CN104062363B - A kind of double optical fiber grating sensor for Detection of Bolt Bonding Integrity detection - Google Patents
A kind of double optical fiber grating sensor for Detection of Bolt Bonding Integrity detection Download PDFInfo
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- CN104062363B CN104062363B CN201410280674.1A CN201410280674A CN104062363B CN 104062363 B CN104062363 B CN 104062363B CN 201410280674 A CN201410280674 A CN 201410280674A CN 104062363 B CN104062363 B CN 104062363B
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Abstract
The invention discloses a kind of double optical fiber grating sensor for Detection of Bolt Bonding Integrity detection, clip including an annular shell clamping termination point of anchor rod, it is provided with one piece of elastomer block I along anchor pole axial direction one end on clip inwall, the other end is provided with elastomer block II, a sensing grating is placed in described elastomer block I, in described elastomer block II, place a matched FBG being in free state, and the Bragg grating parameter of sensing grating, matched FBG is identical；Two gratings are positioned on same optical fiber and are separated by the distance of setting, and described optical fiber passes clip, is connected with data processing equipment；After termination point of anchor rod excites elastic wave, when the elastic wave propagated along anchor bar body or the elastic wave through reflecting act on sensing grating, the skew of sensing grating reflectance spectrum centre wavelength can be caused, through demodulation and the process of data with the light intensity of the overlapping region of matched FBG reflectance spectrum, obtain time domain or the frequency domain characteristic of elastic wave signal.
Description
Technical field
The invention discloses a kind of double optical fiber grating sensor for Detection of Bolt Bonding Integrity detection.
Background technology
Anchor pole uses in the engineerings such as highway, railway, mine, civil construction in a large number, is mainly used in slope reinforcement and underground support.
In anchor rod anchored technology, anchor pole embeds the length in rock and can the mortar saturation between anchor pole and rock be to evaluate anchor pole send out
Wave the key of its maximum utility, therefore these two technical specifications are evaluated be Detection of Bolt Bonding Integrity detection main task.Pass
The Detection of Bolt Bonding Integrity detection method of system is pull-out test method and core sample method, although this method is directly perceived, but the method is a kind of broken
Bad property detects, and there is significant limitation.Grow up subsequently has strain ga(u)ge formula, differential resistance strain gage, string wire
A few class sensors such as formula and flat jack formula, these electrical category sensitive components use the most in a large number, and existing ripe technology, especially
It is that the long-time stability of strain ga(u)ge, temperature drift, zero point stability and long range propagation problem are preferably solved.But this
A little sensors still suffer from the problems such as protection against the tide, waterproof, interference free performance is poor, it is impossible to meet engineering very well detects needs in real time.Light
Fine Prague (Bragg) grating sensor has the advantages such as electromagnetism interference, size are little and lightweight, is substantially to utilize strain
Change causes reflecting light length to change, and external environment is the least on the impact of wavelength, therefore fiber-optic grating sensor becomes industry in recent years
The focus of boundary's research.For fiber bragg grating device make sensor have some research reports, as Wuhan University of Technology Jiang Desheng,
Nan Qiuming etc. use adhesive type fiber-optic grating sensor that prestressed anchor stress in the bar carries out distribution and long-term detection；Xi'an Technology University
Chai Jing, Li Yi et al. have developed the optical fiber grating anchor ergometer with temperature-compensating；These sensors are all by executing anchor pole
Then Prestressing utilizes grating to carry out stress mornitoring, belongs to the measurement of static force, and certainty of measurement is high, and the linearity is preferable, but knot
Structure is relative complex and has certain destructiveness.
Summary of the invention
For above-mentioned deficiency, the invention discloses a kind of simple in construction, easy for installation, destructive little, it is thus achieved that signal enriches, temperature
Degree self compensation, highly sensitive, can realize kinetic measurement Detection of Bolt Bonding Integrity detection double optical fiber grating sensor.
The technical solution used in the present invention is as follows:
A kind of double optical fiber grating sensor for Detection of Bolt Bonding Integrity detection, including an annular shell clamping termination point of anchor rod
Clip, clip inwall is provided with one piece of elastomer block I along anchor pole axial direction one end, the other end is provided with hollow elasticity block II, in institute
Placing a sensing grating in groove in elastomer block I stated, in described elastomer block II, vacancy is placed one and is in free state
Matched FBG, and the Fiber Bragg Grating FBG parameter of sensing grating, matched FBG is identical；Two gratings are positioned at same optical fiber
Going up and be separated by the distance of setting, described optical fiber one end passes clip, is connected with demodulation light path and display device；At termination point of anchor rod
After exciting elastic wave, when the elastic wave propagated or the elastic wave through reflecting act on sensing grating, can cause along anchor bar body
The skew of sensing grating reflectance spectrum centre wavelength, through with the demodulation of the light intensity of the overlapping region of matched FBG reflectance spectrum and
The process of data, obtains time domain or the frequency domain characteristic of elastic wave signal.
Described demodulation light path and display device include light source, bonder, optical-electrical converter and oscillograph, drawing of described optical fiber
Going out end and connect an outfan of bonder, an input of bonder connects light source, and another reflection input connects photoelectricity
Transducer, described optical-electrical converter is connected with oscillograph.
Described sensing grating sticks in the groove within elastomer block I.
Described elastomer block I, elastomer block II are the most firmly pasted on clip inwall.
Described matched FBG is freely placed under the protection of hollow elasticity block II, is not stressed.
Described elastomer block I is used for the elastic wave of perception anchor pole, and by elastic wave indirect action on sensing grating.
Said two grating is same parameter, and on an optical fiber, processing is scribed and formed, and space retains distance, is used for ensureing two
Fiber Bragg Grating FBG is placed in two pieces of elastomers.
In order to sensitiveer detects signal, the grid length of two gratings is less than the accumulation signal of applying and propagates wavelength in anchor pole
Half；
Described match grating pairs sensing grating has temperature, disturbance compensation effect.
On same described optical fiber, two gratings are intensity demodulation principle, when the centre wavelength of sensing grating occurs skew, pass
The reflectance spectrum of photosensitive grid changes with the area of the reflectance spectrum lap of matched FBG, i.e. light intensity changes, and finally turns
Change the signal of telecommunication into just to change, to show on oscillograph.
The present invention uses said structure, after termination point of anchor rod excites elastic wave, and the elastic wave propagated along anchor bar body or process reflection
Elastic wave when acting on sensing grating, the skew of sensing grating reflectance spectrum centre wavelength can be caused, through and matched FBG
The demodulation of the light intensity of the overlapping region of reflectance spectrum, and the display of later data and process, obtain elastic wave signal time domain or
Frequency domain characteristic, the analysis for Detection of Bolt Bonding Integrity provides strong foundation.
Beneficial effects of the present invention is as follows:
Although the present invention is also adopted by fiber bragg grating device, but by experiencing the method for the stress reflexion ripple that exciting causes rather than straight
Connect the power being applied on anchor pole, and before and after using, two FBG devices of the same parameter realize, and utilize two FBG reflectance spectrum weights
The energy in folded region measures Detection of Bolt Bonding Integrity indirectly, belongs to intensity demodulation.Measurement structure use FBG be easiest to sensitivity
Axial direction, it is ensured that cause the stress deformation of elastic structure, and cause to become between the change that FBG reflectance spectrum waveform drifts about
Essence linear relationship.And use the grating that two parameters are identical, temperature impact and external disturbance can be eliminated.
Accompanying drawing explanation
Fig. 1 present invention is implementing the structure chart of state；
Fig. 2 inventive sensor part-structure figure；
In figure: 1 rock, 2 clips, 3 anchor poles, 4, fiber-optic wire, 5 elastomer block I, 6 sensing gratings, 7 elastomer block II,
8 matched FBG.
