CN1635335A - Optical fiber inclinometer - Google Patents
Optical fiber inclinometer Download PDFInfo
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- CN1635335A CN1635335A CN 200310110352 CN200310110352A CN1635335A CN 1635335 A CN1635335 A CN 1635335A CN 200310110352 CN200310110352 CN 200310110352 CN 200310110352 A CN200310110352 A CN 200310110352A CN 1635335 A CN1635335 A CN 1635335A
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- optical fiber
- inclinator
- rotation
- pedestal
- bragg grating
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Abstract
This invention relates to a fiber deflection gauge, which comprises one base socket, one connection plate with one end connected to the socket, one rotation socket connected to the connection plate by a pair of rotation structure, at least two fiber Brag grating elements separately set to the surface side of the connection plate. When the rotation socket rotates relative to the connection plate, one fiber Brag grating element generates axis-stretching deformation and the other element generates the axis compression deformation. We can get the rotation angle of the rotation socket to the connection plate through separately measuring the floating displacement of Brag wavelength of the pair of the Brag grating elements.
Description
[technical field]
The invention relates to a kind of optical fiber inclinator that is used for the crooked or deviation angle of measurement structure thing.
[background technology]
Optical fiber is made of a fibre core (core) and a clad (cladding) that coats this fibre core.The refractive index of this fibre core is higher than the refractive index of this clad, total reflection takes place when being sent to optically thinner medium (low-index regions) owing to light by optically denser medium (high-index regions), thereby light is able to constantly propagate in optically denser medium.
Utilized argon laser to produce fiber grating (grating) first in mixing the fibre core of germanium by K.O.Hill in 1987, except widespread use in Fiber Optical Communication System, it also has great usage space in the sensing field.Meltz in 1989 etc. are with the photosensitive optical fiber photograph that exposes to the sun under the high-energy ultraviolet laser, thereby the bond state that changes its interior molecules makes refractive index become big, and its refractive index along fiber axis to presenting periodic variation.This kind optical fiber is called Fiber Bragg Grating FBG (Fiber Bragg Grating again; FBG) assembly.
Fig. 1 is the schematic perspective view of the optical fiber 10 of a tool Fiber Bragg Grating FBG.This optical fiber 10 comprises the fibre core 13 that a total length is L, and it is coated by clad 12 and protective seam 11 successively.There is an incident light 14 to enter, and penetrates out and form one from right-hand member and penetrate light 15 from fibre core 13 left ends.Because refractive index changes to presenting periodic rule along fiber axis, can't penetrate so have the incident light 14 of specific wavelength, and can reflect back into former incident end (left end).
Fig. 2 (a) is Fig. 1 incident light and catoptrical Wavelength distribution figure.This incident light 14 comprises the light of certain wavelength coverage, and reflected light 16 is mainly the light of specific wavelength λ b1 in this wavelength coverage, and the wavelength coverage that therefore penetrates light that light 15 comprises has just been lacked the light of wavelength X b1.This wavelength X b1 is called bragg wavelength (Bragg wavelength), shown in Fig. 2 (b).
When optical fiber 10 is subjected to temperature or external force and elongation Δ L on producing axially, its bragg wavelength can move to λ b2 by λ b1, as shown in Figure 3.Perhaps produce decrement, make bragg wavelength to move to λ b3 by λ b1.So can obtain following formula:
Wherein Δ T representation temperature is poor; Kt is a temperature-sensitivity coefficient; Ke is the strain sensitive coefficient; ε is the axial strain value, promptly equals Δ L divided by L.
