wavelength demodulation device (10) to output Collimated excitation beam carries out real-time Wavelength demodulation, and the wavelength information of demodulation is transferred to signal processor (11), by signal processing Machine (11) calculates the corresponding temperature value of each bragg fiber sensor (5) institute reflection wavelength, is based on sensor to realize (5) distributed temperature measuring.
2. a kind of non-contact temperature measuring device based on bragg grating according to claim 1, it is characterised in that: N number of sensor (5) is arranged using array, realizes distributed temperature measuring, Prague in N number of sensor (5) array The variation range of wavelength does not overlap within the scope of grating (5-1) measured temperature, and is distributed in the wave-length coverage of wide range laser (1) It is interior.
3. a kind of non-contact temperature measuring device based on bragg grating according to claim 1, it is characterised in that: The beam expanding lens (7), collimating mirror (8) and transparent glass (9) position are parallel to each other.
CN201810834312.0A 2018-07-26 2018-07-26 A kind of non-contact temperature measuring device based on bragg grating CN109282913A (en)

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Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5945666A (en) * 1996-05-20 1999-08-31 The United States Of America As Represented By The Secretary Of The Navy Hybrid fiber bragg grating/long period fiber grating sensor for strain/temperature discrimination
US20040071400A1 (en) * 2000-04-11 2004-04-15 Karim Haroud Fibre laser sensor
CN102175274A (en) * 2011-01-28 2011-09-07 陕西科技大学 Multi-physical quantity measurement sensing signal recognition method and device based on distributed FBG (Fiber Bragg Grating) sensors
KR20120114190A (en) * 2012-08-23 2012-10-16 전남대학교산학협력단 Multiplex physical quantity measuring method and system using optical multiple fiber bragg grating
CN103528712A (en) * 2013-10-25 2014-01-22 中国矿业大学 Method for monitoring temperature of coal mine shaft freezing wall in real time on basis of fiber bragg grating sensing
CN103644982A (en) * 2013-12-18 2014-03-19 南昌航空大学 Labview based fiber grating array sensing temperature measuring device and method
CN103759855A (en) * 2014-02-14 2014-04-30 太原理工大学 Temperature sensing system with FBG
EP3096117A1 (en) * 2015-05-21 2016-11-23 University of Limerick A temperature sensor
CN106482864A (en) * 2016-10-19 2017-03-08 山东省科学院激光研究所 A kind of temperature-controlled process, device and fiber grating sensing system

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5945666A (en) * 1996-05-20 1999-08-31 The United States Of America As Represented By The Secretary Of The Navy Hybrid fiber bragg grating/long period fiber grating sensor for strain/temperature discrimination
US20040071400A1 (en) * 2000-04-11 2004-04-15 Karim Haroud Fibre laser sensor
CN102175274A (en) * 2011-01-28 2011-09-07 陕西科技大学 Multi-physical quantity measurement sensing signal recognition method and device based on distributed FBG (Fiber Bragg Grating) sensors
KR20120114190A (en) * 2012-08-23 2012-10-16 전남대학교산학협력단 Multiplex physical quantity measuring method and system using optical multiple fiber bragg grating
CN103528712A (en) * 2013-10-25 2014-01-22 中国矿业大学 Method for monitoring temperature of coal mine shaft freezing wall in real time on basis of fiber bragg grating sensing
CN103644982A (en) * 2013-12-18 2014-03-19 南昌航空大学 Labview based fiber grating array sensing temperature measuring device and method
CN103759855A (en) * 2014-02-14 2014-04-30 太原理工大学 Temperature sensing system with FBG
EP3096117A1 (en) * 2015-05-21 2016-11-23 University of Limerick A temperature sensor
CN106482864A (en) * 2016-10-19 2017-03-08 山东省科学院激光研究所 A kind of temperature-controlled process, device and fiber grating sensing system

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