CN202748010U - Pavement structure stress and strain gauge based on fiber bragg grating - Google Patents

Pavement structure stress and strain gauge based on fiber bragg grating Download PDF

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Publication number
CN202748010U
CN202748010U CN 201220308238 CN201220308238U CN202748010U CN 202748010 U CN202748010 U CN 202748010U CN 201220308238 CN201220308238 CN 201220308238 CN 201220308238 U CN201220308238 U CN 201220308238U CN 202748010 U CN202748010 U CN 202748010U
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China
Prior art keywords
bragg grating
fiber bragg
demodulator
fiber
optical fiber
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Expired - Fee Related
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CN 201220308238
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Chinese (zh)
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翁效林
朱鸿鹄
刘保健
马豪豪
姚贝贝
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Changan University
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Changan University
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Abstract

The utility model discloses a pavement structure stress and strain gauge based on fiber bragg grating. The gauge comprises a fiber bragg grating demodulator, a fiber Bragg grating sensor, an armoured fiber and a mobile computer, wherein the fiber bragg grating demodulator comprises a laser, a photo-detector and a coupler. The laser and the photo-detector are respectively connected with the coupler; the fiber Bragg grating sensor is fused with the armoured fiber; the fiber Bragg grating sensor is connected with the coupler in the fiber bragg grating demodulator through an FC jumper wire; the photo-detector in the fiber bragg grating demodulator is connected with the mobile computer; the fiber bragg grating demodulator belongs to an SM130 fiber demodulator; and the length of the fiber Bragg grating sensor is 50mm and the diameter of the fiber Bragg grating sensor is 5mm. The pavement structure stress and strain gauge based on fiber bragg grating has the advantages of being high in sensitivity and resolution, being convenient in operation, being low in cost, being able to realize automatic detection, and filling the gap of the conventional strain monitoring technology.

Description

Pavement structure stress strain guage based on fiber grating
Technical field
The utility model belongs to the pavement structure technical field of measurement and test, is specifically related to a kind of pavement structure stress strain guage based on fiber grating.
Background technology
Bridge, dam and road surface isostructural build and the operation process in, the monitoring of concrete ess-strain is a very important job.Control section to structure is monitored, and can in time understand the structural health situation, guarantee structural safety, and keeping in repair for construction, operation and the reinforcing of structure provides foundation.Concrete stress test more complicated, common way are to measure concrete strain by strainometer indirectly to measure concrete stress.Strain commonly used is several in respect of electric resistance wire strain gauge, differential type strainometer and vibrating string extensometer etc. at present, wherein, vibrating string extensometer has the advantages such as good stability, antijamming capability is strong, data acquisition is convenient, it is the strainometer that is most widely used at present, but this strainometer sensitivity is poor, resolution is low, and measured data all must carry out could reflecting concrete stress and strain after the analyzing and processing; The road surface structure layers such as highway are generally thinner, and the vibrating string extensometer size is larger, are not suitable for monitoring the strain of pavement structure.
Summary of the invention
Defective or deficiency for above-mentioned prior art existence, the purpose of this utility model is, a kind of pavement structure stress strain guage based on fiber grating is provided, this device sensitivity is high, resolution is high, simple in structure, easy to operate, cost is low, can realize automatic detection, has filled up the blank of existing strain monitoring technology.
In order to achieve the above object, the utility model adopts following technical solution:
A kind of pavement structure stress strain guage based on fiber grating, comprise fiber Bragg grating (FBG) demodulator, optical fiber Bragg grating sensor, armored fiber optic and removable computer, wherein, described fiber Bragg grating (FBG) demodulator comprises laser instrument, photo-detector, coupling mechanism, and described laser instrument, photo-detector be the butt coupling device respectively; Described optical fiber Bragg grating sensor and the welding of armored fiber optic phase, optical fiber Bragg grating sensor is connected with coupling mechanism in the fiber Bragg grating (FBG) demodulator by the FC wire jumper, and the photo-detector in the fiber Bragg grating (FBG) demodulator is connected with removable computer.
Described fiber Bragg grating (FBG) demodulator adopts SM130 type optical fiber (FBG) demodulator.
Described optical fiber Bragg grating sensor length is 50mm, and diameter is 5mm.
Described armored fiber optic adopts the indoor armored fiber optic of single core.
Advantage of the present utility model is as follows:
Maximum characteristics of the present utility model and advantage are that size sensor is very little, can satisfy the specific (special) requirements of pavement structure strain testing, and install, test road pavement structure influence is very little, almost can ignore.Compare with traditional strainometer, Fibre Optical Sensor except little, lightweight, corrosion-resistant, the anti-electrical measurement of size disturb, safe and reliable, simple to operate, also have following characteristics: 1) resolution is high, considerably beyond vibrating string extensometer; 2) Fibre Optical Sensor belongs to the wavelength-modulated type, and anti-thousand to disturb ability strong; 3) have natural coupling with optical fiber, integrate " biography " with " sense " and have stronger multiplexing capacity, be easy to consist of quasi-distributed sensor network; 4) measuring object is extensive, is easy to realize the Multi-parameter sensing measurement.5) reusable, be easy to the protection and the maintenance, can realize long term monitoring, long-time stability are good, long distance of signal transmission.
Description of drawings
Fig. 1 is connection block diagram of the present utility model.
Fig. 2 is sensor scheme of installation on pavement structure to be measured.
Fig. 3 is the temperature sensing family curve of optical fiber Bragg grating sensor.
Below in conjunction with the drawings and specific embodiments the utility model is further explained.
Embodiment
As shown in Figure 1, pavement structure stress strain guage based on fiber grating of the present utility model, comprise fiber Bragg grating (FBG) demodulator 1, optical fiber Bragg grating sensor 5, armored fiber optic (conduction optical fiber) 6 and removable computer 8, wherein, described fiber Bragg grating (FBG) demodulator 1 comprises laser instrument 2, photo-detector 3, coupling mechanism 4, and described laser instrument 2, photo-detector 3 be butt coupling device 4 respectively; Described optical fiber Bragg grating sensor 5 adopts the welding of optical fiber splicer phase with armored fiber optic 6, optical fiber Bragg grating sensor 5 is connected with coupling mechanism 4 in the fiber Bragg grating (FBG) demodulator 1 by FC wire jumper 9, and the photo-detector 3 in the fiber Bragg grating (FBG) demodulator 1 is connected with removable computer 8.Removable computer 8 is by the strain variation of the optical fiber Bragg raster demodulation software Real-Time Monitoring optical fiber Bragg grating sensor 5 himself installed.
Fiber Bragg grating (FBG) demodulator 1: adopt SM130 type optical fiber (FBG) demodulator, its detection to the movement of optic fiber grating wavelength has reached the high resolving power of micromicron magnitude, therefore has the highly sensitive characteristics of measuring.In the data monitoring process, the position that only need to detect grating wavelength distribution plan medium wave peak gets final product, and is insensitive to the fluctuation of light intensity, therefore has higher antijamming capability than traditional sensors.Individual in measuring process, the impact of temperature is larger, need to carry out temperature compensation.Compensation method is to bury a temperature compensation grating in monitoring underground in the highway section, and this grating is not subjected to the pavement strain variable effect, and temperature influence only.
Optical fiber Bragg grating sensor 5: adopt quartzy position phase formula transmission grating, be made by phase masks, also can adopt existing grating sensor, the optical fiber Bragg grating sensor of producing such as MO company; The size of optical fiber Bragg grating sensor 5 and package design thereof: grating length is 20mm, and core diameter 9 μ m, covering external diameter are 125 μ m, coat external diameter 250 μ m.Through the optical fiber Bragg grating sensor 5 length 50mm after the fine steel tube encapsulation, diameter 5mm is connected by the optical fiber bonding machine with conduction optical fiber 6, and the FC wire jumper is installed at two ends.Should be noted that during fine steel tube packaged fiber grating that fiber grating needs the accurately straight middle that is placed on fine steel tube, the fine steel tube material must have corrosion resistance, fatigue resistence, and elastic range is wide, and is good with matrix material cohesiveness.Should be noted that tackifier need to be applicable to optical fiber and stainless adhesive property, need to have higher shearing strength and permanance when selecting tackifier.Bubble can not occur in the tackifier, otherwise tackifier can make fiber grating produce nonaffine deformation after solidifying, and affects reflection at peak.
Armored fiber optic (conduction optical fiber) 6: adopt the indoor armored fiber optic of single core, its structure is: optical fiber+aramid fiber (playing drawing-resistant function)+stainless steel flexible hose (playing resistance to compression, counter-bending, mouse bite preventing)+stainless steel braided wires (rising antitorque)+oversheath (using PVC).
Referring to Fig. 2, carry out the pavement structure of strain testing slots at needs, installing optical fibres Bragg grating sensor 5, the size view sensor of groove and the size of armored fiber optic and decide, and satisfy the construction demand, the route of fluting is as far as possible straight, and the turning point adopts camber line to turn, avoid occurring the right angle, in order to avoid optical fiber fractures.After the optical fiber laying was complete, grating partly adopted the inner tackifier of filling of hollow steel pipe to be fixed on bottom land protection.A plurality of optical fiber Bragg grating sensors 5 are by the reflected light wavelength (λ of different fiber grating 1, λ 2λ 3λ n) and treat geodesic structure each measurement point (1,2,3 along the line ... n) corresponding one by one, the test structure ess-strain of each point that distributes along the line respectively.
In using, the engineering of optical fiber Bragg raster must consider to eliminate the impact of temperature.The Changing Pattern of optical fiber Bragg raster centre wavelength when adopting the temperature characterisitic experiment to obtain temperature variation.Freely unsettled putting into fine steel tube at the optical fiber Bragg raster that inclinometer pipe uses, fine steel tube sticks with glue agent and is fixed on the substrate test specimen.Simultaneously near optical fiber Bragg raster, place thermopair, then put into together the insulation can of sealing.Electromagnetic oven is placed as thermal source in the insulation can bottom.Optical fiber Bragg raster connects (FBG) demodulator record grating center wavelength variation, and thermopair connects thermometer record temperature variation.One of measurement result as shown in figure 12.As can be seen from the figure, the centre wavelength of optical fiber Bragg raster and temperature have good linear relationship, have good repeatability.Centre wavelength is the grating of 1549.74nm, 1 ℃ of the every variation of temperature, raster center wavelength variations 10.9pm.Can to obtain 1 ℃ of raster center wavelength variations of temperature variation be 11.6pm in theoretical calculating according to temperature sensing.It is better that presentation of results trial value and theoretical value meet, and error only is 6.03%.The generation of error may be relevant with the precision of the test unit that adopts.
The measuring method of temperature variation is: after the laying optical fiber Bragg grating sensor 5, lay electronic thermometer at the same position of each optical fiber Bragg grating sensor 5 on inclinometer pipe, guarantee that both temperature are identical.Then in measuring optical fiber Bragg raster center wavelength variations each time, measure temperature variation.The center wavelength variation amount that strain causes is: Δ λ B ε=Δ λ B-K TΔ T t, wherein, Δ λ BTotal variation for optical fiber Bragg raster centre wavelength.

Claims (4)

1. pavement structure stress strain guage based on fiber grating, it is characterized in that, comprise fiber Bragg grating (FBG) demodulator (1), optical fiber Bragg grating sensor (5), armored fiber optic (6) and removable computer (8), wherein, described fiber Bragg grating (FBG) demodulator (1) comprises laser instrument (2), photo-detector (3), coupling mechanism (4), and described laser instrument (2), photo-detector (3) be butt coupling device (4) respectively; Described optical fiber Bragg grating sensor (5) and armored fiber optic (6) phase welding, optical fiber Bragg grating sensor (5) is connected with coupling mechanism (4) in the fiber Bragg grating (FBG) demodulator (1) by FC wire jumper (9), and the photo-detector (3) in the fiber Bragg grating (FBG) demodulator (1) is connected with removable computer (8).
2. the pavement structure stress strain guage based on fiber grating as claimed in claim 1 is characterized in that, described fiber Bragg grating (FBG) demodulator (1) adopts SM130 type optical fiber (FBG) demodulator.
3. the pavement structure stress strain guage based on fiber grating as claimed in claim 1 is characterized in that, described optical fiber Bragg grating sensor (5) length is 50mm, and diameter is 5mm.
4. the pavement structure stress strain guage based on fiber grating as claimed in claim 1 is characterized in that, described armored fiber optic (6) adopts the indoor armored fiber optic of single core.
CN 201220308238 2012-06-28 2012-06-28 Pavement structure stress and strain gauge based on fiber bragg grating Expired - Fee Related CN202748010U (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103604540A (en) * 2013-11-13 2014-02-26 中铁四局集团第一工程有限公司 Photoelectric stressometer
CN104819791A (en) * 2015-04-22 2015-08-05 武汉科技大学 Fiber bragg grating sensor for measuring contact stress at rolling interface
CN107389254A (en) * 2017-08-24 2017-11-24 武汉科技大学 Tire road surface three axis force measurement apparatus and its measuring method
CN108592813A (en) * 2018-08-09 2018-09-28 长安大学 A kind of Excavation Deformation of Deep Foundation Pits real-time monitoring device
CN108592855A (en) * 2018-04-28 2018-09-28 中国民航大学 A kind of airfield pavement lower part excavation deformation monitoring device based on BOTDA sensing technologies
CN109507453A (en) * 2018-12-06 2019-03-22 广州广电计量检测股份有限公司 A kind of revolving speed calibration system and calibration method based on fiber grating

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103604540A (en) * 2013-11-13 2014-02-26 中铁四局集团第一工程有限公司 Photoelectric stressometer
CN103604540B (en) * 2013-11-13 2015-06-10 中铁四局集团第一工程有限公司 Photoelectric stressometer
CN104819791A (en) * 2015-04-22 2015-08-05 武汉科技大学 Fiber bragg grating sensor for measuring contact stress at rolling interface
CN104819791B (en) * 2015-04-22 2017-10-31 武汉科技大学 A kind of fiber-optic grating sensor for measuring contact stress at Interface of Rolling
CN107389254A (en) * 2017-08-24 2017-11-24 武汉科技大学 Tire road surface three axis force measurement apparatus and its measuring method
CN108592855A (en) * 2018-04-28 2018-09-28 中国民航大学 A kind of airfield pavement lower part excavation deformation monitoring device based on BOTDA sensing technologies
CN108592813A (en) * 2018-08-09 2018-09-28 长安大学 A kind of Excavation Deformation of Deep Foundation Pits real-time monitoring device
CN109507453A (en) * 2018-12-06 2019-03-22 广州广电计量检测股份有限公司 A kind of revolving speed calibration system and calibration method based on fiber grating

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