CN201697613U - Composite optical fiber detection module and device - Google Patents
Composite optical fiber detection module and device Download PDFInfo
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- CN201697613U CN201697613U CN2010201109719U CN201020110971U CN201697613U CN 201697613 U CN201697613 U CN 201697613U CN 2010201109719 U CN2010201109719 U CN 2010201109719U CN 201020110971 U CN201020110971 U CN 201020110971U CN 201697613 U CN201697613 U CN 201697613U
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Abstract
The utility model discloses a composite optical fiber detection module comprising a substrate with a bearing surface, wherein the bearing surface of the substrate is provided with an optical fiber structure I, an optical fiber structure II and an optical fiber structure III which are parallel up and down; the optical fiber structure I is a tubular structure and used for large-range measurement of the shearing force; the optical fiber structure II is an independent optical fiber structure and used for initial high-accuracy measurement of the shearing force; and the optical fiber structure III is an embedded structure and used for direction judgment. The composite optical fiber detection module can realize the large-range measurement, initial high-accuracy measurement and direction judgement through three different optical fiber structures arranged on the bearing surface of the same substrate, and the acquired information is accurate and complete. In the actual using process, a plurality of composite optical fiber detection modules can be connected together to form a three-dimensional structure or to extend horizontally along the same direction, and the application flexibility of the module is greatly enhanced. In addition, the utility model also discloses a composite optical fiber detection device.
Description
Technical field
The utility model relates to the technical field that adopts fiber device to realize distortion and direction of motion synchro measure, particularly a kind of composite fiber detection module and composite fiber pick-up unit.
Background technology
China is one of the most serious country of geologic hazard in the world, every year is hundreds of millions of by the loss that side slope unstability disasters such as landslide cause, had a strong impact on the people's the security of the lives and property, therefore, setting up effective monitoring network, prediction in time and protection becomes resisting nature disaster, becomes the important channel of mitigation.
Optical fiber sensing technology be by to transmission light some parameter in the optical fiber (as intensity, phase place, frequency, polarization state etc.) measurement of Bian Huaing, realization is to the measurement of environmental parameter, the distributing optical fiber sensing technology has been widely used in the engineering survey field, Fibre Optical Sensor is to utilize the carrier of light as information, with the medium of optical fiber as the information of transmission, has anti-electromagnetic interference (EMI), corrosion-resistant, highly sensitive, response is fast, in light weight, volume is little, shape variable, roomy and the reusable of transport tape is realized advantages such as distributed measurement, China was applied to landslide monitoring in 2004 with the distributing optical fiber sensing technology, and had obtained significant achievement.
At present, Time Domain Reflectometry (TDR) monitoring technology, optical time domain reflection technology and Brillouin's optical time domain reflection technology (BOTDR) based on concentric cable are the focuses of domestic research, but these several technology are when being used for the stability of slope monitoring, defectiveness all separately, wherein, it is poor that TDR makes time spent susceptibility in no shearing force, therefore, be difficult to act on initial precision height, measurement occasion that stroke is big, OTDR has high initial precision in application, but is difficult to realize wide range and direction deciding; Though and BOTDR has the advantage that the light signal loss is little, range finding is long, and simple optical fiber is cheap, can determine the position of distortion more easily, it is less that it measures stroke, and realizing also awaiting research aspect the direction deciding.
Generally speaking, at present domestic research in this field also has than big gap with external, in the measurement of side slope unstability geologic structure, needs a kind of light detection means that can realize that the initial high precision of shearing force, large range measuring and orientation are judged.
The utility model content
In view of this, the utility model provides a kind of composite fiber detection module, this module has adopted three kinds of optical fiber structures, can carry out initial high precision, large range measuring and the orientation of shearing force simultaneously judges, characteristics with the high and low cost of precision, based on this detection module, the utility model has also proposed a kind of composite fiber pick-up unit, by with detect combining of main frame, can comprehensively judge accurately the direction and the character of target object internal motion, provide effective information for further taking some countermeasures.
