CN2599557Y - Bidirectional torsioning optical fibre sensor - Google Patents
Bidirectional torsioning optical fibre sensor Download PDFInfo
- Publication number
- CN2599557Y CN2599557Y CNU022912606U CN02291260U CN2599557Y CN 2599557 Y CN2599557 Y CN 2599557Y CN U022912606 U CNU022912606 U CN U022912606U CN 02291260 U CN02291260 U CN 02291260U CN 2599557 Y CN2599557 Y CN 2599557Y
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- optical fiber
- torsional
- optical
- torsion
- torsional beam
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Abstract
The utility mode relates to a two-way torsional optical-fiber sensor, pertaining to a novel design of sensor. The sensor comprises an optical fiber, a torsional beam, a fixed end, a thin metal wire, a light source, an optical power meter, an optical-fiber connector, etc. One end of the cylindrical torsional beam is fixed, and the other end is free; the edge of the thin metal wire is obliquely bonded at a location near the free end of the torsional beam, in an angle of Theta#-[1](0 degree less than Theta#-[1] less than 9 degree) (in axial direction) with the torsional beam; the edge of the optical fiber is in an angle of Theta#-[f](0 degree less than less than Theta#-[f] less than 9degree) (in axial direction) with the torsional beam and reversely wound with the metal wire by a constant pitch; both ends of the wound optical ring are bonded onto the surface of the torsional beam by agglomerant; the two ends of the optical fiber wound on the torsional beam are connected to the light source and detector respectively. When the free end of the torsional beam receives the torque action, the torsional beam generates torsional strain and causes slight bending of the proportion where the optical fiber wound on the torsional beam contacts the metal wire. When the value of optical power loss is measured, the torsional state (torsional angle, the strength and direction of torque or torsional stress) can be sensed in two directions (clockwise and anti-clockwise) very precisely.
Description
Technical field
The utility model is a kind of new design in the sensory field of optic fibre, particularly a kind of optical fiber bidirectional torsion sensor.Utilize optical fiber to carry out the bidirectional torsion sensing, can carry out high-precision sensing, belong to sensor technical field reversing parameter (torsional angle, moment of torsion or twisting stress).
Background technology
Optical fiber is a kind of novel light transmission and light sensing photonic device.Optical fiber is used for sensing technology, and promptly Fibre Optical Sensor is used for measurements such as strain (or stress), displacement, temperature, has light, flexible strong, convenient, sensitive, the many good characteristics such as precision is high, acid and alkali-resistance, anti-electromagnetic interference (EMI) of volume.Utilize modes such as bending loss of optical fiber, fibre optic interferometer, be equipped with in good time tracking control system, distributed, long distance that Fibre Optical Sensor can carry out, multiparameter sensing, aspect detections such as the structure of compound substance (as Smart), deformation, having important use is worth, be a kind of Dynamic Non-Destruction Measurement of novelty, now be widely used in every field such as industry, building industry, national defence and scientific research.But known Fibre Optical Sensor all is that result for retrieval shows also do not have a kind of employing to turn round girder construction at present, utilize optical fiber to reverse the optical fiber bidirectional torsion sensor of sensing at the detection of physical quantitys such as stress, pressure, displacement, temperature.
Summary of the invention
The purpose of this utility model is intended to design a kind of sensor that utilizes the optical fiber sensing to reverse.This sensor can be used for various occasions and the place that (torsional angle, moment of torsion or twisting stress) reversed in the needs measurement.Its technical scheme is: this novel optical fiber bidirectional torsion sensor, it comprises optical fiber, turns round beam, light source, fine wire, light power meter, optical fiber connector etc., it is characterized in that fine wire along with torsion beam axle to angled θ
lOblique sticking near turning round the beam free end; Optical fiber along with torsion beam axle to angled θ
fAnd constant pitch and tinsel oppositely twine, and the two ends of the fiber optic loop of winding stick on cementing agent and turn round on the beam surface; Being wrapped in the two ends of turning round the optical fiber on the beam is connected with light power meter with light source respectively.
At first select a homogeneous, symmetry, isotropy, can under the distorting stress effect, turn round beam, the one end is fixed other end freedom around the Elastic Cylindrical of axis rotation; Then, with a fine wire along with torsion beam axle to angled θ
l(0 °＜θ
l＜90 °) oblique sticking near turning round the beam free end; And then, with optical fiber along with torsion beam axle to angled θ
f(0 °＜θ
f＜90 °) and constant pitch and tinsel oppositely twine, the two ends of the fiber optic loop of winding stick on and turn round on the beam surface with cementing agent (as seccotine 102,504,502 etc.); At last, being wrapped in the two ends of turning round the optical fiber on the beam is connected with light power meter with light source respectively.
When turning round the beam free end and be subjected to torsional interaction, turn round twisting strain that beam produces and make and be wrapped in the optical fiber of turning round on the beam and produce little bending with the tinsel contact position.Along with the variation of moment of torsion, the micro curving rate peak value of pulse of optical fiber, width increase or reduce, and cause the microbending loss of optical fiber also different thus.In the use, as long as record the size of the optical power loss value of optical fiber, by following microbending loss with reverse (torsional angle, moment of torsion or twisting stress) relational expression, can be two-way the twisting states (size and Orientation of torsional angle, moment of torsion or twisting stress) of (clockwise with counterclockwise) high-precision sensing measured body.
δW＝K
MM (1)
δW＝K
(2)
δW＝K
FF (3)
K in the formula
M, K
, K
FIt is respectively the transduction factor of moment of torsion, torsional angle, twisting stress; M, , F are respectively sensing parameter torsional angle, moment of torsion, twisting stress; δ W=W-W
0Be that optical power loss is poor, W
0It is the initial light power attenuation.
Concern M=GI by moment of torsion
p/L and (1) formula, the expression formula that can obtain measuring the elastic body shear modulus G is:
L in the formula is a length of turning round beam, I
pIt is the polar moment of inertia of turning round beam.Turn round beam for cylindrical, massive, I
P=π D
4/ 32, D is an overall diameter of turning round beam; Turn round beam for cylinder type hollow, then I
p=π (D
4-d
4)/32, r is an interior diameter of turning round beam.
The beneficial effects of the utility model are that the sensing primitive only is a root multimode fiber, not only can reverse parameter (torsional angle, moment of torsion or twisting stress) by sensing, can also be used to measure elastomeric modulus of shearing, and is simple for structure, is easy to the system integration.
Description of drawings
Fig. 1 is bidirectional torsion optical fibre sensor structure figure
Fig. 2 turns round beam to reverse sectional view
The same thin wire θ of Fig. 3
lWith θ
fThe relative microbending loss δ I of three groups of representative values
GActual measurement correlation curve with torsional angle
Wherein, 1 multimode optical fiber 2. is turned round the tiltedly sticking angle of the beam 3. stiff ends 4. fine wires 5. tinsels tiltedly sticking angle of 6. optical fiber 7. optical fiber winding pitch 8. semiconductor lasers 9. light power meters 10. optical fiber connectors 11. moments of torsion 12, torsional angle 13, twisting stress 14, turns round beam length 15, is turned round the beam external radius
Embodiment
At first, the solid organic glass cylindrical rod of selected long L=100mm, diameter D=20mm is fixed the one end other end freedom; Then, with the thin wire of diameter d=0.35mm along beam axially with tiltedly sticking angle θ
l=45 ° of surfaces that stick on beam with seccotine 102; And then, No. 6 multimode graded-index fibers 1 are oppositely twined the tiltedly sticking angle θ of optical fiber with constant pitch s=10mm and thin wire
f=45 °, fiber optic loop is 20mm apart from the free end of beam, and its two ends stick on seccotine 102 and turn round on the beam surface; At last, being wrapped in the two ends of turning round the multimode optical fiber on the beam is connected with light power meter 9 with semiconductor laser 8 respectively.Wherein, the model of semiconductor laser is AV38124, and its centre wavelength is 1550nm, and can survey wavelength coverage is 800nm～1600nm; The model of light power meter is AV3495, and resolution is 0.01dB.Multimode optical fiber after the winding after testing, its initial light power attenuation W
0=17dB.
In specific embodiment subgraph 1, in the torsional angle scope of =-40 °～+ 40 °, the torsional angle of this sensor and the power attenuation of multimode optical fiber are almost relation, its torsional angle transduction factor K
=0.375dB/degree, the technical realization clockwise and counterclockwise bidirectional torsion sensing.Shown in the hollow check point of Fig. 3.Change θ
lAnd θ
fSize and hold θ
l+ θ
f=90 °, the utility model can also carry out the two-way asymmetric sensing that reverses, shown in the solid check point of Fig. 3.In the torsional angle scope of above-mentioned =-40 °～+ 40 °, reverse sensing and have good linearty, its linear fit degree is all greater than 0.997.And, according to (4) formula, can the elastomeric shear modulus G of high-acruracy survey=1.18 * 10
9N/m
2
In the practicality, sensing moment of torsion, torsional angle or twisting stress as required, and according to (1) formula～(3) formula design optical fiber bidirectional torque sensor, optical fiber bidirectional torsional angle sensor or optical fiber bidirectional twisting stress sensor, also can be according to (4) formula design flexibility body modulus of shearing measuring instrument.
Claims (6)
1, a kind of novel bidirectional torsion Fibre Optical Sensor, it comprises optical fiber (1), turns round beam (2), light source (8), fine wire (4), light power meter (9), optical fiber connector (10), it is characterized in that: fine wire along with torsion beam axle to angled θ
lOblique sticking near turning round the beam free end; Optical fiber along with torsion beam axle to angled θ
fAnd constant pitch and tinsel oppositely twine, and the two ends of the fiber optic loop of winding stick on cementing agent and turn round on the beam surface; Being wrapped in the two ends of turning round the optical fiber on the beam is connected with light power meter (9) with light source respectively.
2, bidirectional torsion Fibre Optical Sensor according to claim 1, it is characterized in that: the described beam (2) of turning round is a homogeneous, symmetry, isotropic solid elastomeric, xsect is circular, its material can be organic glass, metal, alloy, plastics, rubber or nylon, turn round an end of beam and fix other end freedom.
3, bidirectional torsion Fibre Optical Sensor according to claim 1 is characterized in that: described optical fiber (1) is multimode optical fiber.
4, bidirectional torsion Fibre Optical Sensor according to claim 1 is characterized in that: described fine wire (4) xsect is for circular, and its material can be metal, alloy.
5, bidirectional torsion Fibre Optical Sensor according to claim 1 is characterized in that: the tiltedly sticking angle θ of described fine wire
lWith the tiltedly sticking angle θ of optical fiber
fScope be 5 °-45 °, and θ
l+ θ
f=90 °.
6, bidirectional torsion Fibre Optical Sensor according to claim 1 is characterized in that: the described sensing of reversing is two-way, and two-way finger clockwise, counterclockwise.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU022912606U CN2599557Y (en) | 2002-12-18 | 2002-12-18 | Bidirectional torsioning optical fibre sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU022912606U CN2599557Y (en) | 2002-12-18 | 2002-12-18 | Bidirectional torsioning optical fibre sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2599557Y true CN2599557Y (en) | 2004-01-14 |
Family
ID=34151509
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU022912606U Expired - Fee Related CN2599557Y (en) | 2002-12-18 | 2002-12-18 | Bidirectional torsioning optical fibre sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2599557Y (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1300571C (en) * | 2004-08-24 | 2007-02-14 | 西安科技大学 | Snake type fiber-optical sensor burying and detecting method and its snake type fibre-optical sensor |
| CN101806646A (en) * | 2010-04-02 | 2010-08-18 | 中国计量学院 | Intensity demodulation lamp cap torque optical sensor |
| CN102203576B (en) * | 2008-09-23 | 2013-07-31 | 沃依特专利有限责任公司 | Industrial roll with optical roll cover sensor system |
| CN103697224A (en) * | 2012-09-28 | 2014-04-02 | 四川奥格科技有限公司 | Safety valve intelligent monitoring system |
| CN106351646A (en) * | 2016-09-23 | 2017-01-25 | 北京信息科技大学 | Underground sticking point measuring system equipped with fiber bragg grating sensor |
-
2002
- 2002-12-18 CN CNU022912606U patent/CN2599557Y/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1300571C (en) * | 2004-08-24 | 2007-02-14 | 西安科技大学 | Snake type fiber-optical sensor burying and detecting method and its snake type fibre-optical sensor |
| CN102203576B (en) * | 2008-09-23 | 2013-07-31 | 沃依特专利有限责任公司 | Industrial roll with optical roll cover sensor system |
| CN101806646A (en) * | 2010-04-02 | 2010-08-18 | 中国计量学院 | Intensity demodulation lamp cap torque optical sensor |
| CN103697224A (en) * | 2012-09-28 | 2014-04-02 | 四川奥格科技有限公司 | Safety valve intelligent monitoring system |
| CN106351646A (en) * | 2016-09-23 | 2017-01-25 | 北京信息科技大学 | Underground sticking point measuring system equipped with fiber bragg grating sensor |
| CN106351646B (en) * | 2016-09-23 | 2020-03-24 | 北京信息科技大学 | Underground card measuring system with fiber grating sensing device |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |