CN101059382A - Optical fiber grating anchor ergometer - Google Patents
Optical fiber grating anchor ergometer Download PDFInfo
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- CN101059382A CN101059382A CN 200710014418 CN200710014418A CN101059382A CN 101059382 A CN101059382 A CN 101059382A CN 200710014418 CN200710014418 CN 200710014418 CN 200710014418 A CN200710014418 A CN 200710014418A CN 101059382 A CN101059382 A CN 101059382A
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- optical fiber
- fiber grating
- inner sleeve
- diameter
- sleeve
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Abstract
The invention relates to an optical fiber grating anchor rod force meter, comprising an outer sleeve and an inner sleeve, wherein the outer sleeve is arranged outside the inner sleeve, with one open end and a round hole at another end, two ends of the inner sleeve are respectively arranged with protruded edges, while the protruded edge at one end is larger than the outer diameter of the outer diameter, and the protruded edge at another end is some smaller than the inner diameter of the outer sleeve, the outer sleeve is arranged with an optical fiber lead out channel, the cylinder face of the inner sleeve is vertically adhered with an optical fiber grating for sensing the stress strain, and the optical fiber grating through the optical fiber lead out channel on the outer sleeve is connected with an optical demodulation signal processor. When in use, one end of the anchor rod is through the inner sleeve to be inserted into rock, while another end is fixed on the end of the inner sleeve, the outer sleeve is fixed outside the inner sleeve, the anchor rod senses the axial drawing force of around rock, via the optical fiber grating to be transmitted to the optical signal demodulation processor, to analyze and calculate out the wavelength shift value, to obtain the volume of drawing force on the inner sleeve. The invention has simple structure, easy operation, high sensitivity, stability, and reliability, without affected by condition.
Description
Technical field
The present invention relates to a kind of device of measuring the anchor pole axial tensile force, the place that specifically a kind of tunnel that is applied to mine, ground and construction of underground structure, tunnel use anchor pole, and the dynamometer of other industry using optical fibre grating anchor pole.
Background technology
We know, foil gauge is adopted in the measurement of present anchor pole axial tensile force, but foil gauge has following shortcoming: 1.-is subject to electromagnetic interference (EMI) and external environmental interference, and 2. insensitive, unreliable, life-span weak point 3. is afraid of moist, 4. be difficult for forming the induction network, volume of transmitted data is little, and a plurality of foil gauge sensings are measured simultaneously, is difficult to series connection, the signal extension line is many, connects complicated.
Summary of the invention
The present invention is for overcoming above-mentioned the deficiencies in the prior art, provide a kind of simple in structure, measure convenient, accurately, the volume of transmitted data high optical fiber grating anchor ergometer of cost performance greatly, easily forming optical fiber sensing network, be not affected by the external environment.
The objective of the invention is to adopt following technical proposals to realize: a kind of optical fiber grating anchor ergometer, comprise overcoat and interior cover, outside overlapping in being set in outward, overcoat one end opening, the other end has circular hole; The axial cross section of interior cover is I-shaped, and its two ends are respectively equipped with the convex edge, and an end convex edge diameter is greater than the external diameter of overcoat, and other end convex edge diameter is less than the internal diameter of overcoat; Put outward and be provided with the optical fiber extraction channel, in put outside surface and be installed with fiber grating, fiber grating connects and passes the outer optical fiber that puts, and is connected with light signal demodulation process device through extraction channel.
It is stepped that the convex edge at described interior cover two ends is two-stage, and the bigger end circumference of diameter is provided with screw hole, puts outward to be provided with and the corresponding through hole of the screw hole of interior cover.
In vertically being pasted on, overlaps on the face of cylinder described fiber grating.
Grating anchor rod probe of the present invention is an optical sensor, essential safety, superior performance, anti-electromagnetic interference (EMI) are strong etc., put vertical direction fixed installation fiber grating in popping one's head in, cover endoporus in anchor pole passes is with the stress strain gauge of interior cover formation one measurement anchor pole axial force size.During use, cover inserted in the rock mass in anchor pole one end passed, and the other end overlaps on the end face in being tightened in by nut.Cover outside in again overcoat being placed in, cover was fixed by screw means than the ladder place of larger diameter end in overcoat one end was stuck in; The ladder place of cover smaller diameter end in the other end is stuck in, not only attractive in appearance but also can protect fiber-optic grating sensor to avoid outside construction destruction and other influence preferably.Inserting anchor pole in the ground experiences country rock and is applied to axial tensile force on the anchor pole, the tension and compression deformation of cover in transmission causes, and then the fiber grating that puts in the variation of power is delivered to, fiber grating connects Transmission Fibers and by extraction channel light signal is delivered on the light signal demodulation process device, the stretching of analyzing fiber-optic grating sensor changes the directly size of ergometry, light signal demodulating equipment coupling input broadband light is in optical fiber, enter into the light signal demodulating equipment again through the light after the reflection of fiber grating, the stretching of fiber grating causes that the spacing of grating changes, thereby the drift that causes catoptrical centre wavelength changes, demodulating equipment is responsible for the drift value of analytical calculation wavelength, thereby obtain the stretcher strain amount of fiber grating, thereby overlap the size that is subjected to tensile force in drawing.Optical fiber grating sensing probe is an optical sensor, and essential safety is highly sensitive, and stability is good with unfailing performance, be not afraid of humidity and dust, is not subjected to advantages such as various environmental impacts such as external electromagnetic field, vibration.That the present invention has is simple in structure, manufacture craft is simple, cost performance is high, characteristics such as easy to operate, accurate.
The light signal demodulation process device of mentioning among the present invention is existing equipment, does not repeat them here.
Description of drawings
Fig. 1 is a structural representation of the present invention;
Fig. 2 is a user mode synoptic diagram of the present invention;
Fig. 3 is on-load pressure one wavelength curve figure of the present invention.
1. overcoats wherein, 2. in cover, 3. optical fiber extraction channel, 4. fiber grating, 5. optical fiber, 6. convex edge, 7. nut, 8 anchor poles, 9. rock mass.
Embodiment
The present invention is further described below in conjunction with drawings and Examples.
As shown in Figure 1 and Figure 2, in being located at, overlaps outside 2 in overcoat 1, overcoat 1 one end openings, and the other end has circular hole; Interior cover 2 axial cross sections are I-shaped, and interior cover 2 two ends are respectively equipped with and are the stair-stepping convex edge 6 of two-stage, and the bigger end circumference of diameter is provided with screw hole, and overcoat 1 is provided with and the corresponding through hole of the screw hole of interior cover 2.The bigger end convex edge of diameter 6 diameters are greater than the external diameter of overcoat 1, and other end convex edge 6 diameters are less than the internal diameter of overcoat 1; Overcoat 1 is provided with optical fiber extraction channel 3, and perpendicular to being pasted with fiber grating 4 on the direction of the interior cover face of cylinder, fiber grating 4 is connected with optical fiber 5, and the optical fiber extraction channel 3 that optical fiber 5 passes on the overcoat 1 is connected with light signal conciliation treating apparatus.
During use, anchor pole 8 one ends insert in the rock mass 9 from holding passing than minor diameter of interior cover 2, and the other end is tightened on interior cover 2 end faces by nut 7, cover 2 generation precompression distortion in anchor pole 8 generation prestress are caused.Cover 2 outsides in again overcoat 1 being placed in, the cover 2 ladder places than larger diameter end were fixed by screw means in overcoat 1 one ends were stuck in; The ladder place of cover 2 smaller diameter end in the other end is stuck in, not only attractive in appearance but also can protect fiber-optic grating sensor to avoid outside construction destruction and other influence preferably.Distortion was upheld in the compression of cover 2 in then the axial tension that is subjected on the anchor pole 8 caused, the mechanics parameter of anchor pole 8 surrounding rock bodies 9 comes indirect reaction by the axial tensile force of anchor pole 8, on the fiber grating 4 in being delivered to again on the cover 2, fiber grating 4 connects optical fiber and by extraction channel 3 signal is delivered on the light signal demodulation process device, and light signal demodulation process device analysis goes out relevant parameter.
The present invention is positioned over the tension and compression universal testing machine, through experiment test.As shown in Figure 3, horizontal ordinate is a pressure, unit K N, ordinate is that Fiber Bragg Grating FBG is along with the pressure that detects changes (variation of anchor pole axial tensile force in ground just), and the variation of centre wavelength, can find out that from curve the variation of experiencing pressure is very sensitive, carry and unloading curve symmetry substantially, cause the variation of the stress that grating is surveyed very delicately.This transducer sensitivity height, range ability is big, and anti-electromagnetic interference (EMI) is durable, the reliability height.
Claims (3)
1. an optical fiber grating anchor ergometer comprises overcoat and interior cover, it is characterized in that: outside overlapping in being set in outward, and overcoat one end opening, the other end has circular hole; The axial cross section of interior cover is I-shaped, and its two ends are respectively equipped with the convex edge, and an end convex edge diameter is greater than the external diameter of overcoat, and other end convex edge diameter is less than the internal diameter of overcoat; Put outward and be provided with the optical fiber extraction channel, be pasted with fiber grating on the lining the outer surface of, fiber grating connects optical fiber, and optical fiber passes the outer optical fiber extraction channel that puts and is connected with light signal demodulation process device.
2. optical fiber grating anchor ergometer according to claim 1 is characterized in that: it is stepped that the convex edge at described interior cover two ends is two-stage, and the bigger end circumference of diameter is provided with screw hole, puts outward to be provided with and the corresponding through hole of the screw hole of interior cover.
3. optical fiber grating anchor ergometer according to claim 1 is characterized in that: overlap on the face of cylinder in described fiber grating vertically is pasted on.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200710014418 CN101059382A (en) | 2007-04-29 | 2007-04-29 | Optical fiber grating anchor ergometer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200710014418 CN101059382A (en) | 2007-04-29 | 2007-04-29 | Optical fiber grating anchor ergometer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101059382A true CN101059382A (en) | 2007-10-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200710014418 Pending CN101059382A (en) | 2007-04-29 | 2007-04-29 | Optical fiber grating anchor ergometer |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101576422B (en) * | 2009-06-18 | 2010-10-13 | 山东省科学院激光研究所 | Optical fiber grating anchor stress sensor |
| CN102809454A (en) * | 2012-06-29 | 2012-12-05 | 山东大学 | FBG (Fiber Bragg Grating) force measuring anchor rod and using method |
| CN103207036A (en) * | 2012-01-17 | 2013-07-17 | 上海启鹏工程材料科技有限公司 | Fiber grating force-measuring device |
| CN105241598A (en) * | 2015-11-04 | 2016-01-13 | 中国航空动力机械研究所 | Method and system for measuring pre-tightening force of engine rotor |
| CN106556482A (en) * | 2016-11-16 | 2017-04-05 | 中南大学 | One kind is hung up face and can uphold anchor stress automonitor and its using method |
| CN110082023A (en) * | 2019-05-09 | 2019-08-02 | 湖北工业大学 | A kind of real-time monitoring for cable force device and monitoring method |
-
2007
- 2007-04-29 CN CN 200710014418 patent/CN101059382A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101576422B (en) * | 2009-06-18 | 2010-10-13 | 山东省科学院激光研究所 | Optical fiber grating anchor stress sensor |
| CN103207036A (en) * | 2012-01-17 | 2013-07-17 | 上海启鹏工程材料科技有限公司 | Fiber grating force-measuring device |
| CN102809454A (en) * | 2012-06-29 | 2012-12-05 | 山东大学 | FBG (Fiber Bragg Grating) force measuring anchor rod and using method |
| CN105241598A (en) * | 2015-11-04 | 2016-01-13 | 中国航空动力机械研究所 | Method and system for measuring pre-tightening force of engine rotor |
| CN105241598B (en) * | 2015-11-04 | 2017-08-15 | 中国航空动力机械研究所 | Engine rotor pretension force measuring method and system |
| CN106556482A (en) * | 2016-11-16 | 2017-04-05 | 中南大学 | One kind is hung up face and can uphold anchor stress automonitor and its using method |
| CN110082023A (en) * | 2019-05-09 | 2019-08-02 | 湖北工业大学 | A kind of real-time monitoring for cable force device and monitoring method |
| CN110082023B (en) * | 2019-05-09 | 2021-03-16 | 湖北工业大学 | Cable force real-time monitoring device and monitoring method |
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