CN202002751U - Distributed fiber temperature measuring device - Google Patents
Distributed fiber temperature measuring device Download PDFInfo
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- CN202002751U CN202002751U CN2011201008591U CN201120100859U CN202002751U CN 202002751 U CN202002751 U CN 202002751U CN 2011201008591 U CN2011201008591 U CN 2011201008591U CN 201120100859 U CN201120100859 U CN 201120100859U CN 202002751 U CN202002751 U CN 202002751U
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- 239000000835 fiber Substances 0.000 title claims abstract description 34
- 239000013307 optical fiber Substances 0.000 claims description 77
- 238000009529 body temperature measurement Methods 0.000 claims description 19
- 230000003287 optical effect Effects 0.000 claims description 9
- 239000004065 semiconductor Substances 0.000 claims description 3
- 230000003595 spectral effect Effects 0.000 abstract description 9
- 230000007774 longterm Effects 0.000 abstract description 7
- 238000004891 communication Methods 0.000 abstract description 4
- 239000000853 adhesive Substances 0.000 abstract 1
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- 238000001069 Raman spectroscopy Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 238000003780 insertion Methods 0.000 description 3
- 230000037431 insertion Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 230000002269 spontaneous effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
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- 239000003245 coal Substances 0.000 description 1
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- 238000005538 encapsulation Methods 0.000 description 1
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Abstract
The utility model discloses a distributed fiber temperature measuring device, which comprises a pulse laser source, a fiber circulator, a measuring fiber, an all-fiber spectral module, a detector and a circuit module. An output end of the pulse laser source is connected with an input end of the fiber circulator, a first output end of the fiber circulator is connected with the measuring fiber, a second output end of the fiber circulator is connected with an input end of the all-fiber spectral module, an output end of the all-fiber spectral module is connected with the detector, and the detector is connected with the circuit module. The spectral module comprises common communication-level all-fiber devices, and is free of adhesive for package, low in cost and high in long-term reliability. The utility model further provides a distributed fiber temperature measuring device using a single detector, the problem of non-uniformity of detectors is solved, and long-term temperature measuring precision is improved.
Description
Technical field
The utility model relates to a kind of fibre-optical sensing device, particularly a kind of distributed optical fiber temperature measurement device that adopts full optical fibre light splitting module.
Background technology
Distributed optical fiber temperature sensing device (DTS) is a kind of emerging line style fire detecting system, in the highway communication tunnel, field such as high-tension cable ditch, coal conveyer belt, petrochemical industry chemical industry has than widespread use.This system not only can measure the size of temperature in real time, and can accurately locate fire location, have measuring distance long, do not have the blind area of measurement, anti-electromagnetic interference (EMI), advantage such as be fit to work under the rugged surroundings such as inflammable and explosive.
The measuring principle of DTS is the spontaneous Raman scattering effect, laser pulse can produce spontaneous Raman scattering light dorsad when Optical Fiber Transmission, utilize spectral module that it is isolated the stokes light of temperature sensitive anti-Stokes light and temperature-insensitive, can obtain temperature variations along fiber distribution according to its ratio.
Chinese patent ZL200820154032.7 discloses a kind of distributed optical fiber temperature sensing device, and this device mainly comprises laser instrument, space spectral module, shutter and detector.The spectral module of this device is made up of anti-Stokes lens and stokes lens, is a kind of space beam split light channel structure based on optical element, the light path complexity, and to light path debugging precision prescribed height, reliability is low.
Chinese patent ZL200810120192.4 discloses a kind of distributed optical fiber Raman temperature sensor based on integrated-type optical fibre wavelength-division multiplex technology, and wherein integrated wavelength division multiplexer is integrated by discrete optical fiber bidirectional coupler, optical fiber parallel light path, Stokes and anti-Stokes light broad band pass filter.This device adopts fiber coupler and optical filter beam split, and optical path loss is bigger, is unfavorable for the detection of fiber raman scattering signal.
Summary of the invention
In order to solve above-mentioned deficiency of the prior art, the utility model provides a kind of distributed optical fiber temperature measurement device that adopts the full optical fibre light splitting module of low cost, high reliability.
For achieving the above object, the utility model adopts following technical scheme:
A kind of distributed optical fiber temperature measurement device comprises pulsed laser source, optical fiber circulator, measuring optical fiber, full optical fibre light splitting module, detector and circuit module.The output terminal of light-pulse generator links to each other with the input end of optical fiber circulator, first output terminal of optical fiber circulator links to each other with measuring optical fiber, second output terminal of optical fiber circulator links to each other with the input end of full optical fibre light splitting module, the output terminal of full optical fibre light splitting module links to each other with detector, and detector links to each other with circuit module.
Described light-pulse generator is the semiconductor laser light resource or the fiber laser light source of narrow pulse width, high-peak power.
Described full optical fibre light splitting module is made up of fiber grating and 1 * 2 fused tapered wavelength division multiplexer, wherein the centre wavelength of fiber grating is laser wavelength of incidence, and two output terminal separate wavelengths of wavelength division multiplexer are respectively anti-Stokes optical wavelength and Stokes optical wavelength.Because fiber grating and fused tapered wavelength division multiplexer are full fiberize device, cost is low, the insertion loss is little, the long-term reliability height, and because the insertion loss is little, in order to improve the isolation to the laser wavelength of incidence signal, described full optical fibre light splitting module can be utilized the mode of a plurality of fiber grating cascades.
Described detector is avalanche photodide APD, is used for the faint fibre scattering signal of detector.
Because the discreteness of avalanche photodide APD is bigger, for reducing avalanche photodide APD consistency problem, the utility model also proposes a kind of structure of single detector.Also have 1 * 2 photoswitch between described full optical fibre light splitting module and the detector, wherein two output terminals of full optical fibre light splitting module link to each other with two input ends of 1 * 2 photoswitch, and the input end of 1 * 2 photoswitch links to each other with detector.Like this, by controlling 1 * 2 photoswitch, can optionally make anti-Stokes light or stokes light enter detector, promptly the mode of surveying by timesharing realizes the detection of the stokes light of thermally sensitive anti-Stokes light of single detector and temperature-insensitive, reduce the conforming problem of detector, improve the long-term temperature measurement accuracy of distributed optical fiber temperature measurement device.
The beneficial effects of the utility model: the utility model utilizes a kind of distributed optical fiber temperature measurement device of novel full fiberize spectral module, and spectral module is made up of the full fiberize device of common communication stage, need not the glue encapsulation, and cost is low, long-term reliability is high.The utility model also proposes a kind of structure of utilizing single detector, has reduced the problem of inconsistency of detector, has improved long-term temperature measurement accuracy.
Description of drawings
Fig. 1 is a kind of distributed optical fiber temperature measurement device of the present utility model;
Fig. 2 is the distributed optical fiber temperature measurement device of a kind of single detector of the present utility model.
Embodiment
Below in conjunction with drawings and Examples, the utility model is done further detailed description.
Embodiment 1:
As shown in Figure 1, a kind of distributed optical fiber temperature measurement device comprises pulsed laser source 1, optical fiber circulator 2, measuring optical fiber 3, full optical fibre light splitting module 4, detector 6 and circuit module 7.The output terminal of light-pulse generator 1 links to each other with the input end of optical fiber circulator 2, first output terminal of optical fiber circulator 2 links to each other with measuring optical fiber 3, second output terminal of optical fiber circulator 2 links to each other with the input end of full optical fibre light splitting module 4, the output terminal of full optical fibre light splitting module 4 links to each other with detector 6, and detector 6 links to each other with circuit module 7.
Described light-pulse generator 1 is the semiconductor laser light resource or the fiber laser light source of narrow pulse width, high-peak power.Present embodiment preferred center wavelength is the fiber laser light source of 1550nm, and pulse width 5～30ns is adjustable, and peak power 1～50W is adjustable.
Described optical fiber circulator 2 adopts the circulator of three ports.
Described measuring optical fiber 3 can be single-mode fiber or multimode optical fiber.Present embodiment is for increasing backscatter signals intensity, the communication multimode optical fiber of preferred GI62.5/125.
Described full optical fibre light splitting module 4 is made up of fiber grating 41 and 1 * 2 fused tapered wavelength division multiplexer 42, wherein 41 centre wavelengths of fiber grating are laser wavelength of incidence 1550nm, and two output terminal separate wavelengths of wavelength division multiplexer 42 are respectively the Stokes optical wavelength 1660nm of temperature sensitive anti-Stokes optical wavelength 1450nm and temperature-insensitive.Because the insertion loss of fiber grating 41 and fused tapered wavelength division multiplexer 42 is little, in order to improve the isolation of Rayleigh scattering light, described full optical fibre light splitting module 4 can be utilized the mode of a plurality of fiber grating cascades.Extra fiber grating can directly be added in fiber grating 41 back, also can directly be added on two output terminals of wavelength division multiplexer 42.
Described detector 6 comprises first detector 61 and second detector 62, links to each other with two output terminals of wavelength division multiplexer 42 respectively, is used for light signal is converted to electric signal.Described detector 6 is used to survey anti-Stokes light and the Stokes light signal that returns from measuring optical fiber 3, because signal is very faint, present embodiment preferably has the avalanche photodide APD of internal gain.
Described circuit module 7 receives the electric signal of first detector 61 and second detector 62, utilizes the ratio of the intensity of anti-Stokes and Stokes signal to calculate temperature distribution information, realizes large-scale fire alarm.
Embodiment 2:
As shown in Figure 2, a kind of distributed optical fiber temperature measurement device of single detector comprises pulsed laser source 1, optical fiber circulator 2, measuring optical fiber 3, full optical fibre light splitting module 4,1 * 2 photoswitch 5, detector 6 and circuit module 7.The output terminal of light-pulse generator 1 links to each other with the input end of optical fiber circulator 2, first output terminal of optical fiber circulator 2 links to each other with measuring optical fiber 3, second output terminal of optical fiber circulator 2 links to each other with the input end of full optical fibre light splitting module 4, two output terminals of full optical fibre light splitting module 4 link to each other with two input ends of 1 * 2 photoswitch 5, the output terminal of 1 * 2 photoswitch 5 links to each other with detector 6, and detector 6 links to each other with circuit module 7.
As different from Example 1, increased by one 1 * 2 photoswitch 5 between described full optical fibre light splitting module 4 and the detector 6.1 * 2 photoswitch 5 can be selected the photoswitch of MEMS structure or physical construction formula for use, the photoswitch of the preferred MEMS structure of present embodiment.Two output terminals of full optical fibre light splitting module 4 are isolated the Stokes light signal of temperature sensitive anti-Stokes light signal and temperature-insensitive, this two paths of signals links to each other with two input ends of 1 * 2 photoswitch, this moment can be by control 1 * 2 photoswitch, can optionally make anti-Stokes light or stokes light enter detector 6, the mode of surveying by timesharing this moment realizes the detection of the stokes light of thermally sensitive anti-Stokes light of single detector and temperature-insensitive, reduce the conforming problem of detector, improve the long-term temperature measurement accuracy of distributed optical fiber temperature measurement device.
Claims (5)
1. distributed optical fiber temperature measurement device, comprise pulsed laser source, optical fiber circulator, measuring optical fiber, full optical fibre light splitting module, detector and circuit module, the output terminal that it is characterized in that described light-pulse generator links to each other with the input end of optical fiber circulator, first output terminal of optical fiber circulator links to each other with measuring optical fiber, second output terminal of optical fiber circulator links to each other with the input end of full optical fibre light splitting module, the output terminal of full optical fibre light splitting module links to each other with detector, and detector links to each other with circuit module.
2. a kind of distributed optical fiber temperature measurement device according to claim 1, it is characterized in that described full optical fibre light splitting module is made up of fiber grating and 1 * 2 fused tapered wavelength division multiplexer, wherein the centre wavelength of fiber grating is laser wavelength of incidence, and two output terminal separate wavelengths of wavelength division multiplexer are respectively anti-Stokes optical wavelength and Stokes optical wavelength.
3. a kind of distributed optical fiber temperature measurement device according to claim 1 is characterized in that described light-pulse generator is the semiconductor laser light resource or the fiber laser light source of narrow pulse width, high-peak power.
4. a kind of distributed optical fiber temperature measurement device according to claim 1 is characterized in that described detector is avalanche photodide APD.
5. a kind of distributed optical fiber temperature measurement device according to claim 1, it is characterized in that also having 1 * 2 photoswitch between described full optical fibre light splitting module and the described detector, two output terminals of full optical fibre light splitting module link to each other with two input ends of 1 * 2 photoswitch, and the output terminal of 1 * 2 photoswitch links to each other with detector.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201008591U CN202002751U (en) | 2011-04-07 | 2011-04-07 | Distributed fiber temperature measuring device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011201008591U CN202002751U (en) | 2011-04-07 | 2011-04-07 | Distributed fiber temperature measuring device |
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| CN2011201008591U Expired - Lifetime CN202002751U (en) | 2011-04-07 | 2011-04-07 | Distributed fiber temperature measuring device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102967389A (en) * | 2012-11-11 | 2013-03-13 | 杭州山旭光电有限公司 | Distributed optical fiber temperature measuring device for real-time calibration and calibration method |
| CN109959404A (en) * | 2019-03-27 | 2019-07-02 | 中山水木光华电子信息科技有限公司 | Differential fiber grating recognition system |
-
2011
- 2011-04-07 CN CN2011201008591U patent/CN202002751U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102967389A (en) * | 2012-11-11 | 2013-03-13 | 杭州山旭光电有限公司 | Distributed optical fiber temperature measuring device for real-time calibration and calibration method |
| CN109959404A (en) * | 2019-03-27 | 2019-07-02 | 中山水木光华电子信息科技有限公司 | Differential fiber grating recognition system |
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