CN203298893U - High-resolution distributed optical fiber temperature sensor and high-resolution distributed optical fiber temperature measuring device - Google Patents
High-resolution distributed optical fiber temperature sensor and high-resolution distributed optical fiber temperature measuring device Download PDFInfo
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- CN203298893U CN203298893U CN2013203089696U CN201320308969U CN203298893U CN 203298893 U CN203298893 U CN 203298893U CN 2013203089696 U CN2013203089696 U CN 2013203089696U CN 201320308969 U CN201320308969 U CN 201320308969U CN 203298893 U CN203298893 U CN 203298893U
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Abstract
The utility model discloses a high-resolution distributed optical fiber temperature sensor and a high-resolution distributed optical fiber temperature measuring device. The high-resolution distributed optical fiber temperature sensor comprises a pulse optical fiber laser, a wavelength division multiplexer, a 1*2 optical fiber coupler, a calibration optical fiber, a sensing optical fiber, a pulse photoelectric converter, photoelectric receiving modules and a data acquisition card. The high-resolution distributed optical fiber temperature sensor is characterized in that the sensor is provided with a synchronization error monitoring circuit, the data acquisition card can accurately determine the time interval between rising edges of a laser pulse trigger signal and an electrical pulse signal of the acquisition card based on precise time interval measurement of clock phase shift, and a comparison can be made between the time interval and a spatial resolution error range parameter of an upper computer so as to determine whether the trigger cycle signal is accumulated and ensure that the final spatial resolution is within the range of error. Compared with the prior art, the spatial resolution can be improved without affecting other indicators, and the requirement on pulse width of a laser can be lowered.
Description
Technical field
The utility model relates to temperature sensor, and a kind of measuring accuracy is high specifically, production cost is low, accurately and reliably, is specially adapted to high spatial resolution and detects high resolving power distributed optical fiber temperature sensor and the temperature measuring equipment of applied environment.
Background technology
Distributed optical fiber temperature sensor is a kind of optical fiber sensing system for Real-time Measuring quantity space temperature field that development in recent years is got up, this system utilizes Raman scattering effect and OTDR technology to realize distributed measurement to sensitive optical fibre temperature field of living in, compare with traditional electro-temperature sensor, the advantages such as that fibre optic temperature sensor has is highly sensitive, can resist electromagnetic interference (EMI), lightweight, the life-span is long, therefore can be widely used in the monitoring temperature and fire alarm of power cable, subway tunnel, coal mine roadway, petroleum storage tank and heavy construction.
although the research of raman type distributed optical fiber temperature sensor is relatively ripe, but still there is incomplete problem, the developing direction of distributed optical fiber temperature sensor is long distance at present, high precision, and high precision is exactly high-temperature fluctuation degree, high spatial resolution, and the long distance of realization and high-temperature fluctuation degree, the high signal to noise ratio (S/N ratio) of final pursuit, and the optical fiber temperature-measurement under the applied environment of high spatial resolution detection at present, only by controlling the individual pulse width, realize, just need to use the burst pulse light source in order to obtain high spatial resolution, but the burst pulse light source means that also luminous energy reduces, cause having limited measuring distance, simultaneously in the situation that have error between the certain periodicity back scattering light signal that brings due to laser delay jitter etc. of light source pulse width, finally cause cumulative process further to reduce the spatial resolution of system.
Summary of the invention
The utility model is for the shortcoming and defect that exists in prior art, propose a kind of rational in infrastructure, measuring accuracy is high, production cost is low, accurately and reliably, be specially adapted to high spatial resolution and detect high resolving power distributed optical fiber temperature sensor and the temperature measuring equipment of applied environment.
The utility model can reach by following measures:
A kind of high resolving power distributed optical fiber temperature sensor, be provided with the thermometric loop that is formed by pulse optical fiber, wavelength division multiplexer, calibration optical fiber, sensor fibre, photoelectricity receiver module, data collecting card, it is characterized in that also being provided with synchronous error monitoring loop.
the distributed optical fiber temperature sensor of high resolving power described in the utility model, the output terminal that it is characterized in that pulse optical fiber is connected with wavelength division multiplexer, the output terminal of wavelength division multiplexer is connected with the 1*2 fiber coupler, the two-way output terminal of 1*2 fiber coupler respectively with the calibration optical fiber, the input end of pulsed light electric transducer is connected, the output terminal of wherein calibrating optical fiber is connected with sensor fibre, the output terminal of pulsed light electric transducer is connected with data collecting card, after processing, wavelength division multiplexer obtained the Stokes light signal by the backscattering light signal that returns in sensor fibre, the anti-Stokes light signal is received by the two-way photoelectricity receiver module that is connected with wavelength division multiplexer respectively, the output terminal of two-way photoelectricity receiver module is connected with data collecting card respectively, the output terminal of data collecting card is connected with pulse optical fiber.