One of the purpose of this utility model is achieved through the following technical solutions: this composite fiber detection module comprises the base material with stressed loading end, and the stressed loading end of described base material is provided with optical fiber structure I arranged side by side, optical fiber structure II and optical fiber structure III;
Described optical fiber structure I is a tubular structure, comprises optical fiber I and steel pipe, and the part that described optical fiber I is positioned on the stressed loading end is protected by the suit steel pipe, and optical fiber I is provided with bowknot, and described optical fiber structure I is used for the large range measuring of shearing force; Described optical fiber structure II is the independent body optical fiber structure, comprises the optical fiber II that is set directly on the stressed loading end, and described optical fiber structure II is used for the initial high-acruracy survey and the position probing of shearing force; Described optical fiber structure III adopts embedded strain structure, comprise optical fiber III and strain mounted substrate I, described optical fiber III is two and embeds the upper and lower surface that is installed on strain mounted substrate I in the mode that is parallel to each other respectively, the lower surface of described strain mounted substrate I is arranged on the stressed loading end in the mode of face contact, described optical fiber III and optical fiber I, optical fiber II keeping parallelism, described optical fiber structure III are used for the orientation of shearing force and judge.
Further, described optical fiber structure III also comprises strain mounted substrate II, be respectively arranged with two optical fiber IV that are parallel to each other on the upper and lower surface of described strain mounted substrate II, described strain mounted substrate II is arranged on the strain mounted substrate I, the upper and lower surface of the upper and lower surface of described strain mounted substrate II and strain mounted substrate I keeps orthogonal vertical, described optical fiber IV and optical fiber III are parallel to each other, by the setting of strain mounted substrate I, II, determined level direction and vertical direction is stressed simultaneously.
Certainly, also can not adopt above-mentioned perpendicular quadrature structure, directly optical fiber III be adopted grating fibers, carry out the orientation by the characteristic of grating fibers and judge that the sensitivity of this kind mode is also higher, cost is comparatively expensive simultaneously.
Further, be set with the soft sleeve pipe that is used to protect optical fiber of whole radical on the described optical fiber II.
In addition, described optical fiber II also can adopt another casing protection structure, promptly the embedment length at optical fiber II upper edge optical fiber II is set with the identical cover tube coupling of a plurality of structures successively, the length of described cover tube coupling is greater than 1mm and less than 15mm, external diameter is 0.5～2mm, internal diameter is 0.3～1.6mm, and under external force, described optical fiber II forms zigzag structure by the cover tube coupling;
Further, described base material is provided with coupling arrangement, constitutes spatial structure with single or a plurality of stressed loading ends by coupling arrangement between described a plurality of composite fiber detection modules or extends along same direction plane.
Composite fiber detection module of the present utility model adopts the composite structure of being made up of three kinds of optical fiber structures, wherein optical fiber structure I has adopted the design of outer steel pipe, at independent body optical fiber in the excessive disadvantage that fractures easily of displacement, the optical fiber of this structure is owing to be subjected to the protection of steel pipe, the distance that the crack produces can make steel pipe that thereby slip drive optical fiber takes place in device and move together, bowknot is shunk, thereby produce the variation of correlation parameter, be very suitable for the large range measuring of shearing force; And optical fiber structure II adopts the independent body structure or adds that the suitable soft sleeve pipe in aperture plays a protective role, and is suitable for initial high-acruracy survey; Optical fiber structure III is by embedding optical fiber on the strain mounted substrate, and the strain mounted substrate that will make one again is installed on the matrix, thereby can realize the judgement in orientation and the measurement of stress intensity.
Because base material is provided with coupling arrangement, so can connect as required between a plurality of composite fiber detection module, composition has the spatial structure of one or more stressed loading ends, realizes measuring more accurately.
Two of the purpose of this utility model is achieved through the following technical solutions: this composite fiber pick-up unit, comprise foregoing composite fiber detection module, and also comprise the detection main frame that receives fiber-optic signal and handle.
For the compound detection module that adopts strain mounted substrate I, II perpendicular quadrature structure, described detection main frame links and receives fiber-optic signal by multidiameter option switch and three road optical fiber and handles, and described detection main frame adopts the Brillouin light domain reflectometer.Concrete principle promptly emits light into different numberings by MUX with a light source and represents in the optical fiber of different azimuth, because being subjected to tension and compression effect meeting, optical fiber produces the variation of back reflective light frequency then, thereby the characteristic of utilizing the BOTDR instrument to detect frequency change is carried out the frequency change differences that measurement of correlation obtains different numbering optical fiber, just can be used for whether stressed and stressed size of definite this numbering representative orientation.