If axially strain value is 10 under fixed temperature
-6, then bragg wavelength drift value Δ λ=λ b2-λ b1 is about 0.00115～0.0012 nanometer (nm).Because of the Fiber Bragg Grating FBG assembly can be used as the superprecision meter of physical quantitys such as measuring strain, temperature, so be widely used at present in the monitoring of the stress of civil engineering structure and deformation.Traditional electric resistance wire strain gauge need be drawn signal wire, the easy electromagnetic wave interference of indivedual measurement points and can't be suitable for rugged surroundings such as damp and hot, compare with it, advantages such as this Fiber Bragg Grating FBG assembly has that energy dissipation is low, transmission speed is fast, transmission frequency bandwidth and the abominable factor of anti-environment, the strain that the optical fiber that especially can utilize single line to connect is measured multiple spot simultaneously, therefore can replace the various application of known resistance formula strainometer, for example: inclinator or inclinator.
[summary of the invention]
The objective of the invention is to be to provide a kind of optical fiber inclinator of using the Fiber Bragg Grating FBG assembly, can measure the structure inclined degree, and the situation of monitoring angle change.
Another object of the present invention provides a kind of optical fiber inclinator simple in structure, becomes small and exquisite closely knit optical fiber inclinator with simple and a spot of combination of components, and is cheap for manufacturing cost, has very much competitive power on the price.
In order to achieve the above object, the invention provides a kind of optical fiber inclinator, it is characterized in that: it comprises:
One pedestal;
A plate, the one end is fixed in this pedestal;
One rotates the end seat, and with a rotation structure is connected between this web joint;
At least two Fiber Bragg Grating FBG assemblies, it is located at apparent surface's side of this web joint respectively, and the two ends of each this Fiber Bragg Grating FBG assembly are individually fixed in this pedestal and this rotation end seat.
Described optical fiber inclinator, it is characterized in that: this rotation comprises that to structure a right cylinder and that is fixed in this web joint end is located at the grip part of this rotation end seat, this grip part holds this right cylinder just, and with this right cylinder serve as that axle forms and is rotatably assorted with the direction in its cylinder axle center.
Described optical fiber inclinator is characterized in that: this rotation end seat comprises a V-shaped groove in addition, be located at this web joint surface and and this grip part join, and this V-shaped groove limits the angle that this right cylinder and this web joint rotate.
Described optical fiber inclinator is characterized in that: also comprise at least four optic fibre extension portions, engage with this Fiber Bragg Grating FBG assembly respectively, and extend to the outside of this pedestal and this rotation end seat.
Described optical fiber inclinator is characterized in that: the end of this optic fibre extension portion is provided with a connector.
Described optical fiber inclinator is characterized in that: also comprise two rigidity tubing that are socketed on the opposite side on this pedestal and this rotation end seat respectively.
Described optical fiber inclinator is characterized in that: the outer wall of this rigidity tubing is provided with several pilot pins.
The present invention also provides a kind of optical fiber inclinator, and it is characterized in that: it comprises:
One pedestal;
One joint pin, the one end is fixed in this pedestal;
One rotates the end seat, and with a sphere structure is connected between this joint pin;
At least three Fiber Bragg Grating FBG assemblies are located at respectively on the circumference of outer concentric circle of this joint pin, and the two ends of each this Fiber Bragg Grating FBG assembly are individually fixed in this pedestal and this rotations end.
Described optical fiber inclinator is characterized in that: this sphere comprises that to structure one is fixed in the spheroid of this joint pin end, and one is located at the grip part that seat is held in this rotation; This grip part holds this spheroid just, and forms rotation movingly with this spheroid along the direction perpendicular to this joint pin surrounded surface.
Described optical fiber inclinator is characterized in that: also comprise at least six optic fibre extension portions and engage with this Fiber Bragg Grating FBG assembly respectively, and extend to the outside of this pedestal and this rotation end seat.
Described optical fiber inclinator is characterized in that: the end of this optic fibre extension portion is provided with a connector.
Described optical fiber inclinator is characterized in that: also comprise two rigidity tubing that are socketed on the opposite side on this pedestal and this rotation end seat respectively.
Described optical fiber inclinator is characterized in that: the outer wall of this rigidity tubing is provided with several pilot pins.
Described optical fiber inclinator is characterized in that: this Fiber Bragg Grating FBG assembly is to be located on the some position of the round Equal round girth of this joint pin outer concentric.
