CN202471317U - Optical fiber grating dynamometric device - Google Patents
Optical fiber grating dynamometric device Download PDFInfo
- Publication number
- CN202471317U CN202471317U CN 201220021388 CN201220021388U CN202471317U CN 202471317 U CN202471317 U CN 202471317U CN 201220021388 CN201220021388 CN 201220021388 CN 201220021388 U CN201220021388 U CN 201220021388U CN 202471317 U CN202471317 U CN 202471317U
- Authority
- CN
- China
- Prior art keywords
- cavity
- strain
- optical fiber
- grating
- shell
- 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
Images
Abstract
The utility model provides an optical fiber grating dynamometric device which comprises a cavity, a shell, a spring tube, a strain beam and an optical fiber, wherein the spring tube, the strain beam and the optical fiber are installed inside the shell. To-be-measured objects are connected with the cavity which is variable in volume under acting force of the to-be-measured objects. A cavity opening is installed on the cavity and enables liquid inside the cavity to flow in and out. The cavity opening is connected with an opening end of the spring tube. A closed end of the spring tube is connected with one end of the strain beam, and the other end of the strain beam is fixed on the shell. A strain grating is positioned on the strain beam and used for inducting deformation of the strain beam. The strain grating is connected with an optical fiber grating signal analyzer through optical fiber. The optical fiber grating dynamometric device is good in lightning-proof capability, strong in anti-electromagnetic interference, small in electromagnetic influence on measured data, stable and reliable, and capable of meeting requirements of remote measurement by increasing the length of the optical fiber.
Description
[technical field]
The utility model relates to a kind of device for measuring force, particularly a kind of fiber grating device for measuring force.
[background technology]
In the safety monitoring of Geotechnical Engineering side slope, underground chamber and other civil engineering structure; Normal anchor pole or the anchor dynamometer of adopting monitored the loading of anchor pole or anchor cable and the STRESS VARIATION situation under time effect thereof; Because the measurement environment situation is complicated, so the measurement stability of anchor pole or anchor dynamometer is the problem that engineering circle comparatively is concerned about always.
The resistance strain type sensor that existing anchor pole or anchor cable pressure-measuring instrument adopt is measured; Because there is anti-thunderbolt poor performance in resistance strain type sensor self; The shortcoming that anti-electromagnetic interference performance is low; Cause the measurement result stability of existing anchor pole or anchor cable pressure-measuring instrument not high, poor reliability.
[utility model content]
The utility model patent is not high to anchor pole in the prior art or anchor cable device for measuring force measurement result stability, and the shortcoming of poor reliability proposes a kind of fiber grating device for measuring force; This anti-thunderbolt of device performance is good; Anti-electromagnetic interference performance is strong, and measurement result is reliable and stable, and can realize telemeasurement.
For solving the prior art problem, the utility model provides following technical scheme.
A kind of fiber grating device for measuring force is characterized in that: it comprises cavity, shell and places bourdon tube, strain beam and the optical fiber in the shell; Determinand be connected at the variable cavity of determinand acting force lower volume; Said cavity is provided with the cavity hatch that supplies liquid turnover in the cavity; Said cavity hatch links to each other with the openend of said bourdon tube; The blind end of said bourdon tube is connected with an end of said strain beam; The other end of said strain beam is fixed in said shell; Said strain beam is provided with the strain grating that is used to respond to strain beam deformation, and said strain grating is connected with the fiber grating signal analyzer through optical fiber.
Wherein, be provided with the temperature compensation beam in the said shell, said temperature compensation beam is provided with the temperature compensation grating of connecting with the strain grating.
Wherein, said cavity is complemented each other to form by overcoat and the piston that places overcoat and the flexible connection of said overcoat; Said cavity hatch is arranged at overcoat; Said determinand is connected with piston through the determinand mounting hole on the piston;
Wherein, the spring base that is used for fixing bourdon tube also is installed in the said shell; Said spring base is provided with spring base path, and said spring base path one end is connected with said cavity hatch, and the other end is connected with the openend of said bourdon tube.
