CN114234814B - Deep horizontal displacement monitoring sensor and displacement monitoring system - Google Patents
Deep horizontal displacement monitoring sensor and displacement monitoring system Download PDFInfo
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- CN114234814B CN114234814B CN202111297933.8A CN202111297933A CN114234814B CN 114234814 B CN114234814 B CN 114234814B CN 202111297933 A CN202111297933 A CN 202111297933A CN 114234814 B CN114234814 B CN 114234814B
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 77
- 238000006073 displacement reaction Methods 0.000 title claims abstract description 44
- 229910052751 metal Inorganic materials 0.000 claims abstract description 74
- 239000002184 metal Substances 0.000 claims abstract description 74
- 239000013307 optical fiber Substances 0.000 claims abstract description 45
- 238000004891 communication Methods 0.000 claims description 20
- 230000002093 peripheral effect Effects 0.000 claims description 6
- 230000000149 penetrating effect Effects 0.000 claims description 5
- 239000007787 solid Substances 0.000 claims description 4
- 238000004062 sedimentation Methods 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 description 10
- 238000000034 method Methods 0.000 description 7
- 230000003287 optical effect Effects 0.000 description 7
- 238000010276 construction Methods 0.000 description 4
- 239000000835 fiber Substances 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
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- 238000005259 measurement Methods 0.000 description 3
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Abstract
The embodiment of the invention discloses a deep horizontal displacement monitoring sensor and a displacement monitoring system, which comprise a sensor unit, wherein the sensor unit comprises: a first metal sleeve; the second metal sleeve is axially arranged at intervals with the first metal sleeve; one end of the rubber column is penetrated into the first metal sleeve, the other end of the rubber column is penetrated into the second metal sleeve, and the rubber column is provided with an exposed deformation section positioned in the interval between the first metal sleeve and the second metal sleeve; the optical fiber is embedded in the rubber column along the axial direction; and the weak grating is arranged on the optical fiber. The first metal sleeve and the second metal sleeve can play a role in shielding, and electromagnetic interference in a monitored field environment is prevented, so that the accuracy of monitored data is ensured, and errors are reduced; and the deformation section is exposed, so that the monitoring sensor has deformation capability, can generate deformation along with displacement, sedimentation and the like, and can ensure the coordinated deformation of the monitoring variable.
Description
Technical Field
The invention relates to the technical field of automatic monitoring, in particular to a deep horizontal displacement monitoring sensor and a displacement monitoring system.
Background
Currently, in various real-time monitoring projects such as side slope slippage, tunnel construction, road subgrade settlement, bridge deflection, water conservancy dam settlement, side movement, building construction and the like, the monitoring content mainly covers deep displacement and surface displacement so as to achieve the early warning effect, prompt feedback information, timely eliminate the problems of potential safety hazards and construction quality and ensure life and property safety.
For example, for monitoring deep displacement, three methods are mainly adopted in the industry at present: firstly, a manual inclinometer is adopted, so that the technology is mature, the application range is wide, but the disadvantage is that the manual operation of a measuring worker is needed, and the time and the labor are wasted; secondly, an array displacement meter is adopted, so that the automatic unmanned monitoring is realized, and meanwhile, the torsion of the inclinometer tube with smaller amplitude can be corrected, but the defects are that the on-site electromagnetic interference is easy to influence the measurement accuracy; thirdly, the conventional fiber bragg grating dip angle tester has the advantages of realizing automatic monitoring, being free from on-site electromagnetic interference, but has the disadvantages of poor cooperative deformability and high monitoring cost caused by high price of the distributed demodulator.
Disclosure of Invention
In view of the above, the invention provides a deep level displacement monitoring sensor and a displacement monitoring system, which are used for solving the problems of low measurement precision and poor collaborative deformation capability caused by electromagnetic interference due to time-consuming and labor-consuming operation in the prior art.
To achieve one or some or all of the above or other objects, the present invention provides a deep level displacement monitoring sensor comprising a sensor unit comprising:
a first metal sleeve;
a second metal sleeve axially spaced from the first metal sleeve;
one end of the rubber column penetrates through the first metal sleeve, the other end of the rubber column penetrates through the second metal sleeve, and the rubber column is provided with an exposed deformation section located in the interval between the first metal sleeve and the second metal sleeve;
the optical fiber is embedded in the rubber column along the axial direction; and
and the weak grating is arranged on the optical fiber.
In one embodiment, the outer peripheral wall of the rubber column is in close contact with the inner cylinder wall of the first metal sleeve; the outer peripheral wall of the rubber column is in close contact with the inner cylinder wall of the second metal sleeve.
In one embodiment, the rubber column is provided with a containing hole extending along the axial direction, and the optical fiber is arranged in the containing hole in a penetrating way.
In one embodiment, the rubber posts are provided as solid structures.
In one embodiment, the deep horizontal displacement monitoring sensor further comprises a supporting framework, wherein the supporting framework is buried in the rubber column, and the supporting framework is positioned at the position where the deformation section is exposed.
In one embodiment, the optical fibers are disposed on the support skeleton; the optical fibers are arranged in a plurality, and the optical fibers are circumferentially arranged on the periphery of the supporting framework at intervals.
In one embodiment, the supporting framework comprises a framework body, a first framework end and a second framework end, wherein the framework body is located in the exposed deformation section, the first framework end is connected to one end of the framework body in the length direction and located in the first metal sleeve, and the second framework end is connected to the other end of the framework body in the length direction and located in the second metal sleeve.
In one embodiment, the first skeleton end and the second skeleton end are both provided with a conical cylindrical structure, and the small ends of the two conical cylindrical structures are connected with the skeleton body, and the large ends of the two conical cylindrical structures are far away from the skeleton body.
In one embodiment, a plurality of sensor units are arranged, and the plurality of sensor units are connected in series in sequence.
A displacement monitoring system, comprising:
a deep level displacement monitoring sensor as described above;
the data acquisition equipment is in communication connection with the deep horizontal displacement monitoring sensor;
the communication equipment is in communication connection with the data acquisition equipment; and
and the monitoring cloud platform is in communication connection with the communication equipment.
The implementation of the embodiment of the invention has the following beneficial effects:
the deep horizontal displacement monitoring sensor is specifically composed of a sensor unit, when the sensor is used, firstly, a weak grating and an optical fiber are processed into a whole, then the whole is arranged in a rubber column, finally, the rubber column is respectively matched and nested with a first metal sleeve and a second metal sleeve, and the first metal sleeve and the second metal sleeve are arranged at intervals, so that the part of the rubber column in the interval forms an exposed deformation section. When the device works, the weak grating is matched with the optical fiber to measure a target, and the OFDR (optical frequency domain reflection) technology is adopted by means of the weak grating demodulation, so that the device can realize full-automatic monitoring operation and reduce the overall monitoring cost; in addition, the first metal sleeve and the second metal sleeve can play a role in shielding in the monitoring process, and electromagnetic interference in the monitored field environment is prevented, so that the accuracy of monitoring data is ensured, and errors are reduced; and the deformation section is exposed, so that the monitoring sensor has deformation capability, can generate deformation along with displacement, sedimentation and the like, and can ensure the coordinated deformation of the monitoring variable.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Wherein:
FIG. 1 is a block diagram of a displacement monitoring system according to an embodiment of the present disclosure;
FIG. 2 is a schematic diagram of the sensor unit of the present application;
FIG. 3 is an internal block diagram of FIG. 2;
fig. 4 is a right-side view of the structure of fig. 3.
Reference numerals illustrate:
100. a deep horizontal displacement monitoring sensor; 10. a sensor unit; 11. a first metal sleeve; 12. a second metal sleeve; 13. a rubber column; 131. exposing the deformed section; 14. an optical fiber; 15. a weak grating; 16. a support skeleton; 161. a skeleton body; 162. a first skeletal end; 163. a second framework end; 200. a data acquisition device; 300. a communication device; 400. monitoring the cloud platform.
Detailed Description
In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the invention, whereby the invention is not limited to the specific embodiments disclosed below.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
As shown in fig. 1, the displacement monitoring system according to the embodiment of the present application is applied to various different real-time monitoring projects such as slope slippage, tunnel construction, road subgrade settlement, bridge deflection, water conservancy dam settlement, lateral movement, building construction, etc., where the monitoring content mainly covers deep displacement and surface displacement, so as to achieve the early warning effect, prompt feedback information, timely eliminate the problems of potential safety hazards and construction quality, and ensure life and property safety.
In this scheme, displacement monitoring system includes: the deep level displacement monitoring sensor 100, the data acquisition equipment 200, the communication equipment 300 and the monitoring cloud platform 400. The data acquisition equipment 200 is in communication connection with the deep horizontal displacement monitoring sensor 100; the communication device 300 is in communication connection with the data acquisition device 200; the monitoring cloud platform 400 is in communication connection with the communication device 300.
The deep horizontal displacement monitoring sensor 100 is used for sensing the horizontal displacement of a monitoring target, and the data acquisition device 200 is used for acquiring monitoring data from the deep horizontal displacement monitoring sensor 100 and transmitting the monitoring data to the communication device 300; the communication device 300 is configured to further transmit the monitoring data to the monitoring cloud platform 400; finally, the monitoring cloud platform 400 analyzes and processes the received monitoring data and manages the monitoring data.
Specifically, as shown in fig. 2, a deep level displacement monitoring sensor 100 according to an embodiment of the present application includes a sensor unit 10, where the sensor unit 10 includes: a first metal sleeve 11, a second metal sleeve 12, a rubber column 13, an optical fiber 14 and a weak grating 15.
The second metal sleeve 12 is axially spaced from the first metal sleeve 11. It will be appreciated that the first metal sleeve 11 is coaxially arranged with the second metal sleeve 12 when not subjected to an external force. When the monitoring target (such as soil layer) is displaced, the first metal sleeve 11 and the second metal sleeve 12 are displaced or rotated relatively, and are not coaxially arranged.
Alternatively, the first metal sleeve 11 and the second metal sleeve 12 may be made of any one of stainless steel, copper, aluminum alloy, and the like.
One end of the rubber column 13 is arranged inside the first metal sleeve 11 in a penetrating way, the other end of the rubber column 13 is arranged inside the second metal sleeve 12 in a penetrating way, and the rubber column 13 is provided with an exposed deformation section 131 positioned in the interval between the first metal sleeve 11 and the second metal sleeve 12; the optical fiber 14 is embedded in the rubber column 13 along the axial direction; the weak grating 15 is disposed on the optical fiber 14.
In summary, implementing the technical scheme of the embodiment has the following beneficial effects: the deep level displacement monitoring sensor 100 of the above scheme is specifically formed by the sensor unit 10, when in use, firstly, the weak grating 15 and the optical fiber 14 are processed into a whole, then the whole is put into the rubber column 13, finally, the rubber column 13 is respectively matched and nested with the first metal sleeve 11 and the second metal sleeve 12, and the first metal sleeve 11 and the second metal sleeve 12 are arranged at intervals, so that the part of the rubber column 13 in the intervals forms the exposed deformation section 131. When the optical fiber monitoring system works, the weak grating 15 is matched with the optical fiber 14 to measure a target, and the OFDR (optical frequency domain reflection) technology is adopted by means of demodulation of the weak grating 15, so that the full-automatic monitoring operation can be realized, and the overall monitoring cost is reduced; in addition, the first metal sleeve 11 and the second metal sleeve 12 can play a role in shielding in the monitoring process, and electromagnetic interference in the monitored field environment is prevented, so that the accuracy of monitoring data is ensured, and errors are reduced; and the deformation section 131 is exposed, so that the monitoring sensor has deformation capability, can generate deformation along with displacement, sedimentation and the like, and can ensure the coordinated deformation of the monitoring variable.
The OFDR (optical frequency domain reflection technology) is a back reflection technology based on rayleigh scattering in the optical fiber 14, the linear sweep frequency light emitted by the light source is divided into two paths by the coupler, one path enters the optical fiber 14 to be detected, the rayleigh scattering signals are continuously generated at each position of the optical fiber 14, the signal light is back-facing, and the signal light is coupled to the detector with the other path of reference light for coherent mixing. The optical fiber 14 to be measured has different optical frequencies and different frequency differences between the signal light and the reference light. When light is transmitted forward in the optical fiber 14, the rayleigh scattering signals generated at different locations carry this loss information when defects occur in the optical fiber 14 to generate losses. The frequency detection of the rayleigh scattering signal light can accurately locate fusion points, bends, break points and the like occurring along the optical fiber 14. The OFDR technique is to diagnose the link of the optical fiber 14 by the principle described above.
