CN1888940A - Differential optical fiber micro bend sensor - Google Patents
Differential optical fiber micro bend sensor Download PDFInfo
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- CN1888940A CN1888940A CNA200510035613XA CN200510035613A CN1888940A CN 1888940 A CN1888940 A CN 1888940A CN A200510035613X A CNA200510035613X A CN A200510035613XA CN 200510035613 A CN200510035613 A CN 200510035613A CN 1888940 A CN1888940 A CN 1888940A
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- optical fiber
- distortion
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Abstract
A differential fiber minor curved sensor, that is: two deformed tines fix on two frameworks, the needle of the two deformed tines on the different framework lay comparatively to form the deformed tine couple, structures two fiber deformed equipment. The two fibers set the tine gap of the two pair of deformed tine respectively. Adjusting the framework position in advance that forms the same curve of the two fibers. When the two frameworks moves, the light power wasting is increase if the curve degree of one fiber is high, the light power wasting is decrease if the curve degree of one fiber is low, that forms the differential fiber minor curved sensor. The differential fiber minor curved sensor can not only use to test the parameter, namely pressure, displacement, stress, strain, acceleration and temperature, but also estimate the direction of the tested vector parameter.
Description
Technical field
The present invention is a kind of differential optical fiber micro bend sensor, refers in particular to the Fibre Optical Sensor that utilizes bending loss of optical fiber Displacement Measurement, power, stress, strain, temperature and acceleration etc. and export with differential wave.It is to belong to optical detection device.
Background technology
Optical fiber micro-bending sensor is that J.N.Fields in 1980 and J.H.Cole propose first, belongs to intensity modulation type Fibre Optical Sensor.Its principle of work is based on the bending of optical fiber and the intensity loss that produces.When fibre-optical bending, the emergence pattern coupling, the guided mode scattering is a radiation mode, thereby produces bending loss.Optical fiber micro-bending sensor except the advantage of highly sensitive, the anti-electromagnetic interference (EMI) that has general Fibre Optical Sensor to have, corrosion-resistant, essential safety etc., few, the advantages such as cost is low, easy assembling of parts simple in structure in addition, required.Particularly utilize the optical time-domain analyzer technology can form the distribution type fiber-optic test macro, have very important using value and realistic meaning.Along with the research and the application with fiber optic materials of developing rapidly of Fibre Optical Communication Technology, and the stability of luminous intensity measurement system is improved in recent years, and the microbend fiber sensor has obtained development faster.The microbend fiber sensor has been used for many physical quantitys such as detection power, pressure, displacement, liquid level, stress, strain, temperature and pH value.
In the existing document, Chinese scholars is to the research of optical fiber micro-bending sensor, mainly concentrates on (document [1]: John, W.Berthold, III. in theory, characteristic and the application of sensor; Historical review of microbend fber-optic sensors, Journal of Lightwave Technology, 1995,13 (7): 1193～1199).Patent of invention " optical fiber micro-bending sensor " (document [2]: patent of invention, publication number: CN1156819A, application number: be can measure the problem that member draws the Shen strain in order to solve 96116927.3), size is bigger, inconvenience is installed, on using, has significant limitation.In the middle of these researchs, the existing fiber microbend sensor can only be used to measure single tested parameter usually, just be used for the strain measurement of member as document [2], and document [3] and [4] just is used for measuring liquid level and temperature.([3] S.F. Knowles, B.E.Jones, S.Purdy, C.M.France, Multiple microbending optical-fiber sensors for measurement of fuel quantity in aircraft fule tanks, Sensors and Actuators A:Physical, 1998,68 (1-3): 320～323.[4] Ma Naibing, Luo Fei, Zhang Deyin, the optical fiber micro-bending pressure transducer, optical fiber and cable and application technology thereof, 1999, (1): 42-45.).In the middle of actual measurement, not only need to measure the size of parameter sometimes, but also need to judge positive and negative (being the direction of displacement) of displacement, be pulling force or pressure, and judge that tested member is to draw Shen strain or compressive strain etc.The existing fiber microbend sensor generally can only be measured the tested parameter of single direction.
Summary of the invention
The existing fiber microbend sensor has that to measure parameter single and can only measure the shortcoming of folk prescription to parameter, the invention provides a kind of design and implementation scheme of differential optical fiber micro bend sensor, effect is not only to measure the size of parameter, and can judge the direction of parameter.Under many circumstances, the direction of displacement, power, stress, strain and acceleration can be sent out change, and the present invention can satisfy this requirement.Have simple in structure, highly sensitive, easy for installation, the little plurality of advantages of volume.
The present invention is based on and takes place littlely when curved when optical fiber, and the light intensity signal is decayed in the optical fiber, produces bending loss.This is because optical fiber takes place littlely when curved, produces Mode Coupling in the optical fiber, and the guided mode scattering is a radiation mode, and promptly the guided mode that transmits in the fibre core is radiated outside the optical fiber.Feature of the present invention is: fixedly mount two distortion teeth on two skeletons respectively, two distortion tooth formation distortion staggered relatively teeth on the different skeletons are right, form two fibre strain devices.Two optical fiber places respectively between the right backlash of the two pairs of bent forming teeth, adjusts frame position in advance and makes two optical fiber produce the bending of same degree.When two skeleton generation relative positions move, a fibre-optical bending distortion aggravation, the microbending loss of optical fiber increases, and another optical fiber micro-bending distortion weakens, and the microbending loss of optical fiber reduces.The signal increase and decrease of two optical fiber changes all the time on the contrary, thereby constitutes differential optical fiber micro bend sensor.By measuring the light intensity signal of two optical fiber, obtain size and Orientation to be measured.Two skeletons are fixed on respectively on the tested member, and stress or strain that can sensing member become stress or strain transducer.Also can fix one of them skeleton, press (drawing) masterpiece to be used on the another one skeleton, make two skeletons produce and relatively move, be used for measuring (drawing) power of pressure, become pressure (drawing) force transducer.Can be used for the measurement of acceleration, temperature and liquid level equally.
Description of drawings
The present invention is further described below in conjunction with accompanying drawing and embodiment.
Fig. 1 is a schematic diagram of the present invention.
Fig. 2 is the basic structure synoptic diagram that the present invention is used for stress-strain measurement.
Fig. 3 is the basic structure synoptic diagram that the present invention is used for displacement, draws (pressure) power to measure.
1. distortion teeth among Fig. 1,2. distortion tooth, 3. optical fiber, 4. optical fiber, 5. distortion tooth, 6. distortion tooth, 7. skeleton, 8. skeleton.
1. distortion teeth among Fig. 2,2. distortion tooth, 3. optical fiber, 4. optical fiber, 5. distortion tooth, 6. distortion tooth, 7. skeleton, 8. skeleton.9. measurand, 10. support.
1. distortion teeth among Fig. 3,2. distortion tooth, 3. optical fiber, 4. optical fiber, 5. distortion tooth, 6. distortion tooth, 7. skeleton, 8. skeleton, 11. with reference to body.
Embodiment
The measuring technique scheme that the present invention is used for stress, strain is: distortion tooth 1 and distortion tooth 5 are fixed on skeleton 8, and distortion tooth 2 and distortion tooth 6 are fixed on the skeleton 7, and skeleton 7 and skeleton 8 separate independently of one another.It is right that distortion tooth 1 and distortion tooth 2 form the distortion tooth, and it is right that distortion tooth 5 and distortion tooth 6 form another one distortion tooth.Put optical fiber 3 between the backlash of the bent forming tooth that forms by distortion tooth 1 and distortion tooth 2, put optical fiber 4 between the backlash of the bent forming tooth that forms by distortion tooth 5 and distortion tooth 6, adjust two skeleton relative positions and make two optical fiber produce the bending of same degree.Skeleton 7 and skeleton 8 are separately fixed on the measurand surface, and skeleton 7 is supported in the measurand surface by support 10, forms rock-steady structure.Concrete structure as shown in Figure 2.Ess-strain on the member makes two skeletons produce and relatively moves, and changes the fibre-optical bending degree of distortion tooth centering, the measuring optical fiber light intensity signal, and stress or strain that can sensing member become stress or strain transducer.
The present invention is used for displacement, pressure (drawing) force measurement technical scheme is: distortion tooth 1 and distortion tooth 5 are fixed on skeleton 8, and distortion tooth 2 and distortion tooth 6 are fixed on the skeleton 7, and skeleton 7 and skeleton 8 separate independently of one another.It is right that distortion tooth 1 and distortion tooth 2 form the distortion tooth, and it is right that distortion tooth 5 and distortion tooth 6 form another one distortion tooth.Put optical fiber 3 between the backlash of the bent forming tooth that forms by distortion tooth 1 and distortion tooth 2, put optical fiber 4 between the backlash of the bent forming tooth that forms by distortion tooth 5 and distortion tooth 6, adjust two skeleton relative positions and make two optical fiber produce the bending of same degree.Skeleton 7 is fixed on reference on the body 11, treats that pressure measurement (drawing) power is applied on the skeleton 8, or the relative displacement that skeleton 8 is taken place with respect to skeleton 7.Relatively moving of skeleton 7 and skeleton 8 changes the fibre-optical bending degree of distortion tooth centering, and the measuring optical fiber light intensity signal can be measured the little of pressure (drawing) power, size and Orientation that also can Displacement Measurement.
Several characteristic of the present invention is reconfigured, perhaps make an amendment slightly and change, promptly formed new technical scheme, these also belong to spirit of the present invention, all drop within the protection domain of requirement of the present invention.
Claims (5)
1. differential optical fiber micro bend sensor, it is characterized in that: on two skeletons, fix two distortion teeth respectively, the crown formation distortion staggered relatively tooth of two distortion teeth on the different skeletons is right, constitute two fibre strain devices, two optical fiber places respectively between the right backlash of the two pairs of bent forming teeth.
2. require described differential optical fiber micro bend sensor as right 1, it is characterized in that two skeletons are separated from each other, and relatively moving on can occurrence positions.
3. as right 1 described differential optical fiber micro bend sensor, it is characterized in that two teeth of every pair of distortion tooth are fixed on respectively on two skeletons.
4. as right 1 described differential optical fiber micro bend sensor, the crown that wherein is out of shape tooth has certain circular arc.
5. as right 1 described differential optical fiber micro bend sensor, it is characterized in that parameter to be measured makes a fibre-optical bending distortion aggravate, the microbending loss of optical fiber increases, another fibre-optical bending is diminished, the microbending loss of optical fiber reduces, the increase and decrease of the light intensity signal in two optical fiber changes all the time on the contrary, constitutes differential type.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200510035613XA CN100383576C (en) | 2005-06-28 | 2005-06-28 | Differential optical fiber micro bend sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200510035613XA CN100383576C (en) | 2005-06-28 | 2005-06-28 | Differential optical fiber micro bend sensor |
Publications (2)
| Publication Number | Publication Date |
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| CN1888940A true CN1888940A (en) | 2007-01-03 |
| CN100383576C CN100383576C (en) | 2008-04-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB200510035613XA Expired - Fee Related CN100383576C (en) | 2005-06-28 | 2005-06-28 | Differential optical fiber micro bend sensor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105388604A (en) * | 2015-12-22 | 2016-03-09 | 精微视达医疗科技（武汉）有限公司 | Confocal miniature probe having bending alarm function and matching device and detection method thereof |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4891511A (en) * | 1988-08-31 | 1990-01-02 | The Babcock & Wilcox Co. | Fiber optic microbend sensor with braided fibers |
| CN1624441A (en) * | 2003-12-04 | 2005-06-08 | 郑毅 | Fiber-optical temperature sensor |
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2005
- 2005-06-28 CN CNB200510035613XA patent/CN100383576C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105388604A (en) * | 2015-12-22 | 2016-03-09 | 精微视达医疗科技（武汉）有限公司 | Confocal miniature probe having bending alarm function and matching device and detection method thereof |
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| Publication number | Publication date |
|---|---|
| CN100383576C (en) | 2008-04-23 |
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Granted publication date: 20080423 |
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