In sum, a kind of optical fiber inclinator that the present invention discloses, it comprises a pair of Fiber Bragg Grating FBG assembly, a pedestal, a plate and a rotation end seat.One end of this web joint is fixed in this pedestal, and the other end is connected to (turning pair) structure with a rotation with this rotation end seat.In addition, the two ends of each Fiber Bragg Grating FBG assembly are to be individually fixed in this pedestal and the rotation end seat, and this two assembly is located at apparent surface's side of this web joint respectively.When between this rotation end seat and this web joint relative rotary motion being arranged, wherein a Fiber Bragg Grating FBG assembly produces axial tension deformation, and another assembly then produces axial compression deformation.By measuring and calculate the bragg wavelength drift value of this a pair of Fiber Bragg Grating FBG assembly respectively, just can obtain the anglec of rotation of this rotation end seat with respect to this web joint.
The present invention also provides a kind of optical fiber inclinator, and it comprises at least three Fiber Bragg Grating FBG assemblies, a pedestal, a joint pin and a rotation end seat.This joint pin one end is fixed in this pedestal, and the other end is connected to (spherical pair or ball joint) structure with a sphere with this rotation end seat.In addition, the two ends of each Fiber Bragg Grating FBG assembly are individually fixed in this pedestal and rotate in the end seat, and this assembly is located at respectively on the sub-multiple angle position of peripheral circumferential of this joint pin.When between this rotation end seat and this web joint relative rotary motion being arranged, wherein this Fiber Bragg Grating FBG assembly of some position produces axial tension deformation, and this assembly of other positions then produces axial compression deformation.Measure and calculate the bragg wavelength side-play amount of this Fiber Bragg Grating FBG assembly respectively, the difference of calculating this two side-play amount just can obtain the two-dimentional anglec of rotation of this rotation end seat with respect to this web joint.Since be that difference with the variable quantity of two Fiber Bragg Grating FBG assemblies serves as to calculate the basis, the effect of Fiber Bragg Grating FBG assembly to temperature itself can be offseted, so go for outdoor temperature.
[description of drawings]
Fig. 1 one has the schematic perspective view of the optical fiber of Fiber Bragg Grating FBG;
Fig. 2 (a) is Fig. 1 incident light and catoptrical Wavelength distribution figure;
Fig. 2 (b) is that Fig. 1 penetrates the light wavelength distribution plan;
Fig. 3 is the synoptic diagram of bragg wavelength drift;
Fig. 4 is the schematic perspective view of optical fiber inclinator of the present invention;
Fig. 5 is the enlarged diagram of rotation to structure;
Fig. 6 is optical fiber inclinator of the present invention is measured the angle of inclination in soil holes a synoptic diagram;
Fig. 7 is the schematic perspective view of another optical fiber inclinator of the present invention;
Fig. 8 is the schematic perspective view of another optical fiber inclinator of the present invention.
Element numbers explanation in the accompanying drawing:
| 10 | 11 |
| 12 | 13 |
| 14 | 15,15 ' |
| 16 reflected | |
| 40,70,80 | 41,71,81 |
| 42 | 421 |
| 43 rotate the end seat | 431,731,831 grip parts |
| 432 V- | 44,74,84 Fiber Bragg Grating FBG |
| 45,75,85 optic | 46,76,86 connectors |
| 47 rotations are to structure | |
| 61 rigidity tubing | 62 pilot pins |
| 63 | |
| 72,82 joint pins | 721,821 |
| 73,83 rotate the | 77,87 spheres are to structure |
[embodiment]
Fig. 4 is the schematic perspective view of optical fiber inclinator 40 of the present invention.This optical fiber inclinator 40 comprises a pair of Fiber Bragg Grating FBG assembly 44, a pedestal 41, a plate 42 and a rotation end seat 43.One end of this web joint 42 is fixed in pedestal 41, and the other end holds seat 43 with a rotation structure 47 to be connected with rotation.Rotate and hold seat 43 and 42 relative rotary motion that keep one degree of freedom of web joint, that is upward produce the relative angle displacement along the direction (X-axis) of vertical web joint 42 sides.
In addition, the two ends of each Fiber Bragg Grating FBG assembly 44 are to be individually fixed in pedestal 41 and the rotation end seat 43, and this Fiber Bragg Grating FBG assembly 44 is located at the different surfaces side of web joint 42 respectively.Optic fibre extension portion 45 extends from the two ends of Fiber Bragg Grating FBG assembly 44, be exposed to pedestal 41 respectively and rotate the surface of end seat 43, and each end face has the continue connector 46 of purposes of series connection.
For making Fiber Bragg Grating FBG assembly 44 when measuring the angle of inclination, still remain on tight state, therefore need just give suitable pre-tensile stress (pre-tensile-stress) when the two ends of fixed fiber Bragg grating assembly 44, the Fiber Bragg Grating FBG assembly 44 of a side is squeezed and relaxes to avoid wherein.Just when rotation held seat 43 and 42 of web joints that relative rotary motion is arranged, wherein a Fiber Bragg Grating FBG assembly 44 produced the axial tension deformation, and another relative component then can produce axial compression deformation.Measure and calculate the difference of the bragg wavelength offset λ of this a pair of Fiber Bragg Grating FBG assembly 44 respectively, just can obtain rotating end seat 43 the anglecs of rotation with respect to web joint 42.In addition, because this is the positions that are in symmetry to Fiber Bragg Grating FBG assembly 44, so the STRESS VARIATION that temperature variation produces can mutual balance.
Fig. 5 is the enlarged diagram of rotation to structure 47.This rotation comprises the right cylinder 421 of being located at web joint 42 end faces, V-shaped groove 432 and the grip part 431 of being located at rotation end seat 43 surfaces to structure 47.This grip part 431 just can hold the volume of right cylinder 421, and can rotate along the direction of vertical drawing for right cylinder 421 and web joint 42.The opening angle of V-shaped groove 432 will limit the maximal phase diagonal displacement θ max of web joint 42, and general maximal phase diagonal displacement θ max is approximately less than 2 degree.
The stability of monitoring inwall when optical fiber inclinator 40 of the present invention can further be applied to deep excavation such as tunnel, building and dam, or as the instrument of the long term monitoring of landslide, rubble flow and side slope formation displacement.Fig. 6 is that optical fiber inclinator 40 holes in soil and measures the synoptic diagram at angle of inclination in (borehole).In in Fig. 6, having a tipping tube 63 to be embedded in to punching, can slide to depths, the face of land along tipping tube 63 inwalls or guide groove for optical fiber inclinator 40 and dependency structure thereof.Respectively there is a rigidity tubing 61 sockets protection to live in a pedestal 41 and rotation end seat 43 opposite sides; and the connector 46 of adjacent fiber inclinator 40 can connect in rigidity tubing 61, therefore can measure the continuous variation of ground to the angle of inclination of depths, the end, ground simultaneously in conjunction with dozens of rigidity tubing 61 by dozens of optical fiber inclinator 40.Rigidity tubing 61 is provided with several pilot pins 62 (holding pin or guiding pin) or pulley in addition, since around pilot pin 62 be close to tipping tube 63 inwalls or guide groove and can guarantee still keeping parallelism of optical fiber inclinator 40 and this part tipping tube 63, yet, rotate end seat 43 and but can produce the angle of inclination that angle displacement-θ reacts tipping tube 63.
Fig. 7 is the schematic perspective view of another optical fiber inclinator 70 of the present invention.This optical fiber inclinator 70 comprises four Fiber Bragg Grating FBG assemblies 74, a pedestal 71, a joint pin 72 and a rotation end seat 73.One end of this joint pin 72 is fixed in pedestal 71, the other end with rotate end seat 73 and structure 77 be connected with a sphere.Rotate 72 relative rotary motion that keep two degree of freedom of end seat 73 and joint pin thus, that is along producing the relative angle displacement on X-axis and the Z-direction.
In addition, the two ends of each Fiber Bragg Grating FBG assembly 74 are to be individually fixed in pedestal 71 and the rotation end seat 73, and The Fiber Bragg Grating FBG assembly 74 is located at apparent surface's side of joint pin 72 respectively.Optic fibre extension portion 75 extends from Fiber Bragg Grating FBG assembly 74 two ends, be exposed to pedestal 71 respectively and rotate the surface of end seat 73, and each end face has the continue connector 76 of purposes of series connection.
For making Fiber Bragg Grating FBG assembly 74 when measuring the angle of inclination, still remain on tight state, therefore need just give suitable pre-tensile stress when the two ends of fixed fiber Bragg grating assembly 74, the Fiber Bragg Grating FBG assembly 74 of a side is squeezed and relaxes to avoid wherein.Just when rotation holds seat 73 and 72 of joint pins that relative rotary motion is arranged, some Fiber Bragg Grating FBG assemblies 74 will produce axial tension deformation, and other assemblies then can produce axial compression deformation.Measure and calculate the bragg wavelength drift value Δ λ of this Fiber Bragg Grating FBG assembly 74 respectively, just can obtain rotating end seat 73 the anglecs of rotation with respect to joint pin 72.
This sphere comprises the spheroid 721 of being located at joint pin 72 end faces to structure 77, and is located at the grip part 731 of rotating end seat 73.This grip part 731 just can hold the volume of spheroid 721, and can rotate along the direction of Z axle and X-axis for spheroid 721 and joint pin 72.Optical fiber inclinator 40 of the present invention or 70 and traditional electrical minor inclination inserting tube (Inclinometer Probe; IP) compared many advantages, for example: can place for a long time monitoring tilt variation in the soil middle sleeve, sensitivity high, be not subjected to electromagnetic interference (EMI), also can use, need not the power supply supply at water in the building site, connection is convenient again fast, simultaneously multiple spot and remote measurement, the sense data acquisition is easy, simple to operate and can write down measurement result automatically.
Fig. 8 is the schematic perspective view of another optical fiber inclinator 80 of the present invention.This optical fiber inclinator 80 comprises three Fiber Bragg Grating FBG assemblies 84, a pedestal 81, a joint pin 82 and a rotation end seat 83.Compare with Fig. 7, present embodiment just can obtain rotating the anglec of rotation of end seat 83 on two-dimensional directional with the Fiber Bragg Grating FBG assembly 84 of minimum number, and therefore the cost competitiveness than advantage is arranged.One end of this joint pin 82 is fixed in pedestal 81, the other end with rotate end seat 83 and structure 87 be connected with a sphere.Make thus and rotate end seat 83 and 82 relative rotary motion that keep two degree of freedom of joint pin, that is along producing the relative angle displacement on X-axis and the Z-direction.
In addition, the two ends of each Fiber Bragg Grating FBG assembly 84 are to be individually fixed in pedestal 81 and the rotation end seat 83, and this Fiber Bragg Grating FBG assembly 84 is located at respectively on the circumference of outer concentric circle of joint pin 82, certainly with on the some position that is fixed on sub-multiple angle position or Equal round girth for more suitable, promptly be that Fiber Bragg Grating FBG assembly 84 is located on the sub-multiple angle bit position among the figure.Optic fibre extension portion 85 extends from Fiber Bragg Grating FBG assembly 84 two ends, be exposed to pedestal 81 respectively and rotate the surface of end seat 83, and each end face has the continue connector 86 of purposes of series connection.For making Fiber Bragg Grating FBG assembly 84 when measuring the angle of inclination, still remain on tight state, therefore need just give suitable pre-tensile stress when the two ends of fixed fiber Bragg grating assembly 84, the Fiber Bragg Grating FBG assembly 84 of a side is squeezed and relaxes to avoid wherein.Just when rotation holds seat 83 and 82 of joint pins that relative rotary motion is arranged, the Fiber Bragg Grating FBG assembly 84 of some positions, angle will produce axial tension deformation, and other angle hyte parts then can produce axial compression deformation.Measure and calculate the bragg wavelength drift value Δ λ of this Fiber Bragg Grating FBG assembly 84 respectively, just can obtain rotating end seat 83 the anglecs of rotation with respect to joint pin 82.