The OFDR technology is a technology for detecting an optical signal in the optical fiber 14 by utilizing a swept-frequency light source coherent detection technology, and is not limited by contradiction between spatial resolution and dynamic range, and the OFDR technology has the characteristics of high spatial resolution (the optical measurement can reach 10 μm), large dynamic range, high test sensitivity and the like, and is suitable for the fields of short-distance high-precision monitoring such as internal analysis of optical devices, civil engineering simulation test, vehicle structure research and the like.
In addition, the weak grating 15 and the optical fiber 14 are manufactured by an on-line grating writing technology. The technique is to write a plurality of gratings once by using a phase mask method before polymer coating on the surface of the optical fiber 14, and determine the writing interval of each grating according to the practical application requirement. Wherein the optical fiber 14 grating inside the supporting framework 16 is kept in a compact state by pretension, so that the testing precision of the optical fiber 14 grating can be kept.
Of course, in other embodiments, the weak fiber 14 grating array may be replaced by a manual connection fiber 14 grating array technique or an auxiliary stripping connection fiber 14 grating array technique.
In some embodiments, the outer peripheral wall of the rubber column 13 is in close contact with the inner cylinder wall of the first metal sleeve 11; the outer peripheral wall of the rubber column 13 is in close contact with the inner cylindrical wall of the second metal sleeve 12. Therefore, the rubber column 13, the first metal sleeve 11 and the second metal sleeve 12 can be stably assembled, the connecting strength is high, and the relative positions of the rubber column 13, the first metal sleeve 11 and the second metal sleeve 12 are fixed, so that the exposed deformation section 131 is always positioned in the interval between the first metal sleeve 11 and the second metal sleeve 12, and the monitoring sensor has excellent deformation capability.
In addition, the assembly clearance can be eliminated after the tight contact, so that rainwater and the like can be prevented from penetrating into the first metal sleeve 11 and the second metal sleeve 12, and corrosion damage is caused to the first metal sleeve 11, the second metal sleeve 12 and the rubber column 13.
In some embodiments, the rubber column 13 is provided with a receiving hole extending along an axial direction, and the optical fiber 14 is inserted into the receiving hole. In this way, the optical fiber 14 is mounted in a simple manner, and is reliably and firmly connected to the rubber column 13.
Preferably, the rubber column 13 is provided as a solid structure in this embodiment. The rubber column 13 is designed into a solid structure, and besides the excellent elastic deformation capability, the rubber column 13 also maintains certain structural strength, so that excessive deformation and even breakage caused by external force are avoided.
In addition, on the basis of any of the above embodiments, the deep horizontal displacement monitoring sensor 100 further includes a support skeleton 16, where the support skeleton 16 is embedded in the rubber column 13, and the support skeleton 16 is located at the portion where the deformation section 131 is exposed. The supporting framework 16 is used for further reinforcing the strength of the exposed deformation section 131 of the rubber column 13, and guaranteeing good deformation capability under the action of external force.
The optical fibers 14 are disposed on the support frame 16. So that the optical fiber 14 can be supported by the support frame 16 and the installation stability can be ensured. Preferably, the optical fibers 14 are provided in plurality, and the optical fibers 14 are circumferentially arranged around the outer periphery of the supporting frame 16 at intervals. The multi-optical fiber 14 is adopted for horizontal displacement monitoring and monitoring signal transmission, so that the reliability is higher, and after any one optical fiber 14 is damaged, the other optical fibers 14 can still ensure normal operation.
In some embodiments, the support frame 16 includes a frame body 161, a first frame end 162 and a second frame end 163, the frame body 161 is located inside the exposed deformation section 131, the first frame end 162 is connected to one end of the frame body 161 in the length direction and is located inside the first metal sleeve 11, and the second frame end 163 is connected to the other end of the frame body 161 in the length direction and is located inside the second metal sleeve 12. Therefore, the support frame 16 has a simple structure, and is easy to mold and manufacture and low in cost.
It will be appreciated that the support frame 16 may be machined from smaller diameter metal bars by welding or the like. The support frame 16 in this embodiment is specifically made in the form of a cylinder,
further, the first skeleton end 162 and the second skeleton end 163 are both configured as a conical cylindrical structure, and the small ends of the two conical cylindrical structures are connected to the skeleton body 161, and the large ends of the two conical cylindrical structures are far away from the skeleton body 161. Thus, the combination area of the first skeleton end 162 and the second skeleton end 163 and the rubber column 13 is increased, the connection is firmer, and when the exposed deformation section 131 is subjected to bending deformation, the support skeleton 16 is not easy to shift, so that the support effect on the exposed deformation section 131 is ensured.
Optionally, in this embodiment, the supporting framework 16 adopts a less rigid iron frame, which can deform along with the exposed deformation section 131 along with the displacement of the deep soil body.
Furthermore, on the basis of any of the above embodiments, a plurality of the sensor units 10 are provided, and a plurality of the sensor units 10 are connected in series in order. The detection sensor can obtain a longer length, can reach a deeper and more remote monitoring target (such as a deep soil body), greatly improves the monitoring capability and widens the application range.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (3)
1. A deep level displacement monitoring sensor comprising a sensor unit, the sensor unit comprising:
a first metal sleeve;
a second metal sleeve axially spaced from the first metal sleeve;
one end of the rubber column penetrates through the first metal sleeve, the other end of the rubber column penetrates through the second metal sleeve, and the rubber column is provided with an exposed deformation section located in the interval between the first metal sleeve and the second metal sleeve;
the optical fiber is embedded in the rubber column along the axial direction; and
the weak grating is arranged on the optical fiber;
the deep horizontal displacement monitoring sensor further comprises a supporting framework, wherein the supporting framework is buried in the rubber column, and the supporting framework is positioned at the position of the exposed deformation section;
the support framework comprises a framework body, a first framework end and a second framework end, wherein the framework body is positioned in the exposed deformation section, the first framework end is connected to one end of the framework body in the length direction and is positioned in the first metal sleeve, the second framework end is connected to the other end of the framework body in the length direction and is positioned in the second metal sleeve, the first framework end and the second framework end are of cone-shaped structures, and the small ends of the two cone-shaped structures are connected with the framework body;
the outer peripheral wall of the rubber column is tightly contacted with the inner cylinder wall of the first metal sleeve; the outer peripheral wall of the rubber column is tightly contacted with the inner cylinder wall of the second metal sleeve;
the large ends of the two cone-shaped cylindrical structures are far away from the skeleton body;
the rubber column is provided with an accommodating hole extending along the axial direction, and the optical fiber is arranged in the accommodating hole in a penetrating way;
the rubber column is arranged to be of a solid structure;
the optical fiber is arranged on the supporting framework; the optical fibers are arranged in a plurality, and the optical fibers are circumferentially arranged on the periphery of the supporting framework at intervals.
2. The deep level shift monitoring sensor of claim 1, wherein a plurality of sensor units are provided, and a plurality of the sensor units are sequentially connected in series.
3. A displacement monitoring system, comprising:
deep level displacement monitoring sensor according to any one of the preceding claims 1 to 2;
the data acquisition equipment is in communication connection with the deep horizontal displacement monitoring sensor;
the communication equipment is in communication connection with the data acquisition equipment; and
and the monitoring cloud platform is in communication connection with the communication equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202111297933.8A CN114234814B (en) | 2021-11-04 | 2021-11-04 | Deep horizontal displacement monitoring sensor and displacement monitoring system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111297933.8A CN114234814B (en) | 2021-11-04 | 2021-11-04 | Deep horizontal displacement monitoring sensor and displacement monitoring system |
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| CN114234814A CN114234814A (en) | 2022-03-25 |
| CN114234814B true CN114234814B (en) | 2024-03-29 |
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| JP2007114176A (en) * | 2005-09-22 | 2007-05-10 | Tobishima Corp | Displacement measurement device and system |
| CN101713650A (en) * | 2009-12-10 | 2010-05-26 | 中国科学院水利部成都山地灾害与环境研究所 | Fiber bragg grating inclinometer and inclinometry algorithm |
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| CN112461151A (en) * | 2020-11-20 | 2021-03-09 | 中国地质调查局水文地质环境地质调查中心 | Deep deformation monitoring device and method based on weak grating |
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2021
- 2021-11-04 CN CN202111297933.8A patent/CN114234814B/en active Active
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| JP2007114176A (en) * | 2005-09-22 | 2007-05-10 | Tobishima Corp | Displacement measurement device and system |
| CN101713650A (en) * | 2009-12-10 | 2010-05-26 | 中国科学院水利部成都山地灾害与环境研究所 | Fiber bragg grating inclinometer and inclinometry algorithm |
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