CN201903352U - Optical fiber sensing device based on function materials - Google Patents
Optical fiber sensing device based on function materials Download PDFInfo
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- CN201903352U CN201903352U CN2010205070794U CN201020507079U CN201903352U CN 201903352 U CN201903352 U CN 201903352U CN 2010205070794 U CN2010205070794 U CN 2010205070794U CN 201020507079 U CN201020507079 U CN 201020507079U CN 201903352 U CN201903352 U CN 201903352U
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Abstract
The utility model discloses an optical fiber sensing device based on function materials, which comprises multiturn micro-bend components for clamping signal optical fibers. At least one part of the multiturn micro-bend components is made of the function materials, namely the whole or part of deformation teeth or the whole or part of an area for fixing the deformation teeth is made of the function materials. The function materials are materials which change following the change of physical quantity to be detected. When the physical quantity to be detected changes, the distance among the deformation teeth in the multiturn micro-bend components is changed, therefore the bending curvature of the signal optical fibers clamped among the deformation teeth is changed, and the power of light signals transmitted in the signal optical fibers is greatly changed. Moreover, by the detection of a test unit, the purpose of determining the change value of the physical quantity to be detected is achieved. As the multiturn micro-bend components are adopted, the effective length of the signal optical fibers is extended, the bending curvature of the signal optical fibers is reduced, therefore the precision is improved, the service life is prolonged, and the device has a wide application prospect.
Description
Technical field
The utility model belongs to sensory field of optic fibre, specifically relates to a kind of fibre-optical sensing device that be made of the little kinking structure with functional material characteristic, that change based on fiber microbending loss.
Background technology
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 in the optical fiber micro-bending sensor: when optical fiber is subjected to crooked disturbance, will produce bending loss, mainly be microbending loss and macrobending loss, the differentiation that both losses are not strict.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, P
OUTAnd P
INBe respectively output and input optical power, 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 sensor, 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 Optical Sensor and the purpose of precision.
Existing microbend fiber sensing device is a gullet plate cycle microbending loss formula device, typical structure is two gullet plate arranged parallel through strictness processing, and clamping has optical fiber between two parallel gullet plates, the deflection of optical fiber is very little in this device, have only hundreds of microns to cause sensing range little, be difficult to the minimum bend curvature of optical fiber is effectively controlled, the effective bending length of optical fiber also is difficult for significantly prolonging in addition, has limited the serviceable life and the usable range of such fibre-optical sensing device.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, the utility model provides a kind of fibre-optical sensing device based on functional material, what adopt is the little kinking structure of multi-ring fiber, has prolonged the effective bending length of optical fiber, makes this fibre-optical sensing device have long service life, characteristics that precision is high.
For solving the problems of the technologies described above, the technical solution adopted in the utility model is: a kind of fibre-optical sensing device based on functional material, it is characterized in that: a little curved element of multi-turn that comprises signal optical fibre is arranged, at least a portion is made of the material that dilatation takes place along with the variation of measured physical quantity in the little curved element of described multi-turn, and signal optical fibre is connected with test cell by extended fiber.
The scheme that Fibre Optical Sensor of the present utility model solves further technical matters is: the part of distortion tooth in the little curved element of described multi-turn or distortion tooth is made of the material that dilatation takes place along with the variation of measured physical quantity.
The scheme that Fibre Optical Sensor of the present utility model solves further technical matters is: the zone or the subregion wherein that are used for fixing the distortion tooth in the little curved element of described multi-turn are made of the material that dilatation takes place along with the variation of measured physical quantity.
The scheme that Fibre Optical Sensor of the present utility model solves further technical matters is: the little curved element of described multi-turn is that the little curved element that the inside by a shaped form includes two row distortion teeth of interlaced correspondence constitutes, and two row distortion between cog accompany signal optical fibre.
The scheme that Fibre Optical Sensor of the present utility model solves further technical matters is: the little curved element of described multi-turn is to have the little curved element of interlaced corresponding distortion tooth to constitute on the two adjacent rings spring wire by a spring type, and two row distortion between cog accompany signal optical fibre.
The scheme that Fibre Optical Sensor of the present utility model solves further technical matters is: the little curved element of described multi-turn is to be made of a corrugated tube, on relative two faces of the following recess of corrugated tube tube wall, be laid with the distortion tooth of interlaced correspondence respectively, hold signal optical fibre at the distortion interdental splint.
The scheme that Fibre Optical Sensor of the present utility model solves further technical matters is: the little curved element of described multi-turn is to be made of the two-layer or two-layer above little curved element of dull and stereotyped sawtooth pattern.
The scheme that Fibre Optical Sensor of the present utility model solves further technical matters is: the little curved element of described multi-turn is to be made of the little curved element of the dull and stereotyped sawtooth pattern of individual layer, and described signal optical fibre forms the multi-turn structure in the mode of coiled coil and is held in the little curved element of dull and stereotyped sawtooth pattern.
The scheme that Fibre Optical Sensor of the present utility model solves further technical matters is: outside the little curved element of described multi-turn is two-layer housing, internal layer shell is by there not being interconnected two housings to constitute, inside and outside two-layer housing is fixed together at the two ends of shell body respectively, not being connected with the two ends of the little curved element of multi-turn respectively with the fixing end of shell body of internal layer shell.
The scheme that Fibre Optical Sensor of the present utility model solves further technical matters is: the expansion coefficient difference of two-layer housing by selecting suitable expansion coefficient, makes the little curved element of multi-turn subdue Temperature Influence.
The scheme that Fibre Optical Sensor of the present utility model solves further technical matters is: two or more little curved elements of multi-turn that comprise signal optical fibre are coupled together by Transmission Fibers, constitute quasi-distributed fibre-optical sensing device.
The scheme that Fibre Optical Sensor of the present utility model solves further technical matters is: described functional material is to change the material that variation occurs with measured physical quantity, and during as the detection density of hydrogen, available functional material is a Metal Palladium; Survey methane gas, spendable functional material is a metal platinum; Survey humidity, available functional material is pi (PI) or nylon; Survey magnetic field parameter, spendable functional material is magnetostriction materials; Survey electric pulse field parameter, the optional electrostriction material of using.
The scheme that Fibre Optical Sensor of the present utility model solves further technical matters is: an end of described signal optical fibre is mounted with light reflecting device, as catoptron or fiber grating.
The scheme that Fibre Optical Sensor of the present utility model solves further technical matters is: the other end of described signal optical fibre pass through 1 end that extended fiber connects the 1X2 optical branching device, 2 ends of 1X2 optical branching device connect light source and light power meter respectively.
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 utility model compared with prior art has the following advantages:
1, based on the fibre-optical sensing device of functional material, this sensor construction is simple, reasonable in design, method of operating convenient and use-pattern is flexible, highly sensitive;
2, based on the fibre-optical sensing device of functional material, the little curved element of reason multi-turn 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, based on the fibre-optical sensing device of functional material, can adopt the bridge-type temperature compensation means of double Shell, thereby can make this device subdue the influence of environment temperature, improved measuring accuracy;
4, fibre-optical sensing device based on functional material, can be according to the needs of measured physical quantity, select different functional materials, as when surveying density of hydrogen, the functional material of selecting for use can be a Metal Palladium, Metal Palladium can be applied or be plated in the distortion tooth surface, volume can become big after Metal Palladium absorbed hydrogen, thereby the distortion tooth is increased, the signal optical fibre bending curvature that causes being clamped in the distortion between cog changes, the size of density of hydrogen is extrapolated in the variation that detects transmitting optical signal power in the signal optical fibre by detecting instrument, and other physical quantitys also can detect by similar method.
Plurality of advantages such as in sum, fibre-optical sensing device of the present utility model as can be seen has the measuring accuracy height, one-piece construction is simple, antijamming capability is strong, applied widely.The little curved component structure of the multilayer that is had can reduce the signal optical fibre bending curvature significantly, and has prolonged the effective length of signal optical fibre significantly, makes device of the present utility model have better precision and longer serviceable life.
Below by drawings and Examples, the technical scheme of utility model is described in further detail.
Description of drawings
Fig. 1 is the cut-away section structural representation of the utility model first embodiment.
Fig. 2 is the cross-sectional view at the main position of the utility model first embodiment.
Fig. 3 is the cut-away section structural representation of the utility model second embodiment.
Fig. 4 is the cross-sectional view at the main position of the utility model second embodiment.
Fig. 5 is the structural representation of the utility model the 3rd embodiment.
Fig. 6 is the cross-sectional view at the main position of the utility model the 3rd embodiment.
Fig. 7 is the structural representation of the utility model the 4th embodiment.
Fig. 8 is the cross-sectional view at the main position of the utility model the 4th embodiment.
Fig. 9 is the cut-away section structural representation of the utility model the 5th embodiment.
Description of reference numerals:
Embodiment
As Fig. 1, shown in Figure 2, the utility model has a little curved element of multi-turn that is made of shaped form housing 4 that comprises signal optical fibre 6, the following distortion tooth 4-1 and the last distortion tooth 4-2 surface coverage that are fixed in the described shaped form housing 4 have functional material 10, signal optical fibre 6 is connected with test cell 5 by extended fiber 1, test cell 5 back connect processing unit 7, it outside shaped form housing 4 two-layer housing, internal layer shell is by there not being the interconnected internal layer shell 12 of going up to constitute with 17 two housings of following internal layer shell, inside and outside two-layer housing is fixed together by point of fixity 11 at the two ends of shell body 19 respectively, one end of shaped form housing 4 is connected with the substrate 13 of last internal layer shell 12, the other end of shaped form housing 4 is connected with substrate 15, substrate 15 joins with adjustment screw rod 16, the substrate 18 of adjusting screw rod 16 and following internal layer shell 17 is threaded engagement, makes sensing device be in optimum condition by the adjusting of adjusting screw rod 16.
When the physical quantity of surveying is density of hydrogen, functional material can be selected Metal Palladium for use, Metal Palladium is plated on the distortion tooth surface, hydrogen molecule enters near the shaped form housing 4 by the bleeder vent on the shell body 19 14, volume can become big after Metal Palladium absorbed hydrogen, thereby the distortion tooth is increased, signal optical fibre 6 bending curvatures that cause being clamped in the distortion between cog change, the size of density of hydrogen is extrapolated in the variation that detects transmitting optical signal power in the signal optical fibre 6 by test cell 5, and other physical quantitys also can detect by similar method.
Certainly, in the present embodiment, the shaped form housing 4 that is out of shape the little curved element of multi-turn of tooth 4-1 and last distortion tooth 4-2 or formation down all is made of also functional material 10 and is fine, and all adopting Metal Palladium when surveying density of hydrogen also is to survey, but cost can be higher comparatively speaking.But situation is not always like this, as when surveying humidity, we can be with nylon as functional material, this shaped form housing 4 that is out of shape tooth 4-1 and last distortion tooth 4-2 and the little curved element of formation multi-turn at present all is made of functional material nylon, can process at one time the production of critical piece by methods such as injection mouldings, it is lower at this moment doing cost like this.
When surveying electric field, electromagnetic intensity or parameter, the functional material of selecting for use can be electrostriction, magnetostriction materials.
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, anti-hydrogen loss optical fiber or photonic crystal fiber; Or many signal optical fibres 6 are clamped in the distortion between cog side by side, or many signal optical fibres 6 are merged into signal optical fibre bundle or signal optical fibre band by resin.
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.
As shown in Figure 3, Figure 4, in the present embodiment, as different from Example 1: the little curved element of multi-turn is to have the element of interlaced corresponding distortion tooth to constitute on the two adjacent rings spring wire 8 by a spring type, and two row distortion between cog accompany signal optical fibre 6.In the present embodiment, the structure of remainder, annexation and principle of work are all identical with embodiment 1.
Embodiment 3
As Fig. 5, shown in Figure 6, in the present embodiment, as different from Example 1: the little curved element of multi-turn is to be made of corrugated tube 25, double-deck bridge-type temperature compensation housing is not installed outside the corrugated tube 25, on relative two faces of the following recess of corrugated tube 25 tube walls 2, be laid with the distortion tooth of interlaced correspondence respectively, hold signal optical fibre 6 at the distortion interdental splint.Wherein distortion tooth 4-1 and last distortion tooth 4-2 or corrugated tube 25 tube walls 2 are made of functional material 10 down.In the present embodiment, the structure of remainder, annexation and principle of work are all identical with embodiment 1.
As Fig. 7, shown in Figure 8, in the present embodiment, as different from Example 3: on relative two faces of the following recess in corrugated tube 25 tube walls 2 outsides, be laid with the distortion tooth of interlaced correspondence respectively, hold signal optical fibre 6 at the distortion interdental splint.Wherein distortion tooth 4-1 and last distortion tooth 4-2 or corrugated tube 25 tube walls 2 are made of functional material 10 down.In the present embodiment, the structure of remainder, annexation and principle of work are all identical with embodiment 3.
As shown in Figure 9, in the present embodiment, as different from Example 1: be mounted with light reflection mirror 21 at an end of signal optical fibre 6, the other end of signal optical fibre 6 is connected with extended fiber 1, extended fiber 1 connects 1X2 optical branching device 20,2 termination test unit 5 of 1X2 optical branching device 20, this test cell 5 is to be made of stabilized light source and light power meter, 2 ends that is to say 1X2 optical branching device 20 connect stabilized light source and light power meter respectively, test cell 5 is connected with processing unit 7 again, can make twice sweep of light signal of transmission in the signal optical fibre 6 like this, the precision and the sensitivity that have further improved this pick-up unit by signal optical fibre 6.In the present embodiment, the structure of remainder, annexation and principle of work are all identical with embodiment 1.
Constituting the little curved element of multi-turn also can be to be made of the two-layer or two-layer above little curved element of dull and stereotyped sawtooth pattern, or the little curved element of dull and stereotyped sawtooth pattern that described signal optical fibre 6 forms the multi-turn structure in the mode of coiled coil and is held on the individual layer in the little curved element of dull and stereotyped sawtooth pattern constitutes, most critical be that at least a portion in distortion tooth or fixed deformation tooth zone is to be made of functional material 10.
The above; it only is preferred embodiment of the present utility model; be not that the utility model is imposed any restrictions; everyly any simple modification that above embodiment did, change and equivalent structure are changed, all still belong in the protection domain of technical solutions of the utility model according to the utility model technical spirit.
Claims (10)
1. based on the fibre-optical sensing device of functional material, it is characterized in that: a little curved element of multi-turn that comprises signal optical fibre is arranged, at least a portion is made of the material that dilatation takes place along with the variation of measured physical quantity in the little curved element of described multi-turn, and signal optical fibre is connected with test cell by extended fiber.
2. according to the described fibre-optical sensing device based on functional material of claim 1, it is characterized in that: the part of distortion tooth in the little curved element of described multi-turn or distortion tooth is made of the material that dilatation takes place along with the variation of measured physical quantity.
3. according to the described fibre-optical sensing device based on functional material of claim 1, it is characterized in that: the zone or the subregion wherein that are used for fixing the distortion tooth in the little curved element of described multi-turn are made of the material that dilatation takes place along with the variation of measured physical quantity.
4. according to the described fibre-optical sensing device of claim 1 based on functional material, it is characterized in that: the little curved element of described multi-turn is to be made of a shaped form housing and the inner little curved element that includes two row distortion teeth of interlaced correspondence, and two row distortion between cog accompany signal optical fibre.
5. according to the described fibre-optical sensing device of claim 1 based on functional material, it is characterized in that: the little curved element of described multi-turn is to have the little curved element of interlaced corresponding distortion tooth to constitute on the two adjacent rings spring wire by a spring type, and two row distortion between cog accompany signal optical fibre.
6. according to the described fibre-optical sensing device of claim 1 based on functional material, it is characterized in that: the little curved element of described multi-turn is to be made of a corrugated tube, on relative two faces of the following recess of corrugated tube tube wall, be laid with the distortion tooth of interlaced correspondence respectively, hold signal optical fibre at the distortion interdental splint.
7. according to the described fibre-optical sensing device based on functional material of claim 1, it is characterized in that: the little curved element of described multi-turn is to be made of the two-layer or two-layer above little curved element of dull and stereotyped sawtooth pattern.
8. according to the described fibre-optical sensing device of claim 1 based on functional material, it is characterized in that: the little curved element of described multi-turn is to be made of the little curved element of the dull and stereotyped sawtooth pattern of individual layer, and described signal optical fibre forms the multi-turn structure in the mode of coiled coil and is held in the little curved element of dull and stereotyped sawtooth pattern.
9. according to the described any fibre-optical sensing device of claim 1 to 8 based on functional material, it is characterized in that: outside the little curved element of described multi-turn is two-layer housing, internal layer shell is by there not being interconnected two housings to constitute, inside and outside two-layer housing is fixed together at the two ends of shell body respectively, internal layer shell be not connected the expansion coefficient difference of two-layer housing respectively with the two ends of the little curved element of multi-turn with the fixing end of shell body.
10. according to the described any fibre-optical sensing device of claim 1 to 8 based on functional material, it is characterized in that: the signal optical fibre in the little curved element of two or more multi-turns is coupled together by Transmission Fibers, constitute quasi-distributed fibre-optical sensing device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205070794U CN201903352U (en) | 2010-08-17 | 2010-08-17 | Optical fiber sensing device based on function materials |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205070794U CN201903352U (en) | 2010-08-17 | 2010-08-17 | Optical fiber sensing device based on function materials |
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| CN201903352U true CN201903352U (en) | 2011-07-20 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110207639A (en) * | 2019-05-22 | 2019-09-06 | 南京泰普森自动化设备有限公司 | Elasticity measurement connector, elasticity measurement unit and elasticity measuring device |
-
2010
- 2010-08-17 CN CN2010205070794U patent/CN201903352U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110207639A (en) * | 2019-05-22 | 2019-09-06 | 南京泰普森自动化设备有限公司 | Elasticity measurement connector, elasticity measurement unit and elasticity measuring device |
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Granted publication date: 20110720 Termination date: 20120817 |