For adopting the compound detection module of carving the optical fiber that is provided with grating, detect main frame and comprise optical time domain reflectometer and optical fiber tuner, spectrometer, wherein, optical time domain reflectometer is used to connect optical fiber I and optical fiber II, described optical fiber tuner is used to be connected optical fiber III with spectrometer, the measuring principle of optical fiber III is as follows: the optical fiber tuner injects single-frequency light with different numberings and represent the scattered light of the optical fiber of different azimuth → be subjected to external influence → generations frequency shift → detect light frequency change amount → draw different change amount sizes of numbering generation at last with spectrometer, thereby just can instead release whether stressed and stressed size of this direction.
The beneficial effects of the utility model are:
1. composite fiber detection module of the present utility model can realize that by three kinds of different optical fiber structures are set initial high-acruracy survey, large range measuring and the orientation of shearing force judges that the information of its acquisition is accurately comprehensive on the stressed loading end of same base material; In actual use, a plurality of composite fiber detection modules can interconnect, and form spatial structure or along same direction plane extension, have strengthened the dirigibility of module application greatly;
2. composite fiber detection module is cooperated with optical time domain reflectometer or Brillouin light domain reflectometer and form the composite fiber pick-up unit, control simply, monitoring effect is good; Simultaneously, fiber transmission attenuation is little, and optical fiber can transfer to signal data a distant place and realize remote monitoring, does not influence the precision and the accuracy of monitoring, and its function is more complete, and efficient is higher; In addition, composite fiber detection module of the present utility model also can adopt the structure of grating fibers, cooperates with optical fiber tuner and spectrometer to form another kind of composite fiber pick-up unit, and structure is more simple, the gained data are also comparatively accurate, but cost comparatively speaking can be higher;
3. module of the present utility model and apparatus structure compactness, extensibility is strong, has wide range of applications, and is fit to promote the use of.
Other advantages of the present utility model, target and feature will be set forth to a certain extent in the following description, and to a certain extent, based on being conspicuous to those skilled in the art, perhaps can from practice of the present utility model, obtain instruction to investigating hereinafter.Target of the present utility model and other advantages can realize and obtain by following instructions and claims.
Description of drawings
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with accompanying drawing the utility model is described in further detail, wherein:
Fig. 1 is the structural representation of composite fiber detection module embodiment one;
Fig. 2 be Fig. 1 along A-A to diagrammatic cross-section;
Fig. 3 is the schematic perspective view of embodiment one;
Distortion synoptic diagram when Fig. 4 is sheared for composite fiber detection module;
Fig. 5 is for forming the synoptic diagram of little curved state between the cover tube coupling;
Fig. 6 is a composite fiber pick-up unit connection diagram of the present utility model;
Fig. 7 is the schematic perspective view of composite fiber detection module embodiment two.
Embodiment
Hereinafter with reference to accompanying drawing, preferred embodiment of the present utility model is described in detail.Should be appreciated that preferred embodiment only for the utility model is described, rather than in order to limit protection domain of the present utility model.
Embodiment one
As shown in Figure 1 to Figure 3, the composite fiber detection module of present embodiment comprises the base material 18 with stressed loading end, and the stressed loading end of base material 18 is provided with along same direction optical fiber structure I1 arranged side by side up and down, optical fiber structure II2 and optical fiber structure III3;
Optical fiber structure I1 is a tubular structure, comprise optical fiber I11 and steel pipe 12, the part that optical fiber I11 is positioned on the stressed loading end is protected by the cover steel pipe 12 of packing into, optical fiber I11 is provided with bowknot structure 40, and as shown in Figure 1, this bowknot structure 40 is that optical fiber I is passed baffle plate 41 back at square one-tenth thereafter, be subjected to external force at optical fiber I and play extension elongation effect as the time spent, in practice, this bowknot structure can be separately positioned on position outwardly, steel pipe 12 two ends for more than 1; Optical fiber structure II2 comprises the optical fiber II21 that is arranged on the stressed loading end, and adopts the structure that optical fiber II is inserted in soft sleeve pipe; Optical fiber structure III3 adopts embedded strain structure, comprise optical fiber III31 and strain mounted substrate I32, optical fiber III31 be two and with the mode that is parallel to each other embed respectively be installed on strain mounted substrate I32 on, lower surface, the mode that the lower surface of strain mounted substrate I32 contacts with face is arranged on the stressed loading end and with stressed loading end and is adjacent to, optical fiber III31 and optical fiber I11, optical fiber II21 keeping parallelism, in the present embodiment, optical fiber structure III3 also comprises strain mounted substrate II33, on the strain mounted substrate II33, be respectively arranged with two optical fiber IV34 that are parallel to each other on the lower surface, strain mounted substrate II33 is arranged on the strain mounted substrate I32, on the strain mounted substrate II33, lower surface and strain mounted substrate I32's is following, lower surface keeps orthogonal vertical, and optical fiber IV34 and optical fiber III31 are parallel to each other.For guaranteeing measurement effect, optical fiber III31, optical fiber IV34 should be and collapse the surface that tight back embeds the strain mounted substrate.
In the present embodiment; base material 1 is to be made by the material with certain plasticity and rigidity; distortion to a certain extent can take place after stressed; base material 1 is provided with coupling arrangement, and (concrete mode can adopt snapping, riveted joint or welding etc.; adopt the combination of discount 5 and buttonhole 6 in the present embodiment); can constitute spatial structure with single or a plurality of stressed loading ends or extend along same direction plane by coupling arrangement between a plurality of composite fiber detection modules, base material 1 be provided with and be used to locate or protects the groove of optical fiber structure and the cover plate of groove.
Wherein optical fiber structure I has adopted the design of outer steel pipe, at independent body optical fiber in the excessive disadvantage that fractures easily of displacement, the optical fiber of this structure is owing to be subjected to the protection of steel pipe, the distance that the crack produces can make steel pipe that thereby slip drive optical fiber takes place in device and move together, bowknot is shunk, thereby produce the variation of correlation parameter, be very suitable for wide range and shear force measurement; And optical fiber structure II is suitable for initial high-acruracy survey, can adopt soft sleeve pipe that optical fiber II is produced the certain protection effect, and also sleeve pipe directly is not provided with, and optical fiber structure II ruptures when shearing force is excessive easily; And optical fiber structure III is by the strain mounted substrate I of employing orthogonal vertical and the structure of strain mounted substrate II, and the pros and cons of strain mounted substrate I all embeds optical fiber III, strain mounted substrate I can be with the stressed bending of base material, optical fiber is stretched (stress surface produces and stretches) in bending and compression (simultaneously is stretched when bending, reverse side will be compressed), thereby generation scattering loss, because the loss (Brillouin shift) that stretches and compress has positive and negative relation, by loss (Brillouin shift) but whether produce perception whether with this direction (by just, negative sign can be judged positive negative sense) and produce crooked, thereby force measurement on the realization horizontal direction, in like manner, then can judge the stressed of vertical direction with the strain mounted substrate II of strain mounted substrate I orthogonal vertical, try to achieve the direction of making a concerted effort thereby then can set up coordinate system according to the size of both direction.Optical fiber structure III can also realize the measurement of stress intensity in theory, and the distortion situation when composite fiber detection module is sheared as shown in Figure 4.
It is to be noted; both can be as shown in Figure 3 on the optical fiber II; the soft sleeve pipe 22 that is used to protect optical fiber of the whole radical of suit; also can adopt the mode that is set with the identical cover tube coupling 23 of a plurality of structures along the embedment length of optical fiber II successively; the length of cover tube coupling 23 is greater than 1mm and less than 15mm; inside and outside footpath determines according to the diameter and the rigidity of bare fibre that mainly external diameter is 0.5～2mm usually, and internal diameter is 0.3～1.6mm.Under external force, described optical fiber II forms zigzag structures by cover tube coupling 23, and its sensor mechanism is little curved principle, when the cover tube coupling is buried injustice naturally underground or is out of shape when inconsistent, just forms the little of optical fiber between cover tube coupling and the cover tube coupling and bends, as shown in Figure 5.Therefore, when being subjected to the further distortion of external force generation, optical fiber is with the variation of this curved slightly point 24 of perception, when large deformation appears in residing matrix material, matrix material contacts with sleeve pipe and forms strong bond, because cover tube coupling 23 has limited the distortion of optical fiber II, optical fiber II forms little curved point in the macroscopic deformation bending, and collapsing with the rock stratum drops out existing loss step reflected signal.For guaranteeing little curved effect; the length of cover tube coupling can not be oversize; this is because the cover tube coupling is short more; the microbending loss of optical fiber is obvious more, and is high more for the sensitivity of OTDR instrument or the detection of BOTDR instrument, but sleeve pipe is too short; can influence the protection effect again; therefore, through repeatedly test, the length of the cover tube coupling 23 of present embodiment is selected for use and is 8mm.
The effect that optical fiber II adopts cover tube coupling 23 to form said structure is:
1. in installation process, play protection optical fiber, make this kind structure and help in the optical fiber slippage, being unlikely to make optical fiber to stretch tight too tight and rupturing;
2. because many rock soil mass itself are softer, be not suitable for irritating the too high mortar of intensity, therefore may carry out the landfill test hole with the thing of sand and so on, all be softer object this moment around optical fiber II, therefore, band cover tube coupling can be strengthened the little curved degree between the two cover tube couplings, just not can not produce apparent in view microbending loss and do not add the cover tube coupling.
As described in Figure 6, adopt the composite fiber pick-up unit of the composite fiber detection module of present embodiment, comprise multidiameter option switch 9 and detect main frame 8, detect main frame and adopt the Brillouin light domain reflectometer, detection main frame 8 links and receives fiber-optic signal by multidiameter option switch 9 and three road optical fiber and handles.
This device in use, finish the collection of relevant information by three groups of optical fiber structures, the CPU of Brillouin light domain reflectometer is responsible for the information that collects is handled, analyzed and calculates, and be used for control instrument state, input data, measure etc., the information that collects is after the CPU overall treatment, obtain the data such as deformation, displacement of subject, it is integrated to realize that multiparameter information acquisition, data intelligence processing and result show.
Certainly, detect main frame and also can adopt light power meter to connect optical fiber I and optical fiber II, determine related data by measuring loss, concrete framework is set up according to mature structure.
Embodiment two
As shown in Figure 7, embodiment two is with the difference of embodiment one, do not adopt strain mounted substrate II, but being adopted, optical fiber III31 carves the Fibre Optical Sensor that is provided with grating, its principle is to carve at inside of optical fibre to establish Bragg grating, use the optical fiber tuner to launch the light of certain frequency range then, understand the light that reflects certain wavelength after running into grating, like this, when external force changes, the distance of each grating can change, and the optical wavelength that reflects so also can change, and can realize direction determining to external stress by the data of gathering.
Adopt the composite fiber pick-up unit of the composite fiber detection module of present embodiment, comprise the optical fiber tuner that is used for transmitting illuminant and write down the spectrometer that light wave changes, it connects simple, technology maturation, compare with embodiment one, the data variation that embodiment two records is more suitable for analyzing and judges, but its cost is higher.
Application example 1
1. reserve in the appropriate location of subject inside and bury duct or boring afterwards underground, the composite fiber module of preprepared plane or spatial structure is embedded in the duct, can be when burying underground according to the duct degree of depth with detect needs the orientation coalignment is set;
2. with the moderate grouting material of intensity the composite optical fiber device and the measured body of periphery are combined closely, to pass out relevant load and strain information, when subject produces distortion or motion, the distortion and the motion size of the definite measured bodies such as microbending loss, bending loss and detrusion that produce according to optical fiber;
3. the various parameters that will collect, information, data transfer by detecting the analyzing and processing of main frame, are made corresponding judgement according to preset program to detecting main frame, adopt to realize early warning and countermeasure.
Application example 2
Different with application example 1 is, application example 2 is the outsides that the composite fiber module of ready plane or spatial structure are fixed on subject, and the obtain manner of remaining testing process and principle, parameter is identical with application example 1.
Explanation is at last, above embodiment is only unrestricted in order to the explanation the technical solution of the utility model, although the utility model is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement the technical solution of the utility model, and not breaking away from the aim and the scope of the technical program, it all should be encompassed in the middle of the claim scope of the present utility model.
Claims (10)
1. composite fiber detection module, it is characterized in that: comprise the base material with stressed loading end, the stressed loading end of described base material is provided with along same direction optical fiber structure I arranged side by side up and down, optical fiber structure II and optical fiber structure III;
Described optical fiber structure I is a tubular structure, comprise optical fiber I and steel pipe, described optical fiber I is positioned at part on the stressed loading end by being inserted in steel duct protection, and described optical fiber I is provided with the bowknot structure that is used to extend elongation, and described optical fiber structure I is used for the large range measuring of shearing force; Described optical fiber structure II is the independent body optical fiber structure, comprises the optical fiber II that is arranged on the stressed loading end, and described optical fiber structure II is used for the initial high-acruracy survey and the position probing of shearing force; Described optical fiber structure III adopts embedded strain structure, comprise optical fiber III and strain mounted substrate I, described optical fiber III is two and embeds the upper and lower surface that is installed on strain mounted substrate I in the mode that is parallel to each other respectively, the lower surface of described strain mounted substrate I is horizontally set on the stressed loading end with the face way of contact, described optical fiber III and optical fiber I, optical fiber II keeping parallelism, described optical fiber structure III are used for the orientation of shearing force and judge.
2. composite fiber detection module according to claim 1, it is characterized in that: described optical fiber structure III also comprises strain mounted substrate II, be respectively arranged with two optical fiber IV that are parallel to each other on the upper and lower surface of described strain mounted substrate II, described strain mounted substrate II is arranged on strain mounted substrate I last and the upper and lower surface of strain mounted substrate II and the upper and lower surface maintenance orthogonal vertical of strain mounted substrate I, and described optical fiber IV and optical fiber III are parallel to each other.
3. composite fiber detection module according to claim 1 and 2 is characterized in that: described optical fiber III is a single fiber.
4. composite fiber detection module according to claim 1 is characterized in that: described optical fiber III is for carving the optical fiber that is provided with grating.
5. composite fiber detection module according to claim 1 and 2 is characterized in that: the soft sleeve pipe that is used to protect optical fiber that is set with whole radical on the described optical fiber II.
6. composite fiber detection module according to claim 1 and 2, it is characterized in that: the embedment length of described optical fiber II upper edge optical fiber II is set with the identical cover tube coupling of a plurality of structures successively, the length of described cover tube coupling is greater than 1mm and less than 15mm, external diameter is 0.5～2mm, internal diameter is 0.3～1.6mm, under external force, described optical fiber II forms zigzag structure by the cover tube coupling.
7. composite fiber detection module according to claim 3, it is characterized in that: described base material is provided with coupling arrangement, constitutes spatial structure with single or a plurality of stressed loading ends by coupling arrangement between described a plurality of composite fiber detection modules or extends along same direction plane.
8. composite fiber detection module according to claim 4, it is characterized in that: described base material is provided with coupling arrangement, constitutes spatial structure with single or a plurality of stressed loading ends by coupling arrangement between described a plurality of composite fiber detection modules or extends along same direction plane.
9. composite fiber pick-up unit, it is characterized in that: comprise composite fiber detection module as claimed in claim 3, also comprise multidiameter option switch and detect main frame, described detection main frame links and receives fiber-optic signal by multidiameter option switch and three road optical fiber and handles, and described detection main frame is the Brillouin light domain reflectometer.
10. composite fiber pick-up unit, it is characterized in that: comprise composite fiber detection module as claimed in claim 4, also comprise the detection main frame that receives fiber-optic signal and handle, described detection main frame comprises optical time domain reflectometer and optical fiber tuner, spectrometer, wherein, optical time domain reflectometer is used to connect optical fiber I and optical fiber II, and described optical fiber tuner is used to be connected optical fiber III with spectrometer.
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| CN2010201109719U CN201697613U (en) | 2010-02-09 | 2010-02-09 | Composite optical fiber detection module and device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105910992A (en) * | 2016-05-06 | 2016-08-31 | 河海大学 | Concrete damage dynamic diagnosis system and method based on distributed sensing optical fiber |
| CN106370121A (en) * | 2016-08-15 | 2017-02-01 | 沈阳建筑大学 | Clamping type fiber grating matrix strain correction method |
| CN108303025A (en) * | 2018-01-22 | 2018-07-20 | 中国地质大学（武汉） | A kind of device measuring slope soil displacement |
-
2010
- 2010-02-09 CN CN2010201109719U patent/CN201697613U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105910992A (en) * | 2016-05-06 | 2016-08-31 | 河海大学 | Concrete damage dynamic diagnosis system and method based on distributed sensing optical fiber |
| CN105910992B (en) * | 2016-05-06 | 2017-05-03 | 河海大学 | Concrete damage dynamic diagnosis system based on distributed sensing optical fiber |
| CN106370121A (en) * | 2016-08-15 | 2017-02-01 | 沈阳建筑大学 | Clamping type fiber grating matrix strain correction method |
| CN106370121B (en) * | 2016-08-15 | 2019-03-22 | 沈阳建筑大学 | The matrix strain correction method of clipping fiber grating |
| CN108303025A (en) * | 2018-01-22 | 2018-07-20 | 中国地质大学（武汉） | A kind of device measuring slope soil displacement |
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Granted publication date: 20110105 Effective date of abandoning: 20110727 |