CN204028044U - A kind of double optical fiber grating sensor detecting for Detection of Bolt Bonding Integrity - Google Patents
A kind of double optical fiber grating sensor detecting for Detection of Bolt Bonding Integrity Download PDFInfo
- Publication number
- CN204028044U CN204028044U CN201420332978.3U CN201420332978U CN204028044U CN 204028044 U CN204028044 U CN 204028044U CN 201420332978 U CN201420332978 U CN 201420332978U CN 204028044 U CN204028044 U CN 204028044U
- Authority
- CN
- China
- Prior art keywords
- grating
- optical fiber
- elastomer block
- elastic wave
- detection
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Optical Transform (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
The utility model discloses a kind of double optical fiber grating sensor detecting for Detection of Bolt Bonding Integrity, comprise a clip of clamping the annular shell of termination point of anchor rod, on clip inwall, be provided with an elastomer block I along anchor pole axial direction one end, the other end is provided with elastomer block II, in described elastomer block I, place a sensing grating, in described elastomer block II, place a coupling grating in free state, and sensing grating, coupling grating Bragg grating parameter identical; Two gratings are positioned on same optical fiber and the distance of setting of being separated by, and described optical fiber passes clip, is connected with data processing equipment; Excite after elastic wave at termination point of anchor rod, while acting on sensing grating along the elastic wave of the elastic wave of propagating in anchor bar body or process reflection, can cause the skew of sensing grating reflectance spectrum centre wavelength, through with the demodulation of light intensity and the processing of data of overlapping region of mate optical grating reflection and composing, obtain time domain or the frequency domain characteristic of elastic wave signal.
Description
Technical field
The utility model discloses a kind of double optical fiber grating sensor detecting for Detection of Bolt Bonding Integrity.
Background technology
Anchor pole uses in a large number in the engineerings such as highway, railway, mine, civil construction, is mainly used in slope reinforcement and underground support.In anchor rod anchored technology, anchor pole embeds the length in rock and the mortar saturation degree between anchor pole and rock is the key that can evaluation anchor pole bring into play its maximum utility, is therefore main tasks that Detection of Bolt Bonding Integrity detects to these two technical indicator evaluations.Traditional Detection of Bolt Bonding Integrity detection method is pull-out test method and gets core method, although this method is directly perceived, the method is a kind of destructive detection, has significant limitation.What grow up subsequently has a few class sensors such as strain ga(u)ge formula, differential resistance strain gage, steel chord type and flat jack formula, these electrical category sensitive components use in a large number, and the long-time stability of existing proven technique, especially strain ga(u)ge, temperature drift, zero point stability and long Distance Transmission problem are solved preferably.But these sensors still exist the problems such as protection against the tide, waterproof, interference free performance be poor, can not finely meet the real-time detection needs of engineering.Optical fiber Bragg (Bragg) grating sensor has the advantages such as anti-electromagnetic interference (EMI), size be little and lightweight, to utilize strain variation to cause that reflected light wavelength changes in essence, external environment is very little on the impact of wavelength, therefore fiber-optic grating sensor becomes the focus of industry research in recent years.The sensor of making for fiber bragg grating device has some research reports, as the use adhesive type fiber-optic grating sensors such as the Jiang Desheng of Wuhan University of Technology, Nan Qiuming distribute to prestressed anchor stress in the bar and detect for a long time; The people such as Xi'an Technology University's bavin is respected, Li Yi have developed the optical fiber grating anchor ergometer with temperature compensation; These sensors are all then to utilize grating to carry out stress detection by anchor pole being applied to prestress, belong to static force measurement, and measuring accuracy is high, and the linearity is better, but structure relative complex and there is certain destructiveness.
Utility model content
For above-mentioned deficiency, the utility model discloses one simple in structure, easy for installation, destructive little, picked up signal is abundant, the double optical fiber grating sensor that temperature self-compensation, Detection of Bolt Bonding Integrity highly sensitive, that can realize kinetic measurement detect.
