CN102478388A - Optical fiber-type pull wire displacement sensing device - Google Patents
Optical fiber-type pull wire displacement sensing device Download PDFInfo
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- CN102478388A CN102478388A CN2010105584345A CN201010558434A CN102478388A CN 102478388 A CN102478388 A CN 102478388A CN 2010105584345 A CN2010105584345 A CN 2010105584345A CN 201010558434 A CN201010558434 A CN 201010558434A CN 102478388 A CN102478388 A CN 102478388A
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Abstract
The invention discloses an optical fiber-type pull wire displacement sensing device. The device comprises a housing inside which a winding wheel, a pull wire, a volute spring, a sliding bar, a first base plate, a second base plate and a driving unit, which are arranged, wherein the input end of the driving unit is arranged on the winding wheel. The first base plate is arranged at the output end of the driving unit. The volute spring is arranged on the driving unit and used for resetting the driving unit, and an optical fiber bending sensing unit is arranged between the first base plate and the second base plate. The optical fiber bending sensing unit comprises signal optical fibers, a curvilinear test channel and a test unit. The test unit is connected with a processing unit. The curvilinear test channel comprises a curvilinear support, and a plurality of A-side deformation teeth and a plurality of B-side deformation teeth, which are continuously distributed on two opposite sides on the curvilinear support. The A-side deformation teeth and the B-side deformation teeth are distributed in a stagger manner, and a curvilinear passage where the signal optical fibers pass is formed between the heads of the A-side deformation teeth and the heads of the B-side deformation teeth. The sensor array can be constructed according to needs, and the optical fiber-type pull wire displacement sensing device meets the requirements for large-range and large-deformation monitoring.
Description
Technical field
The invention belongs to technical field of optical fiber sensing, particularly a kind of optical-fiber type backguy displacement sensing apparatus.
Background technology
The stay-supported displacement transducer is widely used in machining measurement and other productive lifes after last century, the fifties emerged, and its basic structure comprises shell, backguy, reel, spiral spring and potentiometer; Reel is fixedly connected with potentiometer is coaxial, and wire hole is arranged on the shell, during the displacement of test object under test; Backguy is stretched out from the backguy hole; Its principle is with in the backguy elongation process, drives the rotation of reel, through potentiometer the rotation of reel is converted into the electric signal that can measure, transmit then; In the distance that electric signal is scaled the backguy elongation, reach the purpose of test object under test displacement.Because its principle of work is simple, cost is low, accommodative ability of environment is strong and precision is high, so range of application is wider.
But because reel is coaxial with potentiometer, more for a long time, potentiometer abrasion is serious at the potentiometer rotating cycle, and its precision and serviceable life are had a greatly reduced quality; Traditional in addition stay-supported displacement transducer is to be that signal is transmitted on the basis with the electric charge; Then many have under electromagnetic interference (EMI) and the strong-electromagnetic field environment disturb in using many; And problem is a lot of when needs make up sensor array and distant signal transmission; The complexity and the cost of system sharply rise, thereby have limited its use.As the landslide is being carried out in the early warning and monitoring; Need follow the tracks of the extend sizes and the speed in a plurality of cracks of massif surface distributed constantly; Adopting the stay-supported sensor is a kind of selection preferably; But existing is that the backguy sensor on basis makes up distributed or quasi-distributed sensor array difficulty on the one hand with the electric charge, responsive to electromagnetic interference (EMI) on the other hand, and in the actual life when big rainfall occurring also landslide crucial moment of danger just; And generally all can follow Thunderstorm Weather this moment, thereby make traditional backguy sensor can't be competent at this work.
In the patent of one Chinese patent application number 200810201667.2 " a kind of stay-supported optical fiber grating displacement sensors " a kind of scheme has been proposed: be to be that the potentiometer that sensing unit has substituted the conventional pull wires sensor comes the elongation of backguy is measured with the fiber grating; And through optical fiber with the transmission of this signal; This kind fiber grating backguy formula displacement transducer has plurality of advantages; Like anti-electromagnetic interference (EMI), volume is little, precision is high, be easy to make up quasi-distributed sensor array; And the purpose that can the long-distance transmissions of light signal be reached remote monitoring, the monitoring personnel have been broken away from such as such hazardous location, landslide.But it is that the monitoring instrument cost is higher that the sensor of fiber grating type all has a common shortcoming; Its light source not only need be a wideband light source; Also require to have higher power, particularly networking array type sensor-based system to need the wideer output spectrum and the light source of Geng Gao Output optical power, in addition the detection of echo optical signal is needed the equipment of degree of precision; This also makes the complicated cost of monitoring equipment high, and these have all limited promoting the use of of such fiber grating pull line sensor.
Summary of the invention
The objective of the invention is to overcome above-mentioned deficiency of the prior art, a kind of optical-fiber type backguy displacement sensing apparatus is provided.The present invention can make up sensor array as required, the requirement of satisfy on a large scale, large deformation being monitored, and it is simple in structure, reasonable in design, processing and fabricating convenient and use-pattern is flexible, highly sensitive, result of use is good, cost is low.
For realizing above-mentioned purpose; The technical scheme that the present invention adopts is: optical-fiber type backguy displacement sensing apparatus; It is characterized in that: comprise housing; Be provided with reel, backguy, spiral spring, slide bar, substrate one, substrate two and gear unit in the said housing; Said backguy is wrapped on the reel and the end end of backguy is fixed on the reel, and the initiating terminal of said backguy stretches out from said housing through the backguy mouth, and the initiating terminal of said backguy is provided with pull wire head; The input end of said gear unit is installed on the reel; Said substrate one is installed in the output terminal of gear unit, and said substrate one can be subjected to displacement by relative gear unit under the drive of gear unit, and said spiral spring is installed in and is used for resetting to gear unit on the gear unit; One end of said slide bar is movably arranged on the upper end of substrate one; The other end of said slide bar is fixed on the housing through substrate two, between substrate one and substrate two, is laid with the fibre-optical bending sensing unit, and said fibre-optical bending sensing unit comprises signal optical fibre, supply shaped form TCH test channel that signal optical fibre passes and join with signal optical fibre and the optical signal power variable quantity in the signal optical fibre carried out the test cell of synchronism detection and analyzing and processing; Said test cell be connected with processing unit; A plurality of A sides distortion teeth and a plurality of B side distortion tooth that said shaped form TCH test channel comprises the shaped form support and is laid in relative both sides on the said shaped form support continuously form the shaped form passage that supplies one or more signal optical fibres to pass between interleaved laying and the head of the two between a plurality of A sides distortion teeth and a plurality of B side distortion tooth, and A side distortion tooth and B side distortion tooth correspondence are laid in the signal optical fibre both sides.
Above-mentioned optical-fiber type backguy displacement sensing apparatus; Said gear unit is rotation axis and drive link; Said rotation axis is installed in inner walls through bearing one; Said drive link is connected with rotation axis is coaxial, and said substrate one is installed on the drive link and said substrate one is a threaded engagement with drive link, and said spiral spring is installed on the rotation axis.
Above-mentioned optical-fiber type backguy displacement sensing apparatus, said substrate two stationary housing inwalls.
Above-mentioned optical-fiber type backguy displacement sensing apparatus, said substrate two is provided with the adjustment screw rod that is slidingly matched with substrate two, and said adjustment screw rod passes housing, and said adjustment screw rod and housing threaded engagement.
Above-mentioned optical-fiber type backguy displacement sensing apparatus, said shaped form support is the shaped form housing, and said shaped form housing one end is fixed on the substrate one, and the other end of said shaped form housing is connected with substrate two through auxiliary spring.
Above-mentioned optical-fiber type backguy displacement sensing apparatus, said shaped form support is made up of spring, and A side distortion tooth and B side distortion tooth correspondence are laid in the spring between the adjacent two adjacent rings spring wire.
Above-mentioned optical-fiber type backguy displacement sensing apparatus, said shaped form support is made up of corrugated tube, and A side distortion tooth and B side distortion tooth correspondence are laid on the two opposite side surfaces of interior recess on the tube wall of corrugated tube.
Above-mentioned optical-fiber type backguy displacement sensing apparatus, said shaped form support parallel gullet plate by two with substrate to be formed, and signal optical fibre is clamped between two gullet plates, and said gullet plate is connected with substrate one through auxiliary spring.
Above-mentioned optical-fiber type backguy displacement sensing apparatus, an end of described signal optical fibre is mounted with light reflecting device, and the other end of signal optical fibre connects 1 mouthful of a 1X2 optical branching device through extended fiber, and 2 mouthfuls of the 1X2 optical branching device connect test cell.
The present invention compared with prior art has the following advantages:
1, it is convenient and use-pattern is flexible, highly sensitive that the present invention has simple in structure, reasonable in design, method of operating;
2, the present invention is because of using the fibre-optical bending sensing unit, make this device have anti-electromagnetic interference (EMI), highly sensitive, electrical insulating property good, safe and reliable, corrosion-resistant, can detect, be convenient to plurality of advantages such as multiplexing networking at a distance;
3, the present invention is because the light source that can adopt-luminous power method test, thereby can reduce the cost of test cell significantly, thereby the whole cost of this device is reduced significantly, makes this device have wide usable range.
4, the present invention is because of having utilized fibre-optical bending sensing unit high precision and high responsive characteristics; Thereby can select suitable backguy length practical requirement as required; Its backguy length can reach several meters to tens of meters scope easily, makes this device have wider usable range.
In sum; The present invention is simple in structure, reasonable in design, processing and fabricating convenient and use-pattern is flexible, highly sensitive, result of use is good; And have cost low, can detect, be prone to advantages such as networking is multiplexing at a distance, make device of the present invention have good use prospect.
Through accompanying drawing and embodiment, technical scheme of the present invention is done further detailed description below.
Description of drawings
Fig. 1 is the embodiment of the invention 1 structural representation.
Fig. 2 is the cross-sectional structure synoptic diagram of shaped form housing in the embodiment of the invention 1.
Fig. 3 is the embodiment of the invention 2 structural representations.
Fig. 4 is the embodiment of the invention 3 structural representations.
Fig. 5 is the embodiment of the invention 4 structural representations.
Fig. 6 is the cross-sectional structure synoptic diagram of the embodiment of the invention 4 medi-springs.
Fig. 7 is the embodiment of the invention 5 structural representations.
Fig. 8 is the partial structurtes synoptic diagram of corrugated tube in the embodiment of the invention 5.
Fig. 9 is the embodiment of the invention 6 structural representations.
Figure 10 is the embodiment of the invention 7 structural representations.
Figure 11 is the embodiment of the invention 8 structural representations.
Description of reference numerals:
| The 1-extended fiber; | 2-substrate one; | 3-substrate two; |
| 4-shaped form housing; | The 5-test cell; | The 7-processing unit; |
| The 10-housing; | The 11-rotation axis; | 12-bearing one; |
| The 13-reel; | The 15-backguy; | 16-spiral spring shell; |
| The 17-spiral spring; | The 18-drive link; | The 19-gullet plate; |
| The 20-pull wire head; | The 21-slide bar; | The 22-dividing plate; |
| 24-backguy mouth; | The 25-auxiliary spring; | 30-adjusts screw rod; |
| The 33-signal optical fibre; | The 38-spring; | The 40-corrugated tube; |
| The 42-tube wall; | The 45-1X2 optical branching device; | The 46-light reflecting device; |
| 4-1-A side distortion tooth; | 4-2-B side distortion tooth; | 47-bearing two. |
Embodiment
Like Fig. 1, a kind of optical-fiber type backguy displacement sensing apparatus shown in Figure 2; Comprise housing 10; Be provided with reel 13, backguy 15, spiral spring 17, slide bar 21, substrate 1, substrate 23 and gear unit in the said housing 10; Said backguy 15 is wrapped on the reel 13 and the end end of backguy 15 is fixed on the reel 13; The initiating terminal of said backguy 15 stretches out from said housing 10 through backguy mouth 24; The initiating terminal of said backguy 15 is provided with pull wire head 20; The input end of said gear unit is installed on the reel 13, and said substrate 1 is installed in the output terminal of gear unit, and said substrate 1 can be subjected to displacement by relative gear unit under the drive of gear unit; Said spiral spring 17 is installed in and is used for resetting to gear unit on the gear unit; And said spiral spring 17 is installed in the spiral spring shell 16, and an end of said slide bar 21 is movably arranged on the upper end of substrate 1, and the other end of said slide bar 21 is fixed on the housing 10 through substrate 23; Between substrate 1 and substrate 23, be laid with the fibre-optical bending sensing unit; Said fibre-optical bending sensing unit comprises signal optical fibre 33, supply shaped form TCH test channel that signal optical fibre 33 passes and join with signal optical fibre 33 and the optical signal power variable quantity in the signal optical fibre 33 is carried out the test cell 5 of synchronism detection and analyzing and processing, said test cell 5 be connected with processing unit 7, said shaped form TCH test channel comprises the shaped form support and is laid in continuously that a plurality of A sides distortion tooth 4-1 and a plurality of B side of both sides are out of shape tooth 4-2 relatively on the said shaped form support; Form the shaped form passage that supplies one or more signal optical fibres 33 to pass between interleaved laying and the head of the two between a plurality of A side distortion tooth 4-1 and a plurality of B side distortion tooth 4-2, A side distortion tooth 4-1 and B side distortion tooth 4-2 correspondence are laid in signal optical fibre 33 both sides.Rotation axis 11 is driven by reel 13 under the mobile traction of backguy 15; And make the change in location of the substrate 1 on the drive link 18 that is fixed together with rotation axis 11; Thereby the end positions of described fibre-optical bending sensing unit is changed; Described fibre-optical bending sensing unit converts the moving displacement of said backguy 15 into light signal, and said test cell 5 obtains this signal and it is passed to the treated size that obtains the moving displacement of backguy 15 in processing unit 7 backs.
In the present embodiment; Curved bracket is made up of shaped form housing 4; Said gear unit is rotation axis 11 and drive link 18, and said rotation axis 11 is installed in housing 10 inwalls through bearing 1, said drive link 18 and 11 coaxial connections of rotation axis; Said substrate 1 is installed on the drive link 18 and said substrate 1 is threaded engagement with drive link 18, and said spiral spring 17 is installed on the rotation axis 11.Be laid in a plurality of A side distortion tooth 4-1 and a plurality of B side distortion tooth 4-2 of described shaped form housing 4 inner both sides relatively; Described A side distortion tooth 4-1 and B side distortion tooth 4-2 interleaved are laid, and A side distortion tooth 4-1 and B side distortion tooth 4-2 correspondence are laid in the both sides of signal optical fibre 33.The bearing one 12 of rotation axis 11 through being individually fixed in housing 10 inwalls and bearing 2 47 location of dividing plate 22.Substrate 1 is flat boards that screw is arranged; On the drive link 18 screw thread is arranged, and the screw of this screw thread and substrate 1 is threaded engagement, substrate 23 is fixed in the inwall of housing 10; Slide bar 21 is fixed on the substrate 23; And substrate 1 is to be slidingly matched with slide bar 21, and shaped form housing 4 is fixedly connected with substrate 23 with substrate 1, and shaped form housing 4 is between substrate 1 and substrate 23; When drive link 18 rotates along with rotation axis 11; Substrate 1 moves under the effect of screw thread on the drive link 18, and the distance between substrate 1 and the substrate 23 just changes, and makes the variable in distance at shaped form housing 4 two ends; Being laid in a plurality of A sides distortion tooth 4-1 of relative both sides in the said shaped form housing 4 and the distance between a plurality of B side distortion tooth 4-2 changes; Thereby signal optical fibre 33 bending curvatures that are held on A, B both sides side distortion between cog are changed, test cell 5 through detection signal optical fiber 33 internal transmission optical signal powers variation and pass to processing unit 7, draw the size of the moving displacement of backguy 15 after processing unit 7 calculates.
Can according to actual needs test cell 5 and processing unit 7 and extended fiber 1 be placed in the housing 10, when the needs remote monitor, test cell 5 and processing unit 7 placed in the Control Room away from the monitoring point.
Said gear unit also can be made up of worm and gear or other mechanical hook-ups.
In housing 10, be filled with greasy for preventing water in order to waterproof and prolong serviceable life of signal optical fibre.
Said signal optical fibre 33 is for the outside optical fiber that is surrounded by multi-protective layer, like tight tube fiber, carbon coated fiber, polyimide coated optical fiber etc.; Said signal optical fibre 33 also can be plastic optical fiber, multi-core fiber, thin footpath optical fiber or photonic crystal fiber.
As shown in Figure 3, in the present embodiment, different with embodiment 1 is: said shaped form housing 4 one ends are fixed on the substrate 1, and the other end of said shaped form housing 4 is connected with substrate 23 through auxiliary spring 25.In the present embodiment, the structure of remainder, annexation and principle of work are all identical with embodiment 1.