Wherein, said cavity hatch is connected through pipe with said bourdon tube openend.
The fiber grating device for measuring force beneficial effect compared with prior art that the utility model provides is: owing to adopt the sensor of grating fibers as pressure signal; The frequency ratio light wave of general electromagnetic radiation is much lower, so the light signal that in optical fiber, transmits does not receive the influence of electromagnetic interference (EMI), therefore; The anti-thunderbolt of the utility model performance is good; Anti-electromagnetic interference (EMI) is strong, and the data that measure receive electromagnetic effect little, and are reliable and stable; Because the loss of signal of Optical Fiber Transmission own is little, therefore can be through increasing the needs that length of fiber satisfies telemeasurement.
[description of drawings]
Fig. 1 is the structural representation of the utility model embodiment.
Fig. 2 is the A-A diagrammatic cross-section of cavity shown in Figure 1.
Among Fig. 1 to Fig. 2,1 anchor pole, 2 cavitys, 21 overcoats, 22 pistons, 3 shells, 42 optical fiber, 421 strain gratings, 422 temperature compensation gratings, 43 spring bases, 44 strain beams, 45 bourdon tubes, 46 temperature compensation beams, 47 pipes.
[embodiment]
Below in conjunction with accompanying drawing the technical scheme of the utility model is carried out detailed elaboration.
Fiber grating device for measuring force as shown in Figure 1, it comprises cavity 2, shell 3 and places bourdon tube 45, strain beam 44 and the optical fiber 42 in the shell 3.
Can find out that by Fig. 2 cavity 2 is around in by overcoat 21 that piston 22 is outside to be formed, be fixed on the rock stratum, be loaded with liquid in the cavity 2 through nut etc.; Determinand anchor pole 1 passes cavity 2, one ends insertion inside, rock stratum and experiences the rock stratum interior change, and an end is installed on the anchor pole mounting hole on the piston 22; Overcoat 21 is provided with cavity hatch; Be installed in and drive piston 22 when anchor pole 1 on the piston 22 receives the power that the rock stratum interior change produces and move together; This moment, piston 22 belonged to lateral movements to cavity 2, the volume-diminished of cavity 22, and the liquid in the cavity 2 get into pipe 47 through this cavity hatch; Liquid does not specifically limit in the cavity, preferably has oil-based liquid lubricated, anticorrosion, antirust function.
Cavity 2 also can be the oil pocket of hydraulic jack, and an oil pocket opening is set on the oil pocket of hydraulic jack, and anchor pole 1 is connected with the piston rod of hydraulic jack, and anchor pole 1 drives piston rod movement, and oil chamber volume changes, and liquid can get into pipe 47 through the oil pocket opening; Cavity 2 can also be selected for use when receiving the external force extruding can produce the rubber blister cavities of deformation; Anchor pole 1 is inconsistent with the blister cavities outer wall, during work, with the blister cavities stationkeeping; Anchor pole 1 connects with the blister cavities outer wall; The extruding blister cavities makes blister cavities generation deformation when anchor pole 1 receives external force to produce displacement, and the liquid in the blister cavities is clamp-oned pipe 47 from cavity hatch.
Bourdon tube 45 is the hollow tube made from resilient material, can be C shape as shown in Figure 1, can also be shapes such as spirality or disc spring shape; Concrete shape does not limit; When liquid got into bourdon tube 45, bourdon tube 45 deformed under fluid pressure action, and blind end produces displacement; This moment, the blind end of bourdon tube 45 produced pulling force to strain beam 44, made strain beam 44 that deformation take place under the effect of this pulling force; The strain grating 421 of optical fiber 42 sticks between the stiff end and link of strain beam 44, is used to experience the deformation of strain beam 44, and the signal that optical fiber 42 is experienced strain grating 421 is transferred to the fiber grating signal analyzer.