The technical solution adopted in the utility model is as follows:
A kind of double optical fiber grating sensor detecting for Detection of Bolt Bonding Integrity, comprise a clip of clamping the annular shell of termination point of anchor rod, on clip inwall, be provided with an elastomer block I along anchor pole axial direction one end, the other end is provided with hollow elasticity piece II, in groove in described elastomer block I, place a sensing grating, in described elastomer block II, a coupling grating in free state is placed in vacancy, and the Fiber Bragg Grating FBG parameter of sensing grating, coupling grating is identical; Two gratings are positioned on same optical fiber and the distance of setting of being separated by, and described optical fiber one end passes clip, is connected with demodulation light path and display device; Excite after elastic wave at termination point of anchor rod, while acting on sensing grating along the elastic wave of the elastic wave of propagating in anchor bar body or process reflection, can cause the skew of sensing grating reflectance spectrum centre wavelength, through with the demodulation of light intensity and the processing of data of overlapping region of mate optical grating reflection and composing, obtain time domain or the frequency domain characteristic of elastic wave signal.
Described demodulation light path and display device comprise light source, coupling mechanism, photoelectric commutator and oscillograph, an output terminal of the exit butt coupling device of described optical fiber, an input end of coupling mechanism connects light source, another reflection input end connects photoelectric commutator, and described photoelectric commutator is connected with oscillograph.
Described sensing grating sticks in the groove of elastomer block I inside.
Described elastomer block I, elastomer block II is all firmly pasted on clip inwall.
Described coupling grating is freely placed under the protection of hollow elasticity piece II, is not stressed.
Described elastomer block I is for the elastic wave of perception anchor pole, and by elastic wave indirectly-acting on sensing grating.
Described two gratings are same parameter, and on an optical fiber, processing is scribed and formed, and space retains distance, is used for ensureing that two Fiber Bragg Grating FBGs are placed in two elastic bodys.
For the sensitiveer signal that detects, the grid length of two gratings is less than the accumulation signal applying propagates the half of wavelength in anchor pole;
Described match grating pairs sensing grating has temperature, disturbance compensation effect.
On same described optical fiber, two gratings are intensity demodulation principle, in the time there is skew in the centre wavelength of sensing grating, the reflectance spectrum of sensing grating changes with the area of the reflectance spectrum lap that mates grating, be that light intensity changes, finally convert electric signal to and just change, to show on oscillograph.
The utility model adopts said structure, excite after elastic wave at termination point of anchor rod, while acting on sensing grating along the elastic wave of the elastic wave of propagating in anchor bar body or process reflection, can cause the skew of sensing grating reflectance spectrum centre wavelength, through with the demodulation of light intensity of mate overlapping region that optical grating reflection composes, and the demonstration of late time data and processing, obtain time domain or the frequency domain characteristic of elastic wave signal, for the analysis of Detection of Bolt Bonding Integrity provides strong foundation.
The beneficial effects of the utility model are as follows:
Although the utility model also adopts fiber bragg grating device, but by experiencing the method for the stress reflexion ripple that exciting causes instead of being applied directly to the power on anchor pole, and before and after adopting, two FBG devices of the same parameter are realized, utilize the energy of two FBG reflectance spectrum overlapping regions indirectly to measure Detection of Bolt Bonding Integrity, belong to intensity demodulation.Adopt the most responsive axial direction of FBG in structure measuring, ensure to cause the stress deformation of elastic structure, and cause between the variation of FBG reflectance spectrum waveform drift and become essential linear relationship.And adopt two gratings that parameter is identical, can eliminate temperature impact and external disturbance.
Brief description of the drawings
Fig. 1 the utility model is at the structural drawing of the state of enforcement;
Fig. 2 the utility model Sensor section structural drawing;
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 coupling gratings.
Embodiment
Below in conjunction with accompanying drawing, the utility model is elaborated:
The double optical fiber grating sensor detecting for Detection of Bolt Bonding Integrity, comprise the clip 2 that can clamp the annular shell of anchor pole 3 terminations of being located in rock 1, on clip 2 inwalls, paste an elastomer block I5 along bolt shaft to a side, opposite side is pasted the elastomer block II7 of a hollow suitable with elastomer block I5 size, sensing grating 6 is positioned in the groove of elastomer block I5, coupling grating 8 is positioned over elastomer block II7 hollow space in free state, two Fiber Bragg Grating FBG parameters are identical, on an optical fiber, scribe processing at a distance of a segment distance by ultraviolet ray, this root optical fiber is drawn after clip by fiber-optic wire 4, connect demodulation light path and display device, this device comprises light source, coupling mechanism, photoelectric commutator and oscillograph, the output terminal of the exit butt coupling device of optical fiber, an input end of coupling mechanism connects light source, and another reflection input end connects photoelectric commutator, and described photoelectric commutator is connected with oscillograph.