Be provided with the synchronous error Monitoring Data Acquisition Circuit that input end is connected with pulsed light electric transducer output terminal described in the utility model in data collecting card,
The error calculation circuit that is connected with synchronous error Monitoring Data Acquisition Circuit,
And be connected with error calculation circuit be used for judging whether to carry out the cumulative decision circuit of light signal dorsad;
Be provided with the optical signal receiving circuit dorsad that is connected with the output terminal of two-way photoelectricity receiver module with input end,
The accumulation process circuit that is connected with optical signal receiving circuit dorsad,
The result of light signal dorsad of being used for that is connected with the accumulation process circuit is uploaded to the circuit of uploading of industrial computer;
Also be provided with for to pulse optical fiber, sending the fixedly pulsed triggering circuit of the pulse signal of repetition frequency,
Be used for wherein determining whether that the output terminal that carries out the cumulative decision circuit of light signal dorsad is connected with the accumulation process circuit,
The output terminal of pulsed triggering circuit is connected with the trigger pip input end of pulse optical fiber, and pulsed triggering circuit also is connected with error calculation circuit.
The electric transducer of pulsed light described in the utility model, the Pin pipe or APD, high-pressure modular and the discharge circuit that are 1550nm by wavelength form, the output terminal of high-pressure modular is connected with the input end of Pin pipe or APD, the output terminal of Pin pipe or APD is connected with the output terminal of discharge circuit, high-pressure modular is managed for Pin or APD provides reverse bias, realize the conversion of light signal to electric signal, discharge circuit is realized the adjustment of electric signal.
in the utility model, the 1*2 fiber coupler is used for being sent by pulse optical fiber, light signal after wavelength division multiplexer is processed is divided into two-way, wherein a road light signal is sent into calibration optical fiber successively, carry out thermometric in sensor fibre, another road light signal is admitted in synchronous error monitoring loop and carries out the error Simultaneous Monitoring, wherein 1*2 fiber coupler light that pulse optical fiber is sent is divided into 90:10 two-way light, wherein 90% light enters calibration optical fiber and reaches the sensor fibre that is connected with calibration optical fiber, 10% light enters after the pulsed light electric transducer and converts electric impulse signal to and send into data collecting card, the back scattering Raman light that produces in sensor fibre is divided into Stokes and anti-Stokes light through wavelength division multiplexer, respectively with receive the photoelectricity receiver module of Raman anti-Stokes and stokes scattering signal dorsad and be connected, the output terminal of photoelectricity receiver module is connected with the input end of data acquisition circuit in data collecting card, the output terminal of data collecting card is connected with pulse optical fiber, synchronous error monitoring loop described in the utility model, by the 1*2 fiber coupler, pulsed light electric transducer and data collecting card form, the light 10% of 1*2 fiber coupler com end output enters the pulsed light electric transducer, converted after electric impulse signal to the synchronous error Monitoring Data Acquisition Circuit of sending in data collecting card by the pulsed light electric transducer, by the time interval between the error calculation circuit accurate Calculation laser pulse trigger pip that is connected with synchronous error Monitoring Data Acquisition Circuit in data collecting card and electric impulse signal rising edge, determine whether accordingly light signal is dorsad carried out accumulation process, and according to the accumulation process circuit that result of determination is controlled in data collecting card, work accordingly.
A kind of high resolving power distributed fiber temperature measuring device, comprise industrial computer, optical fiber Raman temperature sensor, data collecting card in optical fiber Raman temperature sensor is connected with industrial computer, the 2 tunnel Raman scattering signals that data collecting card will receive are uploaded to industrial computer through usb bus, it is characterized in that described optical fiber Raman temperature sensor adopts the distributed optical fiber temperature sensor that is applicable to high spatial resolution as above.
High resolving power distributed fiber temperature measuring device described in the utility model, pulse optical fiber, centre wavelength can be 1550nm, pulse width 5ns, repetition frequency 10KHz, peak power 20W; The 1*2 fiber coupler, corresponding centre wavelength is 1550nm, splitting ratio is 90:10, insertion loss＜0.7dB; Corresponding wavelength division multiplexer consists of the anti Stokes scattering of the Raman dorsad light wideband filtered sheet of centre wavelength 1450nm, the Stokes ratio of Raman dorsad wideband filtered sheet and the Rayleigh scattered light filter plate of centre wavelength 1660nm; Data collecting card, sampling rate are 200MSPS, and the analog input channel number is that 2, ADC precision is 12bits.
Data collecting card described in the utility model, have precise time interval measurement, Raman scattering signals collecting dorsad and the function such as cumulative, accurate time interval of specified data capture card trigger collection signal and the electric impulse signal rising edge changed after the pulsed light electric transducer, and with the spatial resolution error range parameter of host computer, compare, thereby determine that whether this being triggered periodic signal carries out accumulation process, guarantees that final spatial resolution is in error range.
in the utility model, data collecting card has the decision-making function whether periodic signal is added up, realized high spatial resolution, overcome present stage in the situation that the certain spatial resolution broadening problem that causes due to the problem such as synchronous of periodic signal of laser pulse width, the utility model is by adopting the 1*2 fiber coupler, the synchronous error monitoring scheme that pulsed light electric transducer and data collecting card form, reduced the impact of the stationary problem of periodic signal on the spatial resolution broadening of optical fiber sensing, the dependence of reduction to the narrow pulse width laser device of costliness, simultaneously, can carry out restricted setting to final because of the spatial resolution broadening that synchronously causes according to actual conditions.
Description of drawings:
Accompanying drawing 1 is the structural representation of the utility model middle high-resolution distributed optical fiber temperature sensor.
Accompanying drawing 2 is structural representations of the utility model middle high-resolution distributed fiber temperature measuring device.
Accompanying drawing 3 is in prior art, the pulse width broadening schematic diagram under the pulse width of 5 different cycles.
Accompanying drawing 5 is structured flowcharts of data collecting card in the utility model.
Reference numeral: pulse optical fiber 1, wavelength division multiplexer 2,1*2 fiber coupler 3, pulsed light electric transducer 4, calibration optical fiber 5, sensor fibre 6, photoelectricity receiver module 7, photoelectricity receiver module 8, data collecting card 9, industrial computer 10, synchronous error Monitoring Data Acquisition Circuit 11, error calculation circuit 12, decision circuit 13, dorsad optical signal receiving circuit 14, accumulation process circuit 15, upload circuit 16, pulsed triggering circuit 17.
Embodiment:
Below in conjunction with drawings and Examples, the utility model is further described.
as shown in Figure 1, the utility model proposes a kind of distributed optical fiber temperature sensor that is applicable to high spatial resolution, comprise pulse optical fiber 1, wavelength division multiplexer 2, 1*2 fiber coupler 3, pulsed light electric transducer 4, calibration optical fiber 5, sensor fibre 6, photoelectricity receiver module 7, photoelectricity receiver module 8, data collecting card 9, pulsed laser 1 is connected with data collecting card 9, wherein be provided with synchronous error monitoring loop, the light that pulse optical fiber sends enters the 1*2 fiber coupler after wavelength division multiplexer com end, and be divided into the two-way light of 90:10 by the 1*2 fiber coupler, 90% light enters calibration optical fiber and follow-up sensor fibre, 10% light enters after the pulsed light electric transducer and converts electric impulse signal to and send into data collecting card, wherein as shown in Figure 5, be provided with the synchronous error Monitoring Data Acquisition Circuit 11 that input end is connected with pulsed light electric transducer output terminal in described data collecting card, the error calculation circuit 12 that is connected with synchronous error Monitoring Data Acquisition Circuit 11, and be connected with error calculation circuit 12 be used for judging whether to carry out the cumulative decision circuit 13 of light signal dorsad, also be provided with the optical signal receiving circuit dorsad 14 that is connected with the output terminal of two-way photoelectricity receiver module with input end, the accumulation process circuit 15 that is connected with optical signal receiving circuit 14 dorsad, what being used for of being connected with accumulation process circuit 15, the result of light signal dorsad was uploaded to industrial computer uploads circuit 16, also be provided with for to pulse optical fiber 1, sending the fixedly pulsed triggering circuit 17 of the pulse signal of repetition frequency, be used for wherein determining whether that the output terminal that carries out the cumulative decision circuit 13 of light signal dorsad is connected with accumulation process circuit 15, the output terminal of pulsed triggering circuit 17 is connected with the trigger pip input end of pulse optical fiber 1, and pulsed triggering circuit 17 also is connected with error calculation circuit 12.
As shown in Figure 2, the utility model also proposes a kind of distributed fiber temperature measuring device that is applicable to high spatial resolution, comprise industrial computer 10 and optical fiber Raman temperature sensor, data collecting card 9 in optical fiber Raman temperature sensor is connected with industrial computer 10, the 2 tunnel Raman scattering signals that data collecting card 9 will receive are uploaded to industrial computer 10 through usb bus, and wherein said optical fiber Raman temperature sensor adopts above-mentioned a kind of distributed optical fiber temperature sensor that is applicable to high spatial resolution.
Accompanying drawing 3 is not for adopting spatial resolution broadening schematic diagram of the present utility model, wherein, (a) be the pulse width schematic diagram of 5 different cycles, be respectively the cycle 1-cycle 5, in the situation that do not adopt technical solutions of the utility model, data collecting card all adds up to by the cycle 1-cycle 5, triggering the data that obtain, and cumulative afterpulse width broadening signal as shown in (b) in accompanying drawing 3, can find out that not adopting broadening in situation of the present utility model be 30%.
accompanying drawing 4 is for adopting spatial resolution broadening of the present utility model to improve schematic diagram, wherein, (a) be the pulse width schematic diagram of 5 different cycles, be respectively the cycle 1-cycle 5, adopt in the situation of technical solutions of the utility model, synchronous error Monitoring Data Acquisition Circuit in synchronous error monitoring loop is obtained the electric pulse of pulsed light electric transducer 4 outputs in detection loop, and the data that will collect are sent into error calculation circuit, calculate the time interval of laser pulse trigger pip and the electric impulse signal rising edge after the conversion of pulsed light electric transducer, and result of calculation and spatial resolution error range parameter are compared, when comparative result less than error threshold, decision is carried out accumulation process to the data through this periodic signal triggering acquisition that the optical signal receiving circuit dorsad in the data capture card receives, when comparative result greater than error threshold, decision is not carried out accumulation process to the data through this periodic signal triggering acquisition that the optical signal receiving circuit dorsad in the data capture card receives, cycle 1 in figure, cycle 3, the trigger pip in cycle 5 meets the requirements, therefore to the cycle 1, cycle 3, the data that cycle 5 three groups of trigger pips obtain are carried out accumulation process, result is as shown in figure (b), can find out that the spatial resolution broadening is 10%, with accompanying drawing 3(b) do not adopt method of the present utility model to improve 20%.
Embodiment:
a kind of distributed fiber temperature measuring device that is applicable to high spatial resolution, as shown in Figure 2, comprise pulse optical fiber 1, wavelength division multiplexer 2, 1*2 fiber coupler 3, pulsed light electric transducer 4, calibration optical fiber 5, sensor fibre 6, photoelectricity receiver module 7, photoelectricity receiver module 8, data collecting card 9, and industrial computer 10, wherein a road output terminal of data collecting card 9 is connected with the input end of pulse optical fiber 1, the 1550nm pulsed light of pulse optical fiber 1 output is connected with the 1550nm input end of wavelength division multiplexer 2, the com output terminal of wavelength division multiplexer 2 is connected with the input end of 1*2 fiber coupler 3, 90% minute light output end of 1*2 fiber coupler 3 is connected with an end of calibration optical fiber 5, the other end of calibration optical fiber 5 is connected with sensor fibre 6, the anti-Stokes of Raman dorsad that calibration optical fiber 5 and sensor fibre 6 produce and stokes scattering signal divide from the 1450nm of wavelength division multiplexer 2 and the output of 1660nm output port, and respectively at photoelectricity receiver module 7, the input end of photoelectricity receiver module 8 is connected, another road output terminal of 1*2 fiber coupler 3 is connected with the input end of pulsed light electric transducer 4, the output terminal of pulsed light electric transducer 4 is connected with a road input end of data collecting card 9, another road output terminal of data collecting card 9 is connected with industrial computer 10, wherein said pulse optical fiber, centre wavelength is 1550nm, pulse width 5ns, repetition frequency 10KHz, peak power 20W, described 1*2 fiber coupler, centre wavelength 1550nm, splitting ratio is 90:10, insertion loss＜0.7dB, described wavelength division multiplexer is by the anti Stokes scattering of the Raman dorsad light wideband filtered sheet of centre wavelength 1450nm, the Stokes ratio of the Raman dorsad wideband filtered sheet of centre wavelength 1660nm and Rayleigh scattered light filter plate form, described data collecting card, sampling rate is 200MSPS, the analog input channel number is 2, the ADC precision is 12bits.
a kind of distributed optical fiber temperature sensor that is applicable to high spatial resolution that the utility model provides, adopt the 1*2 fiber coupler, pulsed light electric transducer and data collecting card have been realized the Accurate Measurement to synchronous error, reduced because of the impact on spatial resolution broadening problem of the synchronous error of periodic signal, the dependence of reduction to the narrow pulse width laser device of costliness, simultaneously, can carry out restricted setting to final because of the spatial resolution broadening that synchronously causes according to actual conditions, the utility model is than other present distributed optical fiber Raman temperature sensor, has significant advantage in the situation that do not affect other index on the spatial resolution index.
Claims (8)
1. high resolving power distributed optical fiber temperature sensor, be provided with by pulse optical fiber, wavelength division multiplexer, calibration optical fiber, sensor fibre, the photoelectricity receiver module, the thermometric loop that data collecting card forms, it is characterized in that also being provided with synchronous error monitoring loop, the output terminal of pulse optical fiber is connected with wavelength division multiplexer, the output terminal of wavelength division multiplexer is connected with the 1*2 fