CN202886015U - Real-time calibrated type distributive fiber temperature measuring device - Google Patents
Real-time calibrated type distributive fiber temperature measuring device Download PDFInfo
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- CN202886015U CN202886015U CN201220589677.XU CN201220589677U CN202886015U CN 202886015 U CN202886015 U CN 202886015U CN 201220589677 U CN201220589677 U CN 201220589677U CN 202886015 U CN202886015 U CN 202886015U
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Abstract
The utility model discloses a real-time calibrated type distributive fiber temperature measuring device. The real-time calibrated type distributive fiber temperature measuring device comprises a pulse laser source, a light splitter, a detector, a referential fiber case, a calibrated fiber case, measuring fibers and a circuit module; the temperature of the referential fiber box is within a low-temperature range, and the temperature of the calibrated fiber case is within a high-temperature range; the actual-measured temperature and the calculated temperature of the fiber case can be calibrated in order to calibrate the distributive fiber temperature measuring device in real time, the influence of the measurement error due to the variation of temperature calibration coefficients of a photoelectric device caused by the temperature influence or gradual ageing over time can be removed, the accuracy in long-term measurement of the device can be improved, and the demand of industrial application can be met.
Description
Technical field
The utility model relates to a kind of distribution type optical fiber sensing equipment, particularly a kind of distributed fiber temperature measuring device of real time calibration.
Background technology
Distributed optical fiber temperature sensing device (DTS) is a kind of emerging line style fire detecting system, and it utilizes spontaneous Raman scattering effect and optical time domain reflection technology to obtain to measure along the real time temperature of fiber distribution.This device not only can the Real-time Measuring amount temperature size, and can accurately locate fire location, have measuring distance long, without the advantage such as measure blind area, anti-electromagnetic interference (EMI), be fit to work under the rugged surroundings such as inflammable and explosive, in the highway communication tunnel, the fields such as high-tension cable ditch, coal conveyer belt, oil well, dam have than widespread use.The application scenario of distributed fiber temperature measuring device all belongs to great critical infrastructures, to having relatively high expectations of temperature survey accuracy, and the stability, especially seepage of dam monitoring and the measurement of thick oil thermal extraction downhole temperature etc. that need to keep long-term are used higher to the requirement of the long-term Measurement sensibility of temperature.
In theory, utilize the temperature value that the intensity ratio of anti-Stokes Anti-stokes signal in the sensor fibre backscatter signals and Stokes signal Stokes can the optical fiber each point.In fact, because the light splitting in the distributed fiber temperature measuring device, coupling there are differences and avalanche photodide APD photodetection response has larger discreteness, therefore, the device of reporting in the paper as people such as Ye Zongshun (Ye Zongshun, Liu Yanping, Liu Guo etc. the development of temperature-measuring system of distributed fibers and application thereof, automation of hydropower plant, 2012, Vol. 33, No. 1, pp. 43-45,68), conventional distributed fiber temperature measuring device be by one section built-in length be the reference optical fiber of tens of rice or hundreds of meters as benchmark, reference optical fiber can place in the known constant temp. box of temperature, also can use thermistor, the temperature element Real-time Measurings such as platinum resistance get the temperature around the reference optical fiber, according to anti-Stokes Anti-stokes signal and the strength ratio of Stokes Stokes signal and the temperature of reference optical fiber of reference optical fiber, can eliminate because light splitting, the measuring error that coupling difference and avalanche photodide APD discreteness cause.In addition, be subject to the isolation of optical splitter, to sneak into inevitably a certain proportion of Rayleigh Rayleigh scattered light in anti-Stokes Anti-stokes signal and the Stokes Stokes signal, the Rayleigh Rayleigh scattered light of sneaking into can affect measured temperature, so distributed fiber temperature measuring device need carry out temperature calibration before dispatching from the factory or before putting into operation.In-40 ~+300 ℃ of scopes commonly used, anti-Stokes Anti-stokes signal becomes linear approximate relationship with the ratio of Stokes Stokes signal with temperature, so temperature calibration can adopt two-point method to demarcate: one section sensor fibre is placed on first low-temperature region (such as room temperature) and high-temperature area (such as 100 ℃ of Water Tanks with Temp.-controlled).Then, because the easy temperature influences of photoelectric device or progressively aging in time such as the laser diode in the distributed fiber temperature measuring device, optical splitter, avalanche photodide APD, thereby the temperature calibration coefficient affected; If do not take necessary measure, error appears in the temperature survey meeting of distributed fiber temperature measuring device, is difficult to satisfy the requirement of the long-term online stably measured of industrial environment.
Summary of the invention
In order to solve above-mentioned deficiency of the prior art, the utility model provides a kind of distributed fiber temperature measuring device of real time calibration simple in structure, to eliminate because of photoelectric device temperature influence or the aging measuring error that causes the temperature calibration index variation to cause progressively in time.
For achieving the above object, the utility model adopts following technical scheme: a kind of distributed fiber temperature measuring device of real time calibration comprises pulsed laser source, optical splitter, detector, reference optical fiber box, fiber optic calibration box, measuring optical fiber and circuit module.The output terminal of light-pulse generator links to each other with the input end of optical splitter, the first output terminal of optical splitter links to each other with reference optical fiber box, fiber optic calibration box, measuring optical fiber successively, the second output terminal of optical splitter links to each other with the input end of detector with the 3rd output terminal, and the output terminal of detector links to each other with circuit module.
It is extremely hundreds of meters optical fiber of tens of rice that described reference optical fiber box and fiber optic calibration box all coil a segment length, and the temperature of described reference optical fiber box and fiber optic calibration box is not identical, the temperature of reference optical fiber box is in 0 ~ 45 ℃ low-temperature space, and the temperature of fiber optic calibration box is in the high-temperature region more than 50 ℃.
Described light-pulse generator is semiconductor laser light resource or the fiber laser light source of narrow pulse width, high-peak power.
Described detector is avalanche photodide APD, is used for the faint fibre scattering signal of detector: anti-Stokes light and stokes light.
Because the discreteness of avalanche photodide APD is larger, 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 optical splitter and the detector, wherein the second output terminal of optical splitter links to each other with two input ends of 1 * 2 photoswitch with the 3rd output terminal, and the input end of 1 * 2 photoswitch links to each other with the input end of detector.Like this, by controlling 1 * 2 photoswitch, can optionally make anti-Stokes light or stokes light enter detector, the mode of namely surveying by timesharing realizes the detection of the stokes light of the 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 fiber temperature measuring device.
Compared with prior art, the utility model has the advantage of:
(1) distributed fiber temperature measuring device of the present utility model utilizes two reference optical fiber box and fiber optic calibration boxes that temperature is different, the reference optical fiber box that wherein is in low-temperature space is used for eliminating because the measuring error that light splitting, coupling difference and avalanche photodide APD discreteness cause, the fiber optic calibration box that is in the high-temperature region is used for the real time temperature calibration, eliminates because of photoelectric device temperature influence or the aging temperature calibration measuring error that index variation causes that causes in time.
(2) distributed fiber temperature measuring device of the present utility model is simple in structure, and cost is low, and is workable.
(3) 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 the distributed fiber temperature measuring device of a kind of real time calibration of the present utility model.
Fig. 2 is the distributed fiber temperature measuring device of the real time calibration 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 fiber temperature measuring device of real time calibration comprises pulsed laser source 1, optical splitter 2, detector 3, reference optical fiber box 4, fiber optic calibration box 5, measuring optical fiber 6 and circuit module 7.The output terminal of light-pulse generator 1 links to each other with the input end of optical splitter 2, the first output terminal of optical splitter 2 links to each other with reference optical fiber box 4, fiber optic calibration box 5, measuring optical fiber 6 successively, the second output terminal of optical splitter 2 links to each other with the input end of the 3rd output terminal with detector 3, and the output terminal of detector 3 links to each other with circuit module 7.
Described light-pulse generator 1 is semiconductor laser light resource or the fiber laser light source of narrow pulse width, high-peak power.The present embodiment preferred center wavelength is the fiber laser light source of 1550nm, and pulse width 2 ~ 100ns is adjustable, and peak power 0.5 ~ 100W is adjustable.
Described optical splitter 2 is for separating of the optical fiber backscatter signals, the present embodiment adopts 1 * 3 Raman WDM optical splitter, and wherein input end is the transmission of 1550nm light, and the first output terminal is common port, the second output terminal is the transmission of 1450nm light, and the 3rd output terminal is the transmission of 1660nm light.
Described reference optical fiber box 4 and fiber optic calibration box 5 all coil one section optical fiber, is that tens of rice are to hundreds of rice according to the fiber lengths of measuring the needs coiling.The temperature of described reference optical fiber box 4 is in 0 ~ 45 ℃ low-temperature space, can adopt thermostatically controlled mode, also can platinum resistance etc. the mode measured in real time of temperature element.The temperature of described fiber optic calibration box is in the high-temperature region more than 50 ℃.Reference optical fiber box 4 inner discs are wound with approximately 50 meters bare fibre in the present embodiment, and temperature adopts thermostatically controlled mode in the box, and temperature is controlled at 25 ± 0.5 ℃; Fiber optic calibration box 5 inner discs are wound with approximately 50 meters bare fibre, and temperature adopts thermostatically controlled mode in the box, and temperature is controlled at 80 ± 0.5 ℃.
Described measuring optical fiber 5 can be single-mode fiber or multimode optical fiber.The present embodiment is for increasing backscatter signals intensity, the communication multimode optical fiber of preferred GI62.5/125.
Described detector 3 comprises the first detector 31 and the second detector 32, link to each other with the 3rd output terminal with the second output terminal of optical splitter 2 respectively, be used for surveying anti-Stokes light and the Stokes light signal that returns from measuring optical fiber 6, because signal is very faint, the present embodiment preferably has the avalanche photodide InGaAs APD of internal gain.
Described circuit module 7 receives the electric signal of the first detector 31 and the second detector 32.
In this specific embodiment, the laser pulse light source 1 of high power, narrow pulsewidth enters reference optical fiber box 4, fiber optic calibration box 5 and measuring optical fiber 6 successively behind optical splitter 2, return dorsad the Raman scattering signal from measuring optical fiber 6 and again isolate the Stokes Stokes light of temperature sensitive anti-Stokes Anti-stokes light and temperature-insensitive through optical splitter 2, and surveyed by the first detector 31 and the second detector 32 respectively.The temperature of reference optical fiber box 4 is in the low-temperature space of near room temperature, utilize 4 conducts of reference optical fiber box with reference to the unit, namely with anti-Stokes and the intensity ratio of Stokes and the observed temperature of reference optical fiber box 4 of reference optical fiber box 4, calculate the temperature value of any point on fiber optic calibration box 5 and the measuring optical fiber 6, eliminate because the measuring error that light splitting, coupling difference and avalanche photodide APD discreteness cause.And the temperature of fiber optic calibration box 5 is in the high-temperature region greater than 50 ℃, because fiber optic calibration box 5 adopts thermostatic control, temperature obtains by high-precision temperature element in the box, therefore utilize observed temperature and the accounting temperature take reference optical fiber box 4 as reference data of fiber optic calibration box 5 to carry out real time calibration to the temperature calibration coefficient of device, eliminate because of photoelectric device temperature influence or the aging measuring error that causes in time.This device has increased the fiber optic calibration box of a high temperature section on the basis of reference optical fiber box, can carry out real time calibration to distributed fiber temperature measuring device, the impact that abatement device is aging, the long-term measurement accuracy of raising device.
Embodiment 2
As shown in Figure 2, a kind of distributed fiber temperature measuring device of real time calibration of single detector comprises pulsed laser source 1, optical splitter 2, detector 3, reference optical fiber box 4, fiber optic calibration box 5, measuring optical fiber 6, circuit module 7 and 1 * 2 photoswitch 8.As different from Example 1, increased by 1 * 2 photoswitch 8 between described optical splitter 2 and detector 3, detector 3 is single detector.The second output terminal of described optical splitter 2 and the 3rd output terminal link to each other with two input ends of described 1 * 2 photoswitch 8 respectively, and the output terminal of described 1 * 2 photoswitch 8 links to each other with the input end of detector 3, and the output terminal of detector 3 links to each other with circuit module 7.
1 * 2 photoswitch 8 can be selected the photoswitch of MEMS structure or physical construction formula, the photoswitch of the preferred MEMS structure of the present embodiment.The second output terminal of optical splitter 2 and the 3rd output terminal 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 8, this moment can be by control 1 * 2 photoswitch 8, can optionally make anti-Stokes light or stokes light enter detector 3, the mode of surveying by timesharing this moment realizes the detection of the stokes light of single detector 3 thermally sensitive anti-Stokes lights and temperature-insensitive, reduce the conforming problem of detector, improve the long-term temperature measurement accuracy of distributed fiber temperature measuring device.
Claims (5)
1. the distributed fiber temperature measuring device of a real time calibration, comprise pulsed laser source, optical splitter, detector, the reference optical fiber box, measuring optical fiber and circuit module, characterized by further comprising the fiber optic calibration box, the output terminal of described light-pulse generator links to each other with the input end of described optical splitter, the first output terminal of described optical splitter successively with described reference optical fiber box, described fiber optic calibration box and described measuring optical fiber link to each other, the second output terminal of described optical splitter links to each other with the input end of described detector with the 3rd output terminal, and the output terminal of described detector links to each other with described circuit module.
2. the distributed fiber temperature measuring device of a kind of real time calibration according to claim 1, the temperature that it is characterized in that described reference optical fiber box and fiber optic calibration box is not identical, the temperature of described reference optical fiber box is in 0 ~ 45 ℃ low-temperature space, and the temperature of described fiber optic calibration box is in the high-temperature region more than 50 ℃.
3. the distributed fiber temperature measuring device of a kind of real time calibration according to claim 1 is characterized in that described light-pulse generator is semiconductor laser light resource or the fiber laser light source of narrow pulse width, high-peak power.
4. the distributed fiber temperature measuring device of a kind of real time calibration according to claim 1 is characterized in that described detector is avalanche photodide APD.
5. the distributed fiber temperature measuring device of a kind of real time calibration according to claim 1, it is characterized in that also being provided with 1 * 2 photoswitch between described optical splitter and the described detector, described the second output terminal links to each other with two input ends of described 1 * 2 photoswitch respectively with the 3rd output terminal, and the output terminal of described 1 * 2 photoswitch links to each other with the input end of described detector.
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| CN201220589677.XU CN202886015U (en) | 2012-11-11 | 2012-11-11 | Real-time calibrated type distributive fiber temperature measuring device |
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| CN201220589677.XU CN202886015U (en) | 2012-11-11 | 2012-11-11 | Real-time calibrated type distributive fiber temperature measuring device |
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Cited By (4)
| 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 |
| CN106443927A (en) * | 2016-11-29 | 2017-02-22 | 北京天海蓝业科技有限公司 | Optical fiber filtering device |
| CN106500868A (en) * | 2016-10-26 | 2017-03-15 | 上海市政工程设计研究总院（集团）有限公司 | Dykes and dams and the dykes and dams monitoring internal temperature system based on distribution type fiber-optic |
| CN108731839A (en) * | 2018-05-07 | 2018-11-02 | 珠海西默电气股份有限公司 | The method of distributed optical fiber temperature sensing system and the automatic parameter for obtaining calibration |
-
2012
- 2012-11-11 CN CN201220589677.XU patent/CN202886015U/en not_active Expired - Lifetime
Cited By (5)
| 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 |
| CN106500868A (en) * | 2016-10-26 | 2017-03-15 | 上海市政工程设计研究总院（集团）有限公司 | Dykes and dams and the dykes and dams monitoring internal temperature system based on distribution type fiber-optic |
| CN106443927A (en) * | 2016-11-29 | 2017-02-22 | 北京天海蓝业科技有限公司 | Optical fiber filtering device |
| CN106443927B (en) * | 2016-11-29 | 2019-07-16 | 北京天海蓝业科技有限公司 | A kind of optical fiber filter |
| CN108731839A (en) * | 2018-05-07 | 2018-11-02 | 珠海西默电气股份有限公司 | The method of distributed optical fiber temperature sensing system and the automatic parameter for obtaining calibration |
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Address after: Hangzhou City, Zhejiang Province, 310051 Binjiang District West Road No. 99 Court Street Letter No. 4 Building 5 floor West Patentee after: HANGZHOU SENSYS PHOTOELECTRIC Co.,Ltd. Address before: 310051 room 3, building 88, 118 Jiangling Road, Binjiang District, Zhejiang, Hangzhou Patentee before: HANGZHOU SENSYS PHOTOELECTRIC Co.,Ltd. |
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Granted publication date: 20130417 |
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| CX01 | Expiry of patent term |