Sensor receives the accumulation signal that puts on termination point of anchor rod with exciting hand hammer, and the sensing grating in the elastomer block that is laid in I5 groove seals with glue, and then elastomer block I5 perception elastic wave acts on sensing grating.Coupling grating is freely placed under the protection of elastomer block II7, avoids pressure.Two elastomer block are all firmly pasted on clip 2 inwalls.
Two Fiber Bragg Grating FBGs are same parameter, and on an optical fiber, processing is scribed and formed, and space retains certain distance, is used for ensureing that two Fiber Bragg Grating FBGs are placed in elastomer block I5, elastomer block II7.
For the sensitiveer signal that detects, the grid length of two gratings is less than the accumulation signal applying propagates the half of wavelength in anchor pole;
Coupling grating 8 also has certain compensating action such as temperature, disturbance.
On same optical fiber, two gratings are intensity demodulation.
The utility model adopts said structure, excite after elastic wave in anchor pole 3 terminations, while acting on sensing grating 6 along the elastic wave of the elastic wave of propagating in anchor pole 3 bodies or process reflection, can cause the skew of sensing grating 6 reflectance spectrum centre wavelengths, through with the demodulation of light intensity of overlapping region of mating grating 8 reflectance spectrums, and the processing of late time data, obtain time domain or the frequency domain characteristic of elastic wave signal, for the analysis of Detection of Bolt Bonding Integrity provides strong foundation.
Claims (7)
1. the double optical fiber grating sensor detecting for Detection of Bolt Bonding Integrity, it is characterized in that: comprise a clip of clamping the annular shell of termination point of anchor rod, on clip inwall, be provided with an elastomer block I along anchor pole axial direction one end, the other end is provided with hollow elasticity piece II, in groove in described elastomer block I, place a sensing grating, in described elastomer block II, a coupling grating in free state is placed in vacancy, and the Fiber Bragg Grating FBG parameter of sensing grating, coupling grating is identical; Two gratings are positioned on same optical fiber and the distance of setting of being separated by, and described optical fiber one end passes clip, is connected with demodulation light path and display device; Excite after elastic wave at termination point of anchor rod, while acting on sensing grating along the elastic wave of the elastic wave of propagating in anchor bar body or process reflection, can cause the skew of sensing grating reflectance spectrum centre wavelength, through with the demodulation of light intensity and the processing of data of overlapping region of mate optical grating reflection and composing, obtain time domain or the frequency domain characteristic of elastic wave signal.
2. the double optical fiber grating sensor detecting for Detection of Bolt Bonding Integrity as claimed in claim 1, it is characterized in that: described demodulation light path and data presentation device comprise light source, coupling mechanism, photoelectric commutator and an oscillograph, the output terminal of the exit butt coupling device of described optical fiber, an input end of coupling mechanism connects light source, another reflection input end connects photoelectric commutator, and described photoelectric commutator is connected with oscillograph.
3. the double optical fiber grating sensor detecting for Detection of Bolt Bonding Integrity as claimed in claim 1, is characterized in that: described sensing grating sticks in the groove of elastomer block I inside.
4. the double optical fiber grating sensor detecting for Detection of Bolt Bonding Integrity as claimed in claim 1, is characterized in that: described elastomer block I, elastomer block II is all firmly pasted on clip inwall.
5. the double optical fiber grating sensor detecting for Detection of Bolt Bonding Integrity as claimed in claim 1, is characterized in that: described coupling grating is freely placed under the protection of elastomer block II, is not stressed.
6. the double optical fiber grating sensor detecting for Detection of Bolt Bonding Integrity as claimed in claim 1, is characterized in that: described elastomer block I is for the elastic wave of perception anchor pole, and by elastic wave indirectly-acting on sensing grating.