Detailed description of the invention
The present invention is described in detail below in conjunction with the accompanying drawings:
For the double optical fiber grating sensor of Detection of Bolt Bonding Integrity detection, anchor pole 3 end being located in rock 1 can be clamped including one
The clip 2 of the annular shell of head, clip 2 inwall is pasted one piece of elastomer block I5 along the axial side of anchor pole, and opposite side pastes one piece
Elastomer block II7 of the hollow suitable with elastomer block I5 size, sensing grating 6 is positioned in the groove of elastomer block I5, matched FBG 8
Being positioned over elastomer block II7 hollow space and be in free state, two Fiber Bragg Grating FBG parameters are identical, are phases on an optical fiber
Scribe processing away from a segment distance by ultraviolet, after this root optical fiber draws clip by fiber-optic wire 4, connect demodulation light path and show
Showing device；This device includes light source, bonder, optical-electrical converter and oscillograph, and the exit of optical fiber connects the output of bonder
End, an input of bonder connects light source, and another reflection input connects optical-electrical converter, described optical-electrical converter
It is connected with oscillograph.
Sensor reception exciting hand hammer puts on the accumulation signal of termination point of anchor rod, the sensing grating in elastomer block I5 that is laid in groove
Sealing with glue, then elastomer block I5 perception elastic wave acts on sensing grating.Matched FBG under the protection of elastomer block II7 from
By placing, from pressure.Two pieces of elastomer block are the most firmly pasted on clip 2 inwall.
Two Fiber Bragg Grating FBGs are same parameter, and on an optical fiber, processing is scribed and formed, and space retains certain distance, uses
Ensure that two Fiber Bragg Grating FBGs are placed in elastomer block I5, elastomer block II7.
In order to sensitiveer detects signal, the grid length of two gratings is less than the accumulation signal of applying and propagates wavelength in anchor pole
Half；
Matched FBG 8 also has the compensating actions such as certain temperature, disturbance.
On same optical fiber, two gratings are intensity demodulation.
The present invention uses said structure, after anchor pole 3 termination excites elastic wave, and the elastic wave propagated along anchor pole 3 body or process
When the elastic wave of reflection acts on sensing grating 6, the skew of sensing grating 6 reflectance spectrum centre wavelength, Jing Guoyu can be caused
The demodulation of the light intensity of the overlapping region of matched FBG 8 reflectance spectrum, and the process of later data, obtain elastic wave signal time
Territory or frequency domain characteristic, the analysis for Detection of Bolt Bonding Integrity provides strong foundation.
Claims (5)
1. the double optical fiber grating sensor for Detection of Bolt Bonding Integrity detection, it is characterized in that: include the clip of an annular shell clamping termination point of anchor rod, it is provided with one piece of elastomer block I along anchor pole axial direction one end on clip inwall, the other end is provided with hollow elasticity block II, a sensing grating is placed in groove in described elastomer block I, in described elastomer block II, a matched FBG being in free state is placed in vacancy, and the Fiber Bragg Grating FBG parameter of sensing grating, matched FBG is identical；Two gratings are positioned on same optical fiber and are separated by the distance of setting, and described optical fiber one end passes clip, is connected with demodulation light path and display device；After termination point of anchor rod excites elastic wave, when the elastic wave propagated along anchor bar body or the elastic wave through reflecting act on sensing grating, the skew of sensing grating reflectance spectrum centre wavelength can be caused, through demodulation and the process of data with the light intensity of the overlapping region of matched FBG reflectance spectrum, obtain time domain or the frequency domain characteristic of elastic wave signal；
Described matched FBG is freely placed under the protection of elastomer block II, is not stressed；
Described elastomer block I is used for the elastic wave of perception anchor pole, and by elastic wave indirect action on sensing grating.
