CN101922948A - Multilayer high-precision optical fiber detector based on microbending loss - Google Patents
Multilayer high-precision optical fiber detector based on microbending loss Download PDFInfo
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- CN101922948A CN101922948A CN2010102254451A CN201010225445A CN101922948A CN 101922948 A CN101922948 A CN 101922948A CN 2010102254451 A CN2010102254451 A CN 2010102254451A CN 201010225445 A CN201010225445 A CN 201010225445A CN 101922948 A CN101922948 A CN 101922948A
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Abstract
The invention discloses a multilayer high-precision optical fiber detector based on microbending loss, comprising two layers of microbending deformers composed of at least three parallel plates which are provided with mutually staggered deformation teeth, wherein every two of the parallel plates are opposite to each other; at least two parts of a signal optical fiber are respectively clamped between each layer of the microbending deformers, and the two ends of the signal optical fiber are connected with extended optical fibers, i.e. the superposition of two micrcobending sensors, thus greatly prolonging the effective length of the signal optical fiber, reducing the bending rate of the signal optical fiber, increasing the responding distance range of the optical fiber detector of the invention, improving the precision and the sensitivity of the optical fiber detector, prolonging the service life of the signal optical fiber, increasing the microbending deformer into three layers, four layers and the like, further improving the precision and the sensitivity and enabling the optical fiber detector of the invention to have wide application prospects.
Description
Technical field
The invention belongs to bending loss of optical fiber detection technique field, especially relate to a kind of high-precision optical fiber detector of the multi-layered type based on fiber microbending loss.
Background technology
The kind of existing fiber pick-up unit is very many, mainly comprise polytypes such as light intensity adjusting type Fibre Optical Sensor, fiber-optic grating sensor, optical fibre interferometric sensor, both characteristics of back are sensing sensitivity height, but in the actual application, there are defective and deficiencies such as equipment complexity, utilization and operation cost height, thereby make the application of Fibre Optical Sensor be very limited.Especially to the Fibre Optical Sensor of higher sensitivity, it can respond the change situation of various environmental baselines in the use, as optical fibre interferometric sensor, because its sensitivity is very high, but after it is applied under the physical condition, find that environmental factors such as temperature, air pressure, vibration all can impact its running parameter, thereby during actual the use, have to take multiple measure to prevent and reject above-mentioned Effect of Environmental, thereby make the structure of its monitoring equipment more and more be tending towards complicated, the operation use cost significantly improves.
And optical fiber micro-bending sensor is a kind of sensor of light intensity modulation, has the advantages that cost is low, highly sensitive, have certain environment interference, and its implementation is based on that the bending of optical fiber or microbending loss realize.By changing the degree of crook of optical fiber, thereby cause the variation of Output optical power.
The principle of optical power loss is: when optical fiber is subjected to crooked disturbance, will produce bending loss, mainly be microbending loss and macrobending loss.Both bending losss all are to cause that both losses can be calculated the bending loss size according to the theoretical formula of Marcuse owing to cause during fibre-optical bending part guided mode in the fibre core to be coupled to covering, and its formula is as follows:
P
OUT＝P
IN?exp(-γS)
Wherein, Pout and Pin are respectively output and input optical power, and γ is the bending loss coefficient, and S is crooked arc length.The bending loss coefficient gamma of optical fiber is big more as can be seen, be that fiber bending radius is more little, then loss is big more, but the too small meeting of bending radius causes the optical fiber life-span to reduce significantly, influence the serviceable life of attenuator, so the bending radius of optical fiber is restricted in the practical application; On the other hand, under identical bending loss coefficient gamma,, then can increase decay if increase crooked arc length S, can be by increasing considerably crooked arc length S, reach the dynamic range that increases substantially fibre optic attenuator and the purpose of precision.
Existing microbend fiber sensing device all is one deck structure, for prolonging the length of effective curved fiber, present method is in this one deck structure optical fiber to be coiled multi-turn at this snail, reach the purpose that prolongs effective curved fiber, but so still can not solve effective maximum present situation of having only hundreds of microns of distance that changes of existing little curved Fibre Optical Sensor, and be difficult to the minimum bend curvature of optical fiber is effectively controlled, limited the serviceable life and the usable range of such Fibre Optical Sensor like this.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, the invention provides a kind of multi-layered type optical fiber detector based on fiber microbending loss, this pick-up unit is simple in structure, reasonable in design, method of operating convenient and use-pattern is flexible, have certain environment interference, highly sensitive, owing to be the little kinking structure of multilayer, make this optical fiber detector have long service life, characteristics that precision is high.
For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of multilayer high-precision optical fiber detector based on microbending loss, it is characterized in that: comprise at least by three parallel to each other, facing each other, have a two-layer bent forming device that the plate that is out of shape tooth of staggering mutually constitutes, two parts that have at least of a signal optical fibre are clamped between the two-layer bent forming device two termination extended fibers of signal optical fibre respectively.
As stress during at the bent forming device, two-layer bent forming device counter stress is simultaneously made response, thereby the effective bending length that makes signal optical fibre doubles the bent forming device of individual layer, thereby the precision and the sensitivity of this optical fiber detector have been improved, increased the variation distance of whole bent forming device simultaneously, and can reduce the bending curvature of signal optical fibre, thereby prolonged the serviceable life of signal optical fibre.Same method can be accomplished more multi-layered bent forming devices such as three layers, four layers, thereby can make optical fiber detector of the present invention have very high precision and sensitivity.
The scheme that Fibre Optical Sensor of the present invention solves further technical matters is: have elastic component between the two boards of every layer of bent forming device of described formation.
The scheme that Fibre Optical Sensor of the present invention solves further technical matters is: the plate of described formation bent forming device by the guide rail string together.
The scheme that Fibre Optical Sensor of the present invention solves further technical matters is: described extended fiber connects test cell.
The scheme that Fibre Optical Sensor of the present invention solves further technical matters is: the extended fiber of an end of described signal optical fibre connects light reflecting device, as catoptron or fiber grating.
The scheme that Fibre Optical Sensor of the present invention solves further technical matters is: the extended fiber of an end of described signal optical fibre connects 1 end of 1X2 optical branching device, and 2 ends of 1X2 optical branching device connect light source and light power meter respectively.
The scheme that Fibre Optical Sensor of the present invention solves further technical matters is: described signal optical fibre is coated by waterproof material.
The scheme that Fibre Optical Sensor of the present invention solves further technical matters is: described waterproof material is a greasy for preventing water.
The scheme that Fibre Optical Sensor of the present invention solves further technical matters is: described signal optical fibre is for the outside optical fiber that is surrounded by the multilayer fibers protective seam, as tight tube fiber, carbon coated fiber, polyimide coated optical fiber etc.; Described signal optical fibre also can be plastic optical fiber, multi-core fiber, thin footpath optical fiber or photonic crystal fiber.
The present invention compared with prior art has the following advantages:
1, based on the multilayer high-precision optical fiber detector of microbending loss, this sensor construction is simple, reasonable in design, method of operating convenient and use-pattern is flexible, have certain environment interference, highly sensitive;
2, based on the multilayer high-precision optical fiber detector of microbending loss, reason multilayer bent forming device constitutes, increased effective bending length of signal optical fibre greatly, the precision and the sensitivity that detect have been increased on the one hand, and can reduce the bending curvature of signal optical fibre, thereby prolonged the serviceable life of signal optical fibre, made this optical fiber detector have the characteristics of long service life;
3, optical fiber detector of the present invention has been owing to adopted multilayer bent forming device, thereby can make this optical fiber detector can respond bigger stress distance, expanded the usable range of this device.
In sum, the present invention is simple in structure, reasonable in design, processing and fabricating convenient and use-pattern is flexible, highly sensitive, result of use is good, institute has multilayer bent forming device structure and can reduce the signal optical fibre bending curvature significantly, and the effective length that has prolonged signal optical fibre significantly, make optical fiber detector of the present invention have better precision and longer serviceable life.
Below by drawings and Examples, the technical scheme of inventing is described in further detail.
Description of drawings
Fig. 1 is the structural representation of the present invention's first embodiment.
Fig. 2 is the structural representation of the present invention's second embodiment.
Fig. 3 is the A-A ' cross-sectional view among Fig. 2.
Description of reference numerals:
| The 1-extended fiber; | 4-bent forming device; | The 5-test cell; |
| The 6-signal optical fibre; | The 7-processing unit; | 10-first laminate; |
| 11-second laminate; | The 12-three ply board; | The 20-guide rail; |
| 25-is out of shape tooth; | The 30-spring. |
Embodiment
Embodiment 1
As shown in Figure 1, the present invention includes comprise by 12 3 of first laminate 10, second laminate 11 and three ply boards parallel to each other, facing each other, have a two-layer bent forming device 4 that the plate that is out of shape tooth of staggering mutually constitutes, two parts that have at least of a signal optical fibre 6 are clamped between the two-layer bent forming device 4 two termination extended fibers 1 of signal optical fibre 6 respectively.
In the present embodiment, as stress during at bent forming device 4, two-layer bent forming device 4 counter stress is simultaneously made response, thereby the effective bending length that makes signal optical fibre 6 doubles the bent forming device 4 of individual layer, thereby the precision and the sensitivity of this optical fiber detector have been improved, increase the variation distance of whole bent forming device 4 simultaneously, and can reduce the bending curvature of signal optical fibre 6, thereby prolonged the serviceable life of signal optical fibre 6.Same method can be accomplished more multi-layered bent forming devices 4 such as three layers, four layers, thereby can make optical fiber detector of the present invention have very high precision and sensitivity.
The extended fiber 1 that passes through of signal optical fibre 6 is connected with test cell 5, what test cell 5 connected later is processing unit 7, the variation of signal optical fibre 6 bending curvatures can cause the variation at the light signal of signal optical fibre 6 internal transmission, can monitor the variation of this light signal by test cell 5, and carry out subsequent treatment by processing unit 7.
Described signal optical fibre 6 is for the outside optical fiber that is surrounded by the multilayer fibers protective seam, as tight tube fiber, carbon coated fiber, polyimide coated optical fiber etc.; Described signal optical fibre 6 also can be plastic optical fiber, multi-core fiber, thin footpath optical fiber or photonic crystal fiber.
Described signal optical fibre 6 and extended fiber 1 external packets are covered with waterproof material, as waterproofing unction, can further prevent the erosion of hydrone to signal optical fibre 6 and extended fiber 1, have prolonged the serviceable life of signal optical fibre 6 and extended fiber 1.
What adopt when test cell 5 is that single ended mode is when being connected with the extended fiber 1 of an end of signal optical fibre 6, when being optical time domain reflectometer (OTDR) as testing tool, or the extended fiber 1 of an end of signal optical fibre 6 connects 1 end of the shunt of 1X2, and when 2 termination light sources of 1X2 shunt and light power meter, extended fiber 1 at the other end of signal optical fibre 6 can be mounted with light reflecting device, as catoptron or fiber grating, can make twice sweep of light signal of transmission in the signal optical fibre 6, the precision and the sensitivity that have further improved this pick-up unit by signal optical fibre 6.
Embodiment 2
As Fig. 2, shown in Figure 3, in the present embodiment, as different from Example 1: every layer of bent forming device 4 all accompanies two segment signal optical fiber 6, thereby be easy to make the plate keeping parallelism of every layer of bent forming device 4, guide rail 20 and spring 30 are arranged between the plate of every layer of bent forming device 4, thereby make multilayer bent forming device 4 move more steadily.In the present embodiment, the structure of remainder, annexation and principle of work are all identical with embodiment 1.
The above; it only is preferred embodiment of the present invention; be not that the present invention is imposed any restrictions, everyly any simple modification that above embodiment did, change and equivalent structure changed, all still belong in the protection domain of technical solution of the present invention according to the technology of the present invention essence.
Claims (10)
1. based on the multilayer high-precision optical fiber detector of microbending loss, it is characterized in that: comprise at least by three parallel to each other, facing each other, have a two-layer bent forming device that the plate that is out of shape tooth of staggering mutually constitutes, two parts that have at least of a signal optical fibre are clamped between every layer of bent forming device two termination extended fibers of signal optical fibre respectively.
2. according to the described multilayer high-precision optical fiber detector of claim 1, it is characterized in that: have elastic component between the two boards of every layer of bent forming device of described formation based on microbending loss.
3. according to the described multilayer high-precision optical fiber detector based on microbending loss of claim 1, it is characterized in that: the plate of described formation bent forming device by the guide rail string together.
4. according to the described multilayer high-precision optical fiber detector based on microbending loss of claim 1, it is characterized in that: described extended fiber connects test cell.
5. according to the described multilayer high-precision optical fiber detector based on microbending loss of claim 1, it is characterized in that: the extended fiber of an end of described signal optical fibre connects light reflecting device.
6. according to the described multilayer high-precision optical fiber detector based on microbending loss of claim 5, it is characterized in that: the extended fiber of an end of described signal optical fibre connects 1 end of 1X2 optical branching device, and 2 ends of 1X2 optical branching device connect light source and light power meter respectively.
7. according to the described multilayer high-precision optical fiber detector based on microbending loss of claim 1, it is characterized in that: described signal optical fibre is coated by waterproof material.
8. according to the described multilayer high-precision optical fiber detector based on microbending loss of claim 1, it is characterized in that: described waterproof material is a greasy for preventing water.
9. according to the described multilayer high-precision optical fiber detector based on microbending loss of claim 1, it is characterized in that: described signal optical fibre is the outside optical fiber that is surrounded by the multilayer fibers protective seam.
10. according to the described multilayer high-precision optical fiber detector based on microbending loss of claim 1, it is characterized in that: described signal optical fibre is plastic optical fiber, multi-core fiber, thin footpath optical fiber or photonic crystal fiber.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104865696A (en) * | 2015-05-27 | 2015-08-26 | 成都美美通信技术有限公司 | Simple type fiber signal attenuating device |
| CN105588586A (en) * | 2015-12-11 | 2016-05-18 | 电子科技大学 | Optical fiber distributed sensing system of U-type sensing fiber deployment structure |
| CN106198207A (en) * | 2016-06-16 | 2016-12-07 | 江苏亨通光纤科技有限公司 | A kind of pressure performance test methods of fibre coating and measurement apparatus thereof |
| CN108742572A (en) * | 2018-07-02 | 2018-11-06 | 余海波 | blood pressure monitoring device, method and system |
| CN110954259A (en) * | 2019-11-27 | 2020-04-03 | 同济大学 | Gasket sensor based on optical fiber microbend loss |
| CN111707206A (en) * | 2020-06-04 | 2020-09-25 | 哈尔滨工程大学 | Quantum dot optical fiber micro-bending sensor with position detection function |
-
2010
- 2010-07-13 CN CN2010102254451A patent/CN101922948A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104865696A (en) * | 2015-05-27 | 2015-08-26 | 成都美美通信技术有限公司 | Simple type fiber signal attenuating device |
| CN105588586A (en) * | 2015-12-11 | 2016-05-18 | 电子科技大学 | Optical fiber distributed sensing system of U-type sensing fiber deployment structure |
| CN106198207A (en) * | 2016-06-16 | 2016-12-07 | 江苏亨通光纤科技有限公司 | A kind of pressure performance test methods of fibre coating and measurement apparatus thereof |
| CN108742572A (en) * | 2018-07-02 | 2018-11-06 | 余海波 | blood pressure monitoring device, method and system |
| CN110954259A (en) * | 2019-11-27 | 2020-04-03 | 同济大学 | Gasket sensor based on optical fiber microbend loss |
| CN111707206A (en) * | 2020-06-04 | 2020-09-25 | 哈尔滨工程大学 | Quantum dot optical fiber micro-bending sensor with position detection function |
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