7. the double optical fiber grating sensor detecting for Detection of Bolt Bonding Integrity as claimed in claim 1, is characterized in that: the grid length of described two gratings is less than the accumulation signal applying propagates the half of wavelength in anchor pole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420332978.3U CN204028044U (en) | 2014-06-20 | 2014-06-20 | A kind of double optical fiber grating sensor detecting for Detection of Bolt Bonding Integrity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420332978.3U CN204028044U (en) | 2014-06-20 | 2014-06-20 | A kind of double optical fiber grating sensor detecting for Detection of Bolt Bonding Integrity |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204028044U true CN204028044U (en) | 2014-12-17 |
Family
ID=52067886
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420332978.3U Expired - Fee Related CN204028044U (en) | 2014-06-20 | 2014-06-20 | A kind of double optical fiber grating sensor detecting for Detection of Bolt Bonding Integrity |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204028044U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106906824A (en) * | 2015-12-22 | 2017-06-30 | 中国水利水电科学研究院 | Distribution type fiber-optic prestressing force intellectual monitoring anchor cable |
| CN114740525A (en) * | 2022-04-08 | 2022-07-12 | 西北大学 | Suspended core ultrasonic sensor based on double ultrashort fiber gratings and manufacturing method thereof |
-
2014
- 2014-06-20 CN CN201420332978.3U patent/CN204028044U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106906824A (en) * | 2015-12-22 | 2017-06-30 | 中国水利水电科学研究院 | Distribution type fiber-optic prestressing force intellectual monitoring anchor cable |
| CN106906824B (en) * | 2015-12-22 | 2020-10-09 | 中国水利水电科学研究院 | Distributed optical fiber prestress intelligent monitoring anchor cable |
| CN114740525A (en) * | 2022-04-08 | 2022-07-12 | 西北大学 | Suspended core ultrasonic sensor based on double ultrashort fiber gratings and manufacturing method thereof |
| CN114740525B (en) * | 2022-04-08 | 2023-09-29 | 西北大学 | Suspended core ultrasonic sensor based on double-ultrasonic-short fiber gratings and manufacturing method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104062363B (en) | A kind of double optical fiber grating sensor for Detection of Bolt Bonding Integrity detection | |
| CN101413836B (en) | Optical fiber grating soil pressure sensor | |
| CN102798492A (en) | Fiber bragg grating detection system device and method for detecting anchoring force of anchor rod | |
| CN202139617U (en) | System for monitoring power transmission line pole tower foundation settlement based on single-point displacement | |
| CN101280690A (en) | Pressure sensor | |
| CN107121158B (en) | A kind of internal enclosed cantilever beam fiber-optic grating sensor | |
| CN203432538U (en) | Fiber grating crack sensor | |
| CN102645245B (en) | Distributed fluid pressure and temperature simultaneous measurementmethod based on optical fiber brillouin scattering | |
| CN102809454A (en) | FBG (Fiber Bragg Grating) force measuring anchor rod and using method | |
| CN103307995B (en) | Two-way long gauge length optical fibre grating strain transducer | |
| CN103277387A (en) | Intelligent bolt for optical fiber grating sensor | |
| CN202483561U (en) | Coal-bed gas well liquid level monitoring system based on optical fiber sensing | |
| CN105387968A (en) | Optical fiber cladding surface Bragg grating temperature self-compensating pressure sensor | |
| CN204028044U (en) | A kind of double optical fiber grating sensor detecting for Detection of Bolt Bonding Integrity | |
| CN206862534U (en) | The quiet torque sensor of Non-contact Magnetic detection fiber grating | |
| CN102175364B (en) | Vertical stress fiber grating pressure sensor for analog simulation experiment | |
| CN201561828U (en) | Fiber grating geological disaster monitor | |
| CN201043923Y (en) | Optical fiber optical grating pressure transducer for rock dust | |
| CN204313795U (en) | Flush type multi-point displacement measurement mechanism | |
| CN108061522A (en) | Distribution type fiber-optic Bragg grating MISSILE LAUNCHING case strain monitoring system | |
| CN102562034A (en) | System for monitoring liquid level of coal-bed gas well based on optical fiber sensing | |
| CN201945414U (en) | Vertical stress fiber grating pressure sensor for analog simulation tests | |
| CN208688694U (en) | A kind of fiber grating force sensor for anchor rope | |
| Jie et al. | A new packaged FBG sensor for underground cable temperature monitoring | |
| CN202041182U (en) | Mixed range fibre Bragg grating (FBG) stress and crack sensor packaged by concrete material |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141217 Termination date: 20150620 |
|
| EXPY | Termination of patent right or utility model |