2. the double optical fiber grating sensor for Detection of Bolt Bonding Integrity detection as claimed in claim 1, it is characterized in that: described demodulation light path and data presentation device include a light source, bonder, optical-electrical converter and oscillograph, the exit of described optical fiber connects the outfan of bonder, one input of bonder connects light source, another reflection input connects optical-electrical converter, and described optical-electrical converter is connected with oscillograph.
3. the double optical fiber grating sensor for Detection of Bolt Bonding Integrity detection as claimed in claim 1, it is characterised in that: described sensing grating sticks in the groove within elastomer block I.
4. the double optical fiber grating sensor for Detection of Bolt Bonding Integrity detection as claimed in claim 1, it is characterised in that: described elastomer block I, elastomer block II are the most firmly pasted on clip inwall.
5. the double optical fiber grating sensor for Detection of Bolt Bonding Integrity detection as claimed in claim 1, it is characterised in that: the grid length of said two grating is less than the accumulation signal of applying and propagates the half of wavelength in anchor pole.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410280674.1A CN104062363B (en) | 2014-06-20 | 2014-06-20 | A kind of double optical fiber grating sensor for Detection of Bolt Bonding Integrity detection |
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| CN201410280674.1A CN104062363B (en) | 2014-06-20 | 2014-06-20 | A kind of double optical fiber grating sensor for Detection of Bolt Bonding Integrity detection |
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| CN104062363A CN104062363A (en) | 2014-09-24 |
| CN104062363B true CN104062363B (en) | 2016-08-17 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104267101B (en) * | 2014-10-23 | 2016-12-07 | 吉林大学 | Optical fiber acoustic scenograph |
| CN108760109B (en) * | 2018-03-22 | 2020-11-24 | 湖北省路桥集团有限公司 | Variable-range soil pressure measuring device and method based on Bragg fiber grating |
| CN109632075B (en) * | 2019-01-28 | 2020-11-24 | 武汉理工大学 | Vibration monitoring system and method based on double fiber bragg grating arrays |
| CN110044463B (en) * | 2019-04-28 | 2021-05-07 | 陕西师范大学 | Sensing structure based on optical fiber sensing |
| CN110531110B (en) * | 2019-08-14 | 2021-09-03 | 武汉理工大学 | FBG two-dimensional acceleration sensor based on U-shaped groove structure and measuring method thereof |
| CN114277792B (en) * | 2022-01-06 | 2022-10-14 | 江苏科技大学 | Self-expanding anchor rod capable of monitoring resistivity of soil body and construction method thereof |
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| US6854327B2 (en) * | 2002-11-06 | 2005-02-15 | Shell Oil Company | Apparatus and method for monitoring compaction |
| CN102809454A (en) * | 2012-06-29 | 2012-12-05 | 山东大学 | FBG (Fiber Bragg Grating) force measuring anchor rod and using method |
| CN202690096U (en) * | 2012-06-29 | 2013-01-23 | 山东大学 | Fiber bragg grating force-measuring anchor rod |
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2014
- 2014-06-20 CN CN201410280674.1A patent/CN104062363B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6854327B2 (en) * | 2002-11-06 | 2005-02-15 | Shell Oil Company | Apparatus and method for monitoring compaction |
| CN102809454A (en) * | 2012-06-29 | 2012-12-05 | 山东大学 | FBG (Fiber Bragg Grating) force measuring anchor rod and using method |
| CN202690096U (en) * | 2012-06-29 | 2013-01-23 | 山东大学 | Fiber bragg grating force-measuring anchor rod |
Non-Patent Citations (2)
| Title |
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| FBG传感器在隧道锚杆支护结构监测中的应用研究;武胜军 等;《传感器与微系统》;20071231;第26卷(第12期);31-34 * |
| 光纤光栅锚杆传感在隧道应变监测中的技术研究;蒋奇 等;《岩土力学》;20061031;第27卷;315-319 * |
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