CN203259128U - Optical fiber strain transducer for eliminating the effects of temperature - Google Patents
Optical fiber strain transducer for eliminating the effects of temperature Download PDFInfo
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- CN203259128U CN203259128U CN 201320267843 CN201320267843U CN203259128U CN 203259128 U CN203259128 U CN 203259128U CN 201320267843 CN201320267843 CN 201320267843 CN 201320267843 U CN201320267843 U CN 201320267843U CN 203259128 U CN203259128 U CN 203259128U
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Abstract
The utility model relates to an optical fiber strain transducer for eliminating the effects of temperature. The optical fiber strain transducer comprises a light, an input optical fiber, a double-core optical fiber, an output optical fiber and an optical spectrum analyzer. An air layer is arranged in the middle of the double-core optical fiber, and fiber cores are symmetrically arranged on two sides of the air layer of the double-core optical fiber. The beneficial effects of the utility model are that: by using the double-core optical fiber as a substrate, the optical fiber strain transducer has a full-optical fiber structure, and compared with a traditional optical fiber strain transducer, the size and the weight of the optical fiber strain transducer for eliminating the effect of temperature is greatly reduced; two interference arms are arranged in the same optical fiber, so the effects of temperature on the transducer are eliminated; and the air layer between the two interference arms prevents light from coupling between the two fiber cores, and improves the sensitivity of the transducer.
Description
Technical field
The utility model relates to a kind of fibre optic strain sensor of eliminating temperature effect.
Background technology
At present, strain transducer generally has following weak point on the market: make complexity, production cost is larger, and sensitivity is lower, and higher to coherence's requirement of light source, temperature stability is poor, and therefore present Fibre Optical Sensor need to carry out temperature compensation.
The utility model content
The purpose of this utility model provides a kind of fibre optic strain sensor of eliminating temperature effect, to overcome present prior art above shortcomings.
The purpose of this utility model is to be achieved through the following technical solutions:
A kind of fibre optic strain sensor of eliminating temperature effect, comprise the light source, input optical fibre, twin-core fiber, output optical fibre and the spectroanalysis instrument that are linked in sequence successively, the middle part of described twin-core fiber is provided with air layer, and the symmetria bilateralis that is positioned at air layer on the described twin-core fiber is provided with fibre core.
Further, described input optical fibre is the multimode input optical fibre, and described output optical fibre is multimode output optical fiber.
Selectable, described input optical fibre can also be the single mode input optical fibre, and described output optical fibre can also be single-mode output optical fiber.
Selectable, described input optical fibre can also be interconnective single mode input optical fibre and GRIN Lens, described output optical fibre can also be interconnective GRIN Lens and single-mode output optical fiber, and the two ends of described twin-core fiber all are connected with described GRIN Lens.
Further, the junction of described input optical fibre and twin-core fiber, twin-core fiber and output optical fibre is equipped with the epoxy sealing circle.
The beneficial effects of the utility model are: the utility model has all optical fibre structure take twin-core fiber as matrix, and volume and weight is compared the traditional fiber strain transducer and all greatly reduced; Owing to interfere arm in same optical fiber, eliminated the impact of temperature on sensor for two; Interfere the middle air layer of arm to stop the coupling of light between two fibre cores, the sensitivity that has improved sensor.
Description of drawings
The below is described in further detail the utility model with reference to the accompanying drawings.
Fig. 1 is one of structural representation of the described a kind of fibre optic strain sensor of eliminating temperature effect of the utility model embodiment;
Fig. 2 is that the A of twin-core fiber shown in the figure one is to view;
Fig. 3 be the described a kind of fibre optic strain sensor of eliminating temperature effect of the utility model embodiment structural representation two;
Fig. 4 be the described a kind of fibre optic strain sensor of eliminating temperature effect of the utility model embodiment structural representation three.
Among the figure:
1, light source; 2, input optical fibre; 3, twin-core fiber; 4, output optical fibre; 5, spectroanalysis instrument; 6, air layer; 7, fibre core; 8, epoxy sealing circle.
Embodiment
Shown in Fig. 1-2, the described a kind of fibre optic strain sensor of eliminating temperature effect of the utility model embodiment, comprise the light source 1, input optical fibre 2, twin-core fiber 3, output optical fibre 4 and the spectroanalysis instrument 5 that are linked in sequence successively, the middle part of described twin-core fiber 3 is provided with air layer 6, and the symmetria bilateralis that is positioned at air layer 6 on the described twin-core fiber 3 is provided with fibre core 7.Input optical fibre 2 is the multimode input optical fibre, output optical fibre 4 is multimode output optical fiber, welding is carried out with multimode input optical fibre, multimode output optical fiber respectively by optical fiber splicer in the two ends of twin-core fiber 3, be cut into air layer 6 with laser instrument between two fibre cores 7, the optical fiber bonding pad is cleaned, then carried out package curing with epoxy sealing circle 8.
Light source 1 sends light signal, enter twin-core fiber 3 through the multimode input optical fibre, be input to respectively in two fibre cores 7 of twin-core fiber 3, form coherent light, at this moment two of twin-core fiber 3 fibre cores 7 are that two of sensor interfere arms, owing to be provided with air layer 6 between two fibre cores 7, stoped the coupling of light between two fibre cores 7.Two ways of optical signals outputs to multimode output optical fiber through behind the other end of twin-core fiber 3, forms interference light, and process spectroanalysis instrument 5 is finished the detection to interference signal.
The described light source 1 of present embodiment is white light source, the length of multimode input optical fibre and multimode output optical fiber is 30m, the length of twin-core fiber 3 is 500m, the diameter of multimode input optical fibre fibre core and multimode output fiber core is 62.5um, fibre core 7 diameters of twin-core fiber 3 are 50um, and the edge minimum distance of two fibre cores 7 of twin-core fiber 3 is 50um; The length of air layer 6 is 490m, and width is 30um.
As shown in Figure 3, input optical fibre 2 is the single mode input optical fibre, output optical fibre 4 is single-mode output optical fiber, welding is carried out with single mode input optical fibre, single-mode output optical fiber respectively by optical fiber splicer in the two ends of twin-core fiber 3, be cut into air layer 6 with laser instrument between two fibre cores 7, the optical fiber bonding pad is cleaned, then carried out package curing with epoxy sealing circle 8.
Light source 1 sends light signal, enter twin-core fiber 3 through the single mode input optical fibre, be coupled to respectively two fibre cores 7, form coherent light, at this moment two two interference arms that fibre core 7 is sensor, owing to designed air layer 6 between two fibre cores 7, stoped the coupling of light between two fibre cores 7, two ways of optical signals is coupled to single-mode output optical fiber through behind the other end of twin-core fiber 3, form interference light, process spectroanalysis instrument 5 is finished the detection to interference signal.
The described light source 1 of present embodiment is LASER Light Source, the length of single mode input optical fibre and single-mode output optical fiber is respectively 30m and 60m, the length of twin-core fiber 3 is 50km, the diameter of single mode input optical fibre fibre core and single-mode output fiber core is 9um, the diameter of two fibre cores 7 of twin-core fiber 3 is 100um, and the edge minimum distance of two fibre cores 7 of twin-core fiber 3 is 90um; The length of air layer 6 is 49km, and width is 70um.
As shown in Figure 4, input optical fibre 2 comprises single mode input optical fibre and GRIN Lens, output optical fibre 4 comprises GRIN Lens and single-mode output optical fiber, and the single mode input optical fibre is connected with twin-core fiber and is connected by GRIN Lens, and twin-core fiber 3 is also with single-mode output optical fiber and connected by GRIN Lens.
Light source 1 sends light signal, enters GRIN Lens through the single mode input optical fibre, becomes parallel rays by GRIN Lens, and namely GRIN Lens has realized the effect of collimation; Parallel rays is input to respectively two fibre cores 7 of twin-core fiber 3, form coherent light, at this moment twin-core light, 3 two fibre cores 7 are that two of sensor interfere arm, owing to designed air layer 6 between two fibres 7, have stoped the coupling of light between two fibre cores 7, then the other end through twin-core fiber 3 outputs to GRIN Lens, output to single-mode output optical fiber after parallel rays converges, form interference light, namely GRIN Lens has realized the effect that focuses on; Finish detection to interference signal finally by crossing spectroanalysis instrument 5.
The described light source 1 of present embodiment is wideband light source, GRIN Lens is the GRIN Lens of 1/4th pitches, the length of single mode input optical fibre and single-mode output optical fiber is respectively 30m and 50m, the length of twin-core fiber 3 is 200km, the diameter of single mode input optical fibre fibre core and the diameter of single-mode output fiber core are 9um, the diameter of two fibre cores 7 of twin-core fiber 3 is 400um, and the edge minimum distance of two fibre cores 7 of twin-core fiber 3 is 100um; The length of air layer 6 is 199km, and width is 70um.
The utility model is not limited to above-mentioned preferred forms; anyone can draw other various forms of products under enlightenment of the present utility model; no matter but do any variation in its shape or structure; every have identical with a application or akin technical scheme, all drops within the protection domain of the present utility model.
Claims (7)
1. fibre optic strain sensor of eliminating temperature effect, comprise the light source (1), input optical fibre (2), twin-core fiber (3), output optical fibre (4) and the spectroanalysis instrument (5) that are linked in sequence successively, it is characterized in that: the middle part of described twin-core fiber (3) is provided with air layer (6), and the symmetria bilateralis that is positioned at air layer (6) on the described twin-core fiber (3) is provided with fibre core (7).
2. a kind of fibre optic strain sensor of eliminating temperature effect according to claim 1, it is characterized in that: described input optical fibre (2) is the multimode input optical fibre; Described output optical fibre (4) is multimode output optical fiber.
3. a kind of fibre optic strain sensor of eliminating temperature effect according to claim 1, it is characterized in that: described input optical fibre (2) is the single mode input optical fibre, and described output optical fibre (4) is single-mode output optical fiber.
4. a kind of fibre optic strain sensor of eliminating temperature effect according to claim 1 is characterized in that: described input optical fibre (2) is interconnective single mode input optical fibre and GRIN Lens.
5. a kind of fibre optic strain sensor of eliminating temperature effect according to claim 4, it is characterized in that: described output optical fibre (4) is interconnective GRIN Lens and single-mode output optical fiber.
6. a kind of fibre optic strain sensor of eliminating temperature effect according to claim 5, it is characterized in that: the two ends of described twin-core fiber (3) are connected with described GRIN Lens respectively.
7. a kind of fibre optic strain sensor of eliminating temperature effect according to claim 1 and 2 is characterized in that: described input optical fibre (2) and twin-core fiber (3) and twin-core fiber (3) are equipped with epoxy sealing circle (8) with the junction of output optical fibre (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320267843 CN203259128U (en) | 2013-05-15 | 2013-05-15 | Optical fiber strain transducer for eliminating the effects of temperature |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320267843 CN203259128U (en) | 2013-05-15 | 2013-05-15 | Optical fiber strain transducer for eliminating the effects of temperature |
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| Publication Number | Publication Date |
|---|---|
| CN203259128U true CN203259128U (en) | 2013-10-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201320267843 Expired - Fee Related CN203259128U (en) | 2013-05-15 | 2013-05-15 | Optical fiber strain transducer for eliminating the effects of temperature |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103868467A (en) * | 2014-03-31 | 2014-06-18 | 宁波良和路桥科技有限公司 | Optical fiber strain sensor eliminating temperature influences |
| CN113063364A (en) * | 2021-03-16 | 2021-07-02 | 南京嘉兆仪器设备有限公司 | Test method for comparing optimality of optical cable types in pipeline hoop strain monitoring |
-
2013
- 2013-05-15 CN CN 201320267843 patent/CN203259128U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103868467A (en) * | 2014-03-31 | 2014-06-18 | 宁波良和路桥科技有限公司 | Optical fiber strain sensor eliminating temperature influences |
| CN113063364A (en) * | 2021-03-16 | 2021-07-02 | 南京嘉兆仪器设备有限公司 | Test method for comparing optimality of optical cable types in pipeline hoop strain monitoring |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131030 Termination date: 20200515 |