This rotation comprises the spheroid 821 of being located at joint pin 82 end faces to structure 87, and is located at the grip part 831 of rotating end seat 83.This grip part 831 just can hold the volume of spheroid 821, and can rotate along the direction of Z axle and X-axis for spheroid 821 and joint pin 82.
Technology contents of the present invention and technical characterstic disclose as above, yet those of ordinary skill in the art still may be based on teaching of the present invention and announcements and done all replacement and modifications that does not deviate from spirit of the present invention.Therefore, protection scope of the present invention should be not limited to the content that embodiment discloses, and should comprise various do not deviate from replacement of the present invention and modifications.
Claims (14)
1. optical fiber inclinator, it is characterized in that: it comprises:
One pedestal;
A plate, the one end is fixed in this pedestal;
One rotates the end seat, and with a rotation structure is connected between this web joint;
At least two Fiber Bragg Grating FBG assemblies, it is located at apparent surface's side of this web joint respectively, and the two ends of each this Fiber Bragg Grating FBG assembly are individually fixed in this pedestal and this rotation end seat.
2. optical fiber inclinator as claimed in claim 1, it is characterized in that: this rotation comprises that to structure a right cylinder and that is fixed in this web joint end is located at the grip part of this rotation end seat, this grip part holds this right cylinder just, and with this right cylinder serve as that axle forms and is rotatably assorted with the direction in its cylinder axle center.
3. optical fiber inclinator as claimed in claim 2 is characterized in that: this rotation end seat comprises a V-shaped groove in addition, be located at this web joint surface and and this grip part join, and this V-shaped groove limits the angle that this right cylinder and this web joint rotate.
4. optical fiber inclinator as claimed in claim 1 is characterized in that: also comprise at least four optic fibre extension portions, engage with this Fiber Bragg Grating FBG assembly respectively, and extend to the outside of this pedestal and this rotation end seat.
5. optical fiber inclinator as claimed in claim 4 is characterized in that: the end of this optic fibre extension portion is provided with a connector.
6. optical fiber inclinator as claimed in claim 1 is characterized in that: also comprise two rigidity tubing that are socketed on the opposite side on this pedestal and this rotation end seat respectively.
7. optical fiber inclinator as claimed in claim 6 is characterized in that: the outer wall of this rigidity tubing is provided with several pilot pins.
8. optical fiber inclinator, it is characterized in that: it comprises:
One pedestal;
One joint pin, the one end is fixed in this pedestal;
One rotates the end seat, and with a sphere structure is connected between this joint pin;
At least three Fiber Bragg Grating FBG assemblies are located at respectively on the circumference of outer concentric circle of this joint pin, and the two ends of each this Fiber Bragg Grating FBG assembly are individually fixed in this pedestal and this rotations end.
9. optical fiber inclinator as claimed in claim 8 is characterized in that: this sphere comprises that to structure one is fixed in the spheroid of this joint pin end, and one is located at the grip part that seat is held in this rotation; This grip part holds this spheroid just, and forms rotation movingly with this spheroid along the direction perpendicular to this joint pin surrounded surface.
10. optical fiber inclinator as claimed in claim 9 is characterized in that: also comprise at least six optic fibre extension portions and engage with this Fiber Bragg Grating FBG assembly respectively, and extend to the outside of this pedestal and this rotation end seat.
11. optical fiber inclinator as claimed in claim 10 is characterized in that: the end of this optic fibre extension portion is provided with a connector.
12. optical fiber inclinator as claimed in claim 8 is characterized in that: also comprise two rigidity tubing that are socketed on the opposite side on this pedestal and this rotation end seat respectively.
13. optical fiber inclinator as claimed in claim 12 is characterized in that: the outer wall of this rigidity tubing is provided with several pilot pins.
14. optical fiber inclinator as claimed in claim 8 is characterized in that: this Fiber Bragg Grating FBG assembly is to be located on the some position of the round Equal round girth of this joint pin outer concentric.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101103524A CN100559116C (en) | 2003-12-29 | 2003-12-29 | The optical fiber inclinator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101103524A CN100559116C (en) | 2003-12-29 | 2003-12-29 | The optical fiber inclinator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1635335A true CN1635335A (en) | 2005-07-06 |
| CN100559116C CN100559116C (en) | 2009-11-11 |
Family
ID=34843205
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2003101103524A Expired - Fee Related CN100559116C (en) | 2003-12-29 | 2003-12-29 | The optical fiber inclinator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100559116C (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103344782A (en) * | 2013-06-17 | 2013-10-09 | 华北电力大学 | Wind direction sensing system of optical fiber Bragg grating and wind direction calculating method |
| CN104567646A (en) * | 2015-01-18 | 2015-04-29 | 蒋梦 | Connecting rod type displacement monitor |
| CN104677337A (en) * | 2015-02-09 | 2015-06-03 | 吉林大学 | High-precision inclination angle sensing device based on fiber Bragg grating |
| CN105783777A (en) * | 2016-04-27 | 2016-07-20 | 武汉理工大学 | Fiber grating sensing-based railway track line shape on-line monitoring device and method |
| CN108507598A (en) * | 2017-02-28 | 2018-09-07 | 香港理工大学 | A kind of fiber bragg grating angular transducer |
| CN108801216A (en) * | 2018-05-09 | 2018-11-13 | 中国矿业大学 | A kind of fiber bragg grating inclinator |
| CN110672067A (en) * | 2019-11-11 | 2020-01-10 | 山东省科学院激光研究所 | Fiber grating tilt angle sensor |
| CN110823122A (en) * | 2018-08-08 | 2020-02-21 | 武汉理工大学 | Bending curvature measuring device and method based on fiber bragg grating and elastic body |
-
2003
- 2003-12-29 CN CNB2003101103524A patent/CN100559116C/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103344782A (en) * | 2013-06-17 | 2013-10-09 | 华北电力大学 | Wind direction sensing system of optical fiber Bragg grating and wind direction calculating method |
| CN103344782B (en) * | 2013-06-17 | 2015-04-15 | 华北电力大学 | Wind direction sensing system of optical fiber Bragg grating and wind direction calculating method |
| CN104567646A (en) * | 2015-01-18 | 2015-04-29 | 蒋梦 | Connecting rod type displacement monitor |
| CN104567646B (en) * | 2015-01-18 | 2015-12-02 | 蒋梦 | A kind of link-type displacement monitor |
| CN104677337A (en) * | 2015-02-09 | 2015-06-03 | 吉林大学 | High-precision inclination angle sensing device based on fiber Bragg grating |
| CN105783777A (en) * | 2016-04-27 | 2016-07-20 | 武汉理工大学 | Fiber grating sensing-based railway track line shape on-line monitoring device and method |
| CN105783777B (en) * | 2016-04-27 | 2018-05-01 | 武汉理工大学 | The linear on-Line Monitor Device of railroad track and method based on optical fiber grating sensing |
| CN108507598A (en) * | 2017-02-28 | 2018-09-07 | 香港理工大学 | A kind of fiber bragg grating angular transducer |
| CN108801216A (en) * | 2018-05-09 | 2018-11-13 | 中国矿业大学 | A kind of fiber bragg grating inclinator |
| CN110823122A (en) * | 2018-08-08 | 2020-02-21 | 武汉理工大学 | Bending curvature measuring device and method based on fiber bragg grating and elastic body |
| CN110672067A (en) * | 2019-11-11 | 2020-01-10 | 山东省科学院激光研究所 | Fiber grating tilt angle sensor |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100559116C (en) | 2009-11-11 |
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