CN102878943B - The multiple sensing system of fiber strain integration calibrating installation of large scale and method - Google Patents

The multiple sensing system of fiber strain integration calibrating installation of large scale and method Download PDF

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Publication number
CN102878943B
CN102878943B CN201210222199.3A CN201210222199A CN102878943B CN 102878943 B CN102878943 B CN 102878943B CN 201210222199 A CN201210222199 A CN 201210222199A CN 102878943 B CN102878943 B CN 102878943B
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China
Prior art keywords
strain
fiber
optical fiber
scale
equi intensity
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CN201210222199.3A
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Chinese (zh)
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CN102878943A (en
Inventor
袁明
闫继送
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中国电子科技集团公司第四十一研究所
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Abstract

The application relates to the multiple sensing system of fiber strain integration calibrating installation of a kind of large scale and method, for calibrating the coefficient of strain of BOTDA, BOTDR, fiber Bragg grating (FBG) demodulator, comprise: by inspection BOTDR, by inspection BOTDA, by inspection fiber Bragg grating (FBG) demodulator, statical strain indicator, large scale equi intensity cantilever, optical fiber, the optical fiber with fiber grating, fiber grating, foil gauge, optical fiber, its action length can reach more than 1200mm, precision can reach 1 μ ε, compared with prior art, action length is long, precision is high, cost is low.

Description

The multiple sensing system of fiber strain integration calibrating installation of large scale and method

Technical field

The present invention relates to a kind of calibrating installation, be specifically related to a kind of large scale multiple sensing system of fiber strain integration calibrating installation.

Background technology

Fibre optic strain sensor is not owing to being subject to electromagnetic effect, can long-term work in the presence of a harsh environment, essential safety, highly sensitive, application in engineering also gets more and more, wherein based on the strain sensing system of BOTDR and BOTDA be present research based on the strain sensing system of fiber grating, use maximum sensing system of fiber strain, in application process, must to BOTDR, BOTDA and fiber Bragg grating (FBG) demodulator carry out strain calibration, current calibration steps is universal testing machine method mainly, it utilizes hydraulic pressure to apply stress, optical fiber is made to produce strain, precision is high, trace to the source easily, but it is expensive, general more than tens0000, and action length is shorter, general all at below 700mm, BOTDR cannot be met, the wide range alignment requirements of the fiber strain sensing checkout equipments such as BOTDA.

Summary of the invention

For above-mentioned technical matters, the invention provides a kind of integrated calibrating installation simultaneously can calibrated multiple fiber strain sensing checkout equipment, action length can reach more than 1200mm, and precision can reach 1 μ ε, compared with universal testing machine, action length is long, precision is high, cost is low.

For solving the problems of the technologies described above, the technical scheme that the present invention adopts is: a kind of large scale multiple sensing system of fiber strain integration calibrating installation, comprise: by inspection BOTDA, by inspection BOTDR, by inspection fiber Bragg grating (FBG) demodulator, statical strain indicator, large scale equi intensity cantilever, optical fiber, with the optical fiber of fiber grating, fiber grating, foil gauge, optical fiber, wherein BOTDA and Fiber connection are as BOTDA strain sensing system, BOTDR and Fiber connection are as BOTDR strain sensing system, fiber Bragg grating (FBG) demodulator forms fiber grating strain sensor system with the optical fiber with fiber grating, statical strain indicator and foil gauge form statical strain indicator strain sensing system.

The present invention utilizes calibrated statical strain indicator strain sensing system as the standard of strain calibration and benchmark, with the carrier of large scale equi intensity cantilever as strain transfer and carrying.

The invention has the beneficial effects as follows: present invention utilizes equi intensity cantilever strain evenly and statical strain indicator precision is high, easy advantage of tracing to the source, adopt equi intensity cantilever as the carrier of strain transfer and carrying, with statical strain indicator as calibration criterion, achieve and BOTDR, BOTDA, fiber grating strain sensor system are calibrated simultaneously, compared with prior art, action length of the present invention long, trace to the source easily, precision is high, cost is low.Specifically have the following advantages:

(1) action length is long, and can reach more than 1200mm, cost is lower;

(2) precision is high, can reach 1 μ ε, traces to the source easily;

(3) can calibrate BOTDR, BOTDA and fiber Bragg grating (FBG) demodulator simultaneously.

Accompanying drawing explanation

Fig. 1 is structural representation of the present invention.

By inspection BOTDA-0; By inspection BOTDR-1; By inspection fiber Bragg grating (FBG) demodulator-2; Statical strain indicator-3; Semi-girder-4; Optical fiber-5; With the optical fiber-6 of fiber grating; Fiber grating-7; Foil gauge-8; Optical fiber-9.

Embodiment

Below preferred embodiment of the present invention is described in detail, can be easier to make advantages and features of the invention be readily appreciated by one skilled in the art, thus more explicit defining is made to protection scope of the present invention.

The embodiment of the present invention comprises:

A kind of large scale multiple sensing system of fiber strain integration calibrating installation, for calibrating BOTDA, BOTDR, the coefficient of strain of fiber Bragg grating (FBG) demodulator, comprise by inspection BOTDA0, by inspection BOTDR1, by inspection fiber Bragg grating (FBG) demodulator 2, statical strain indicator 3, large scale equi intensity cantilever 4, optical fiber 5, with the optical fiber 6 of fiber grating, fiber grating 7, foil gauge 8, optical fiber 9, wherein be connected with optical fiber 9 as BOTDA strain sensing system by inspection BOTDA0, be connected with optical fiber 5 as BOTDR strain sensing system by inspection BOTDR1, fiber grating strain sensor system is formed with the optical fiber 6 with fiber grating by inspection fiber Bragg grating (FBG) demodulator 2, statical strain indicator 3 and foil gauge 8 form statical strain indicator strain sensing system.

The present invention utilizes calibrated statical strain indicator strain sensing system as the standard of strain calibration and benchmark, with the carrier of large scale equi intensity cantilever 4 as strain transfer and carrying.

The detailed description of the invention is as follows:

As shown in Figure 1, optical fiber 5, optical fiber 9 and the optical fiber 6 with fiber grating are pasted onto on the axis of large scale equi intensity cantilever 4 closely, the near axis that foil gauge 8 is pasted onto large scale equi intensity cantilever 4 is distributed symmetrically, and upper and lower surface stickup quantity is identical, the paste position also one_to_one corresponding of its upper and lower surface.Optical fiber 5, optical fiber 9 and with the optical fiber 6 of fiber grating and foil gauge 8 paste position as shown in Figure 1.In using, foil gauge 8 must closely be pasted onto in pairs large scale equi intensity cantilever 4 vertically on the surface, optical fiber 5, optical fiber 9, to be pasted onto side by side on the axis of large scale equi intensity cantilever 4 with the optical fiber 6 of fiber grating.Optical fiber 5 is subject to inspection BOTDR for access; Optical fiber 9 is subject to inspection BOTDA (also can only enter by inspection BOTDR by one termination) for access; Optical fiber 6 with fiber grating is subject to inspection fiber Bragg grating (FBG) demodulator 2 for access.

In calibration process, calibrating installation is positioned in horizontal table top, apply power straight down at the top of large scale equi intensity cantilever 4, apply evenly equal strain by the flexibility changing large scale equi intensity cantilever 4 to all each strain transducers be fixed on large scale equi intensity cantilever 4.Change the intensity that large scale equi intensity cantilever 4 top is stressed, can change the size that equi intensity cantilever 4 strains, the size of strain is tested by statical strain indicator and is provided.

The foregoing is only embodiments of the invention; not thereby the scope of the claims of the present invention is limited; every utilize description of the present invention to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.

Claims (2)

1. a large scale multiple sensing system of fiber strain integration calibrating installation, for calibrating BOTDA, BOTDR, the coefficient of strain of fiber Bragg grating (FBG) demodulator, it is characterized in that: this device comprises by inspection BOTDA (0), by inspection BOTDR (1), by inspection fiber Bragg grating (FBG) demodulator (2), statical strain indicator (3), large scale equi intensity cantilever (4), first optical fiber (5), with the optical fiber (6) of fiber grating, fiber grating (7), foil gauge (8), second optical fiber (9), wherein BOTDA (0) is connected as BOTDA strain sensing system with the second optical fiber (9), BOTDR (1) is connected as BOTDR strain sensing system with the first optical fiber (5), fiber Bragg grating (FBG) demodulator (2) forms fiber grating strain sensor system with the optical fiber (6) with fiber grating, statical strain indicator (3) and foil gauge (8) form statical strain indicator strain sensing system, utilize calibrated described statical strain indicator strain sensing system as the standard of strain calibration and benchmark, with the carrier of described large scale equi intensity cantilever (4) as strain transfer and carrying,
Foil gauge (8) be pasted onto in pairs large scale equi intensity cantilever (4) vertically on the surface, and the near axis that foil gauge (8) is pasted onto large scale equi intensity cantilever (4) distributes symmetrically, and upper and lower surface stickup quantity is identical, the paste position also one_to_one corresponding of its upper and lower surface; First optical fiber (5), the second optical fiber (9), to be pasted onto side by side on the axis of large scale equi intensity cantilever (4) with the optical fiber (6) of fiber grating.
2. the using method of device described in claim 1, described calibrating installation is positioned in horizontal table top, power is straight down applied at the top of large scale equi intensity cantilever (4), evenly equal strain is applied to all each strain transducers be fixed on large scale equi intensity cantilever (4) by the flexibility changing large scale equi intensity cantilever (4), change the intensity that large scale equi intensity cantilever (4) top is stressed, can change the size that equi intensity cantilever (4) strains, the size of strain is tested by statical strain indicator and is provided.
CN201210222199.3A 2012-06-27 2012-06-27 The multiple sensing system of fiber strain integration calibrating installation of large scale and method CN102878943B (en)

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CN103335603B (en) * 2013-06-27 2016-03-16 中国电子科技集团公司第四十一研究所 A kind of distributive fiber optic strain factor calibration device and scaling method
CN104729418A (en) * 2013-12-20 2015-06-24 中国计量学院 Calibration device and method for fiber grating high temperature strain transducer
CN107036543A (en) * 2015-10-14 2017-08-11 北京信息科技大学 A kind of fiber Bragg grating strain sensor demarcation and fatigue detecting system
CN105571619B (en) * 2015-12-17 2017-10-10 安徽中科智泰光电测控科技有限公司 A kind of FBG sensor sensitivity improvement methods based on cantilever beam structure
CN106017532B (en) * 2016-05-16 2018-03-30 中国电子科技集团公司第二十三研究所 A kind of calibrating installation and calibration method for light phase (FBG) demodulator
CN106225704B (en) * 2016-07-12 2018-01-12 北京航空航天大学 A kind of adaptive location choosing method for FBG structure detection
CN106802133A (en) * 2016-11-02 2017-06-06 北京信息科技大学 Data processing method, data handling system and strain gauge means
CN109470403A (en) * 2018-12-14 2019-03-15 北京航空航天大学 A kind of power based on fiber grating/torque sensor scaling method

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