As shown in Figure 4, in the present embodiment, different with embodiment 1 is: said substrate 23 is provided with the adjustment screw rod 30 that is slidingly matched with substrate 23, and said adjustment screw rod 30 passes housing 10, and said adjustment screw rod 30 and housing 10 threaded engagement.In the present embodiment, the structure of remainder, annexation and principle of work are all identical with embodiment 1.
Like Fig. 5, shown in Figure 6, in the present embodiment, different with embodiment 3 is: said shaped form support is made up of spring 38, and A side distortion tooth 4-1 and B side distortion tooth 4-2 correspondence are laid in the spring 38 between the adjacent two adjacent rings spring wire.In the present embodiment, the structure of remainder, annexation and principle of work are all identical with embodiment 3.
Like Fig. 7, shown in Figure 8; In the present embodiment; Different with embodiment 3 is: said shaped form support is made up of corrugated tube 40; In A side distortion tooth 4-1 and B side distortion tooth 4-2 correspondence are laid on the tube wall 42 of corrugated tube 40 on the two opposite side surfaces of recess, and A side distortion tooth 4-1 and B side are out of shape the interlaced laying of tooth 4-2.In the present embodiment, the structure of remainder, annexation and principle of work are all identical with embodiment 3.
Embodiment 6
As shown in Figure 9; In the present embodiment; Different with embodiment 3 is: said shaped form support parallels gullet plate 19 by two with substrate 20 to be formed, and signal optical fibre 33 is clamped between two gullet plates 19, and said gullet plate 19 is connected with substrate 1 through auxiliary spring 25.After drive link 18 rotates; Make the variable in distance between substrate 1 and the substrate 23, thereby the snap-in force between two gullet plates 19 is changed, the distance between two gullet plates 19 also just changes; The bending curvature of signal optical fibre 33 is changed, and test cell 5 detects this variation.
Signal optical fibre 33 can be laid in the mode of coiled coil between two gullet plates 19, prolongs the effective length of signal optical fibre 33, improves the precision of test.
Can certainly constitute two-layer or two-layer above little kinking structure by the gullet plate more than three or three 19, the effective length that prolongs signal optical fibre 33 improves the precision that detects.In the present embodiment, the structure of remainder, annexation and principle of work are all identical with embodiment 3.
Shown in figure 10; In the present embodiment; Different with embodiment 3 is: an end of described signal optical fibre 33 is mounted with light reflecting device 46, and the other end of signal optical fibre 33 connects 1 mouthful of a 1X2 optical branching device 45 through extended fiber 1, and 2 mouthfuls of 1X2 optical branching device 45 connect test cell 5.In the present embodiment, the structure of remainder, annexation and principle of work are all identical with embodiment 3.
Embodiment 8
Shown in figure 11; In the present embodiment; Different with embodiment 3 is: have two signal optical fibres 33 in the shaped form housing 4 that constitutes the fibre-optical bending sensing units to be cascaded through extended fiber 1, form the quasi-distributed optical fiber sensor-based system, a kind of preferred way is to be mounted with light reflecting device 46 on the extended fiber 1 between in two shaped form housings 4; Like fiber grating, certainly preferred way is to select the fiber grating of antiradar reflectivity for use.At this moment the preferably use optical time domain reflectometer (OTDR) of test cell 5; Test curve through optical time domain reflectometer can obtain any variation to be measured; Further can reflect the variation to be measured of these light reflecting device 46 fronts, thereby further improve measuring accuracy through the height of measuring light reflection unit 46.In the present embodiment, the structure of remainder, annexation and principle of work are all identical with embodiment 3.
The above; It only is preferred embodiment of the present invention; Be not that the present invention is done any restriction, every technical spirit all still belongs in the protection domain of technical scheme of the present invention any simple modification, change and equivalent structure transformation that above embodiment did according to the present invention.
Claims (9)
1. optical-fiber type backguy displacement sensing apparatus; It is characterized in that: comprise housing (10); Be provided with reel (13), backguy (15), spiral spring (17), slide bar (21), substrate one (2), substrate two (3) and gear unit in the said housing (10); Said backguy (15) is wrapped in reel (13) end end last and backguy (15) and is fixed on the reel (13); The initiating terminal of said backguy (15) stretches out from said housing (10) through backguy mouth (24); The initiating terminal of said backguy (15) is provided with pull wire head (20); The input end of said gear unit is installed on the reel (13); Said substrate one (2) is installed in the output terminal of gear unit; Said substrate one (2) can be subjected to displacement by relative gear unit under the drive of gear unit; Said spiral spring (17) is installed in and is used on the gear unit the resetting of gear unit, and an end of said slide bar (21) is movably arranged on the upper end of substrate one (2), and the other end of said slide bar (21) is fixed on the housing (10) through substrate two (3); Between substrate one (2) and substrate two (3), be laid with the fibre-optical bending sensing unit; Said fibre-optical bending sensing unit comprises signal optical fibre (33), supply shaped form TCH test channel that signal optical fibre (33) passes and join with signal optical fibre (33) and the optical signal power variable quantity in the signal optical fibre (33) is carried out the test cell (5) of synchronism detection and analyzing and processing, said test cell (5) be connected with processing unit (7), said shaped form TCH test channel comprises the shaped form support and is laid in continuously that a plurality of A sides distortion teeth (4-1) and a plurality of B side of both sides are out of shape tooth (4-2) relatively on the said shaped form support; Form the shaped form passage that supplies one or more signal optical fibres (33) to pass between interleaved laying and the head of the two between a plurality of A side distortion teeth (4-1) and a plurality of B side distortion tooth (4-2), A side distortion tooth (4-1) and B side distortion tooth (4-2) correspondence are laid in signal optical fibre (33) both sides.
2. optical-fiber type backguy displacement sensing apparatus according to claim 1; It is characterized in that: said gear unit is rotation axis (11) and drive link (18); Said rotation axis (11) is installed in housing (10) inwall through bearing one (12); Said drive link (18) and coaxial connection of rotation axis (11), said substrate one (2) are installed in that drive link (18) is gone up and said substrate one (2) is a threaded engagement with drive link (18), and said spiral spring (17) is installed on the rotation axis (11).
3. optical-fiber type backguy displacement sensing apparatus according to claim 2 is characterized in that: said substrate two (3) stationary housing (10) inwalls.
4. optical-fiber type backguy displacement sensing apparatus according to claim 2; It is characterized in that: said substrate two (3) is provided with the adjustment screw rod (30) that is slidingly matched with substrate two (3); Said adjustment screw rod (30) passes housing (10), and said adjustment screw rod (30) and housing (10) threaded engagement.
5. optical-fiber type backguy displacement sensing apparatus according to claim 4; It is characterized in that: said shaped form support is shaped form housing (4); Said shaped form housing (4) one ends are fixed on the substrate one (2), and the other end of said shaped form housing (4) is connected with substrate two (3) through auxiliary spring (25).
6. optical-fiber type backguy displacement sensing apparatus according to claim 4 is characterized in that: said shaped form support is made up of spring (38), and A side distortion tooth (4-1) and B side are out of shape tooth (4-2) correspondence and are laid in the spring (38) between the adjacent two adjacent rings spring wire.
7. optical-fiber type backguy displacement sensing apparatus according to claim 4; It is characterized in that: said shaped form support is made up of corrugated tube (40), and A side distortion tooth (4-1) and B side distortion tooth (4-2) correspondence are laid in the tube wall (42) of corrugated tube (40) and go up on the two opposite side surfaces of interior recess.
8. optical-fiber type backguy displacement sensing apparatus according to claim 4; It is characterized in that: said shaped form support parallels gullet plate (19) by two with substrate (20) and forms; Signal optical fibre (33) is clamped between two gullet plates (19), and said gullet plate (19) is connected with substrate one (2) through auxiliary spring (25).
9. optical-fiber type backguy displacement sensing apparatus according to claim 4; It is characterized in that: an end of described signal optical fibre (33) is mounted with light reflecting device (46); The other end of signal optical fibre (33) is through 1 mouthful of extended fiber (1) connection one 1X2 optical branching device (45), and 2 mouthfuls of 1X2 optical branching device (45) connect test cell (5).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105584345A CN102478388A (en) | 2010-11-24 | 2010-11-24 | Optical fiber-type pull wire displacement sensing device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010105584345A CN102478388A (en) | 2010-11-24 | 2010-11-24 | Optical fiber-type pull wire displacement sensing device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104596459A (en) * | 2015-01-21 | 2015-05-06 | 中核华泰建设有限公司 | Landslide monitoring system and monitoring method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104596459A (en) * | 2015-01-21 | 2015-05-06 | 中核华泰建设有限公司 | Landslide monitoring system and monitoring method thereof |
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Application publication date: 20120530 |