Fiber grating device for measuring force as shown in Figure 1, during work, anchor pole 1 receives the external force effect and is subjected to displacement, and drives piston 22 motions, makes that the hydraulic oil in the cavity 2 is got into bourdon tube 45 through oil pipe 47, spring base 43 under the effect of this extruding force; Bourdon tube 45 deformation takes place under the effect of hydraulic oil, the blind end of bourdon tube 45 produces displacement, the blind end of bourdon tube 45 applies acting force through bolt and steel wire to strain beam 44, makes strain beam 44 deformation that bends; The crooked deformation of strain beam 44 is secured at strain grating 421 perception on it, and through optical fiber 42 perceptual signal is sent to the fiber grating signal analyzer; The fiber grating analyser through analyzing, converts the grating wavelength variable signal that receives the suffered external force of anchor pole 1 to, thereby realizes anchor pole 1 is received force measurement.
In practical application; Because fiber grating inevitably can receive the influence of environment temperature at work; And the change of environment temperature will directly cause measured value that the drift variation takes place; For addressing this problem, the utility model has been done further improvement: also be provided with the temperature compensation grating 422 of connecting with strain grating 421 on the optical fiber 42, temperature compensation grating 422 sticks on the temperature compensation beam 46 that is arranged in the shell 3.During work, temperature compensation beam 46 does not stress, and therefore paste 422 influences that receive environment temperature of temperature compensation grating above that, and strain grating 421 has both received the influence of strain beam effects of strain power, received the influence of environment temperature again.When the ambient temperature effect that receives with strain grating 421 of temperature compensation grating 422 is identical; The measured value of strain grating 421 is deducted the measured value of temperature compensation grating 422; Can remove the influence of temperature, realize temperature self-compensation, make measurement numerical value more reliable measured value.
Owing to adopt the sensor of grating fibers as pressure signal; The frequency ratio light wave of general electromagnetic radiation is much lower, so the light signal that in optical fiber, transmits does not receive the influence of electromagnetic interference (EMI), therefore; The anti-thunderbolt of the utility model performance is good; Anti-electromagnetic interference (EMI) is strong, and the data that measure receive electromagnetic effect little, and are reliable and stable; Because the loss of signal of Optical Fiber Transmission own is little, therefore can be through increasing the needs that length of fiber satisfies telemeasurement.In addition; This use is novel with the flexible member of bourdon tube 45 as the power of transmission; Can realize the conversion of different ranges through changing different bourdon tube 45, be convenient to enlarge the sensing range of device for measuring force, with the range of on purpose selecting to adapt with measured value range; Can reduce systematic error, make the result who arrives of measurement more accurate.
Fiber grating device for measuring force in the utility model except that can be used for measuring anchor pole 1 stressed, it is stressed also to can be used for measuring anchor cable, concrete operations are with anchor pole 1.
Above content is the further explain that combines concrete preferred implementation that the utility model is done, and can not assert that the practical implementation of the utility model is only limited to these explanations.For the those of ordinary skill of technical field under the utility model, under the prerequisite that does not break away from the utility model design, can also make some simple deduction or replace, all should be regarded as belonging to the protection domain of the utility model.
Claims (6)
1. fiber grating device for measuring force is characterized in that: it comprises cavity, shell and places bourdon tube, strain beam and the optical fiber in the shell;
Determinand be connected at the variable cavity of determinand acting force lower volume; Said cavity is provided with the cavity hatch that supplies liquid turnover in the cavity; Said cavity hatch links to each other with the openend of said bourdon tube; The blind end of said bourdon tube is connected with an end of said strain beam; The other end of said strain beam is fixed in said shell;
Said strain beam is provided with the strain grating that is used to respond to said strain beam deformation, and said strain grating is connected with the fiber grating signal analyzer through optical fiber.
2. fiber grating device for measuring force as claimed in claim 1 is characterized in that: be provided with the temperature compensation beam in the said shell, said temperature compensation beam is provided with the temperature compensation grating of connecting with said strain grating.
3. according to claim 1 or claim 2 fiber grating device for measuring force, it is characterized in that: said cavity is complemented each other to form by overcoat and the piston that places overcoat and said overcoat to flexibly connect; Said cavity hatch is arranged at said overcoat; Said determinand is connected with said piston through the determinand mounting hole on the said piston..
4. according to claim 1 or claim 2 fiber grating device for measuring force is characterized in that: the spring base that is used for fixing bourdon tube also is installed in the said shell; Said spring base is provided with spring base path, and said spring base path one end is connected with said cavity hatch, and the other end is connected with the openend of said bourdon tube.
5. fiber grating device for measuring force as claimed in claim 1 is characterized in that: said cavity hatch is connected through pipe with said bourdon tube openend.
6. fiber grating device for measuring force as claimed in claim 1 is characterized in that: said determinand is anchor pole or anchor cable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220021388 CN202471317U (en) | 2012-01-17 | 2012-01-17 | Optical fiber grating dynamometric device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220021388 CN202471317U (en) | 2012-01-17 | 2012-01-17 | Optical fiber grating dynamometric device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202471317U true CN202471317U (en) | 2012-10-03 |
Family
ID=46919469
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220021388 Expired - Fee Related CN202471317U (en) | 2012-01-17 | 2012-01-17 | Optical fiber grating dynamometric device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202471317U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN104048793A (en) * | 2013-03-12 | 2014-09-17 | 上海启鹏工程材料科技有限公司 | Fiber grating hydraulic sensor |
-
2012
- 2012-01-17 CN CN 201220021388 patent/CN202471317U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN104048793A (en) * | 2013-03-12 | 2014-09-17 | 上海启鹏工程材料科技有限公司 | Fiber grating hydraulic sensor |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102589767B (en) | Rock core internal stress field test instrument and use method thereof | |
| CN102121860A (en) | Corrugated diaphragm type pipe external pressure sensor, oil-water well casing external pressure monitoring device and method | |
| CN101280690A (en) | Pressure sensor | |
| CN209166366U (en) | A kind of novel top panel separation indicator based on fiber grating sensing technology | |
| CN112268642A (en) | Underground stress measuring device and method based on distributed optical fiber sensing | |
| CN206038093U (en) | Liquid level measurement device of wide range high accuracy | |
| CN110082023A (en) | A kind of real-time monitoring for cable force device and monitoring method | |
| CN111456716A (en) | Underground strain distribution monitoring system and method based on distributed optical fiber sensing | |
| CN105910580A (en) | Distributed fiber Bragg grating inclinometer device and inclination metering method | |
| Hong et al. | Deformation monitoring of long GFRP bar soil nails using distributed optical fiber sensing technology | |
| CN107356356A (en) | The fiber grating surrouding rock stress monitoring device and monitoring system of a kind of high-survival rate | |
| CN103575332B (en) | Multi-dimensional and multidirectional stress-strain monitoring system | |
| CN202471317U (en) | Optical fiber grating dynamometric device | |
| CN104501732B (en) | A kind of hydro-structure distortion distributed optical fiber sensing device and method | |
| CN110763380B (en) | One-hole multi-point stress and displacement monitoring system based on fiber bragg grating measurement | |
| CN113188692B (en) | Soil and water pressure monitoring early warning device | |
| CN218156633U (en) | Mining intrinsic safety pressure instrument | |
| CN103207036A (en) | Fiber grating force-measuring device | |
| CN212454396U (en) | Underground strain distribution monitoring system based on distributed optical fiber sensing | |
| CN203069150U (en) | Novel fiber bragg grating strain meter | |
| CN202256819U (en) | Sensing cable for simultaneously distributed monitoring of temperature and pressure in oil-well oil tube | |
| CN108106543B (en) | Side slope monitoring multipoint displacement sensor based on optical fiber bending loss | |
| CN103822609A (en) | Double-sleeve type fiber Bragg grating settlement meter | |
| CN204286374U (en) | A kind of hydro-structure distortion distributed optical fiber sensing device | |
| CN214095927U (en) | Fiber grating displacement sensor of gear mechanical linkage |
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: 20121003 Termination date: 20170117 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |