CN202631153U - Single-port distributed optic fiber temperature sensor with automatic compensation function - Google Patents
Single-port distributed optic fiber temperature sensor with automatic compensation function Download PDFInfo
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- CN202631153U CN202631153U CN201220215479.7U CN201220215479U CN202631153U CN 202631153 U CN202631153 U CN 202631153U CN 201220215479 U CN201220215479 U CN 201220215479U CN 202631153 U CN202631153 U CN 202631153U
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Abstract
The utility model discloses a single-port distributed optic fiber temperature sensor with an automatic compensation function. The single-port distributed optic fiber temperature sensor comprises a laser pulse light source, an optical switch and a sensing optical fiber, wherein a first wavelength division multiplexer and a second wavelength division multiplexer are arranged between the laser pulse light source and the optical switch, a starting end of the sensing optical fiber is connected with the optical switch, and a reference optical fiber temperature ring is arranged at the position close to the starting end of the sensing optical fiber; a third wavelength division multiplexer is arranged between the second wavelength division multiplexer and the optical switch, and the third wavelength division multiplexer is connected with an optical fiber spectral analyzer; and the tail end of the sensing optical fiber is connected with a single-mode optical fiber grating. Based on the existing single-port optical fiber distributed optic fiber temperature sensor, the single-mode optical fiber grating is additionally arranged at the tail end of the sensing optical fiber, the optical fiber spectral analyzer and corresponding wavelength division multiplexers are added at the front of the optical fiber, thus the reference temperatures at two ends of the sensing optical fiber can be acquired, and the temperature measurement of the integral sensing optical fiber can be compensated automatically.
Description
Technical field
The utility model relates to a kind of fibre optic temperature sensor, is a kind of single port distributed optical fiber temperature sensor that has automatic compensation function specifically.
Background technology
The principle of distributed optical fiber temperature transducer system (DTS) is based on the non-linear backscattering of Raman (Raman); Promptly under the effect of powerful pulsed light, inside of optical fibre can produce two new optical frequencies: anti-Stokes (anti-stokes) and Stokes (stokes).These two new optical frequencies be in the original signal optical frequency about (at a distance of tens nanometer).Signal on the Stokes frequency is not too responsive to the temperature on the optical fiber, and the signal on the Anti-Stokes frequency is relatively more responsive to the temperature on the optical fiber.Signal on these two new frequencies is than the temperature variation of just having reacted optical fiber like this.In system optical fiber be transmission medium be again sensor information; The intensity of the anti-Stokes light of Raman dorsad in the optical fiber has been modulated in the temperature field of optical fiber space of living in each point; Gathered space temperature information through wavelength division multiplexer and photoelectric detector; Through signal Processing, after system's demodulation temperature information is extracted from noise in real time again.Utilize the velocity of propagation of light wave in the optical fiber and time interval of optical echo dorsad simultaneously, the measured temperature point is positioned.
As shown in Figure 1; Existing dual-port DTS system is through measuring temperature curve respectively to two ports of sensor fibre; Then two groups of data are carried out overlap-add procedure, draw the distribution curve of last temperature, owing to be that dual-port is measured with fiber distance; Can carry out replenishing automatically to the optical loss of optical fiber on anti-Stokes (anti-stokes) and Stokes (stokes) frequency, but it measures length is merely sensor fibre length half.
As shown in Figure 2; Be single port DTS system, it is consistent with sensor fibre length that it measures length, promptly can reach a times of dual-port DTS system; But single port DTS system only contains a reference optical fiber temperature ring, so can not the non-homogeneous wavelength loss on the optical fiber be compensated.In addition, occurred some afterwards again and possessed the single port DTS system of automatic compensation function, but the light path of these single port DTS system is very complicated, cost is very expensive, and trace routine is also very loaded down with trivial details.
Summary of the invention
Goal of the invention: the purpose of the utility model is to overcome the defective of existing single port distributed optical fiber temperature sensor; Providing a kind of is keeping under the constant situation of original measuring distance; Can compensate wavelength loss, and the single port distributed optical fiber temperature sensor that has automatic compensation function simple in structure.
In order to solve the problems of the technologies described above, the utility model has adopted following technical scheme:
A kind of single port distributed optical fiber temperature sensor that has automatic compensation function; It comprises laser pulse light source, photoswitch and sensor fibre; Between laser pulse light source and photoswitch, be provided with a wavelength division multiplexer and No. two wavelength division multiplexers; A wavelength division multiplexer, No. two wavelength division multiplexers connect first photoelectric detector, second photoelectric detector respectively; First photoelectric detector is connected data acquisition and treating apparatus with second photoelectric detector, and the initiating terminal of sensor fibre links to each other with photoswitch, between sensor fibre and photoswitch, is provided with reference optical fiber temperature ring; Between No. two wavelength division multiplexers and photoswitch, wavelength division multiplexer is set No. three, said No. three wavelength division multiplexers connect optical fiber detector; The end of said sensor fibre links to each other with the single-mode fiber grating.
In the utility model, further, between sensor fibre and single-mode fiber grating, the optical fiber taper is set.If used optical fiber is multimode optical fiber, it is minimum that this optical fiber taper makes multimode optical fiber reduce to the modal loss between the single-mode fiber grating.
In the utility model, described optical fiber detector is spectroanalysis instrument or wavelength-voltage signal converter.
Beneficial effect: the utility model is on the basis of existing single port optical fiber distributed type fibre optic temperature sensor; End at sensor fibre has installed the single-mode fiber grating additional; Before photoswitch, install spectroanalysis instrument and corresponding wavelength division multiplexer additional, the wavelength of single-mode fiber grating can produce certain drift value with the temperature variation of sensor fibre, and optical fiber detector or wavelength-voltage signal converter just can be through the light pulse of returning; Detect the variation of optical wavelength; Thereby know the reference temperature that sensor fibre is terminal, so just can know the reference temperature at sensor fibre two ends, the temperature survey of whole sensor fibre is compensated automatically.In addition, the light path of the existing single port DTS system that possesses automatic compensation function is very complicated, and trace routine is very also loaded down with trivial details, and the utility model is simple in structure, with low cost, practical and convenient.
Description of drawings
Fig. 1 is the structural representation of existing dual-port optical fiber distributed type fibre optic temperature sensor;
Fig. 2 is the structural representation of existing single port optical fiber distributed type fibre optic temperature sensor;
Fig. 3 is the structural representation of the utility model.
Among Fig. 1,2,3, laser pulse light source 1, wavelength division multiplexer 2, No. two wavelength division multiplexers 3, first photoelectric detector 4, second photoelectric detector 5, data acquisition and treating apparatus 6, photoswitch 7, reference optical fiber temperature ring 8 and sensor fibre 9, No. three wavelength division multiplexers 10, optical fiber detector 11, optical fiber taper 12, single-mode fiber grating 13.
Embodiment:
Below in conjunction with accompanying drawing the utility model is done explanation further.
As shown in Figure 2; Existing single port distributed optical fiber temperature sensor comprises laser pulse light source 1, photoswitch 7 and sensor fibre 9; Between laser pulse light source 1 and photoswitch 7, be provided with a wavelength division multiplexer 2 and No. two wavelength division multiplexers 3; Wavelength division multiplexer 2, No. two wavelength division multiplexers 3 connect first photoelectric detector 4, second photoelectric detector 5 respectively; First photoelectric detector 4 is connected data acquisition and treating apparatus 6 with second photoelectric detector 5, and the initiating terminal of sensor fibre 9 links to each other with photoswitch 7, between sensor fibre 9 and photoswitch 7, is provided with reference optical fiber temperature ring 8.Because the single port distributed optical fiber temperature sensor only contains a reference optical fiber temperature ring, can only have reference optical fiber to calibrate to the initiating terminal of optical fiber, but owing to can't calibrate the end end of sensor fibre, resulting temperature can't compensate automatically.
The electric signal of 6 pairs first photoelectric detectors 4 of data acquisition and treating apparatus and second photoelectric detector 5 carries out continuous sampling; And calculate their ratio; Ratio by sensor fibre 9 each points and reference optical fiber temperature ring 8 places; Add the accurate reference temperature value of reference optical fiber temperature ring, just can derive the temperature information of sensor fibre each point.
As shown in Figure 3, a kind of single port distributed optical fiber temperature sensor that has automatic compensation function of the utility model is that the structure of original single port optical fiber distributed type fibre optic temperature sensor is improved.It is between No. two wavelength division multiplexers 3 and photoswitch 7, wavelength division multiplexer 10 to be set No. three, and said No. three wavelength division multiplexers 10 connect optical fiber detectors 11, and the end of sensor fibre 9 is linked to each other with single-mode fiber grating 13.If sensor fibre 9 is multimode optical fibers, then between the end of sensor fibre 9 and single-mode fiber grating 13, optical fiber taper 12 is set.Optical fiber detector 11 can be spectroanalysis instrument or wavelength-voltage signal converter.
In use; The wavelength of single-mode fiber grating 13 can produce certain drift value with the temperature variation of sensor fibre 9; Optical fiber detector or wavelength-voltage signal converter just can detect the variation of optical wavelength through the light pulse of returning, thereby knows the reference temperature of sensor fibre 9 ends; So just can know the reference temperature at sensor fibre 9 two ends, the temperature survey of whole sensor fibre 9 is compensated automatically.
At first obtain one group of temperature data that changes along sensor fibre, owing to be that single port is measured, can only have reference optical fiber to calibrate to the initiating terminal of optical fiber, but can't calibrate the end of sensor fibre, resulting temperature can't compensate automatically.Then; Send out the light pulse that a wavelength is different from front single port DTS to system, the wavelength of the FBG (Fiber Bragg Grating FBG) that sensing is terminal can variation of temperature drift about, and spectroanalysis instrument (or wavelength-voltage signal converter) just can be through the light pulse of returning; Detect the variation of optical wavelength; Thereby know the reference temperature that sensor fibre is terminal, so just know the reference temperature at sensor fibre two ends, the temperature survey of whole sensor fibre is compensated automatically.
The above only is the preferred implementation of the utility model; Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the utility model principle; Can also make some improvement and retouching, these improvement and retouching also should be regarded as the protection domain of the utility model.
Claims (3)
1. single port distributed optical fiber temperature sensor that has automatic compensation function; It comprises laser pulse light source (1), photoswitch (7) and sensor fibre (9); Between laser pulse light source (1) and photoswitch (7), be provided with a wavelength division multiplexer (2) and No. two wavelength division multiplexers (3); A wavelength division multiplexer (2), No. two wavelength division multiplexers (3) connect first photoelectric detector (4), second photoelectric detector (5) respectively; First photoelectric detector (4) is connected data acquisition and treating apparatus (6) with second photoelectric detector (5); The initiating terminal of sensor fibre (9) links to each other with photoswitch (7); Between sensor fibre (9) and photoswitch (7), be provided with reference optical fiber temperature ring (8), it is characterized in that: between No. two wavelength division multiplexers (3) and photoswitch (7), No. three wavelength division multiplexers (10) are set, said No. three wavelength division multiplexers (10) connect optical fiber detector (11); The end of said sensor fibre (9) links to each other with single-mode fiber grating (13).
2. a kind of single port distributed optical fiber temperature sensor that has automatic compensation function according to claim 1 is characterized in that: between sensor fibre (9) and single-mode fiber grating (13), optical fiber taper (12) is set.
3. a kind of single port distributed optical fiber temperature sensor that has automatic compensation function according to claim 1 and 2 is characterized in that: described optical fiber detector (11) is spectroanalysis instrument or wavelength-voltage signal converter.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201220215479.7U CN202631153U (en) | 2012-05-14 | 2012-05-14 | Single-port distributed optic fiber temperature sensor with automatic compensation function |
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| CN201220215479.7U CN202631153U (en) | 2012-05-14 | 2012-05-14 | Single-port distributed optic fiber temperature sensor with automatic compensation function |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103487167A (en) * | 2013-10-21 | 2014-01-01 | 武汉六九传感科技有限公司 | Micro optical module for multi-channel distributed optical fiber temperature sensing system |
| CN104613321A (en) * | 2015-01-30 | 2015-05-13 | 武汉工程大学 | Nuclear power plant pipeline leakage detection device and method based on distributed optical fiber temperature measurement |
| CN106768468A (en) * | 2016-11-14 | 2017-05-31 | 电子科技大学 | A kind of wavelength-division multiplex quasi-distributed optical fiber delay temperature sensor |
-
2012
- 2012-05-14 CN CN201220215479.7U patent/CN202631153U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103487167A (en) * | 2013-10-21 | 2014-01-01 | 武汉六九传感科技有限公司 | Micro optical module for multi-channel distributed optical fiber temperature sensing system |
| CN103487167B (en) * | 2013-10-21 | 2015-11-18 | 武汉六九传感科技有限公司 | A kind of Miniature optical module for hyperchannel distributed optical fiber temperature sensing system |
| CN104613321A (en) * | 2015-01-30 | 2015-05-13 | 武汉工程大学 | Nuclear power plant pipeline leakage detection device and method based on distributed optical fiber temperature measurement |
| CN106768468A (en) * | 2016-11-14 | 2017-05-31 | 电子科技大学 | A kind of wavelength-division multiplex quasi-distributed optical fiber delay temperature sensor |
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Granted publication date: 20121226 Termination date: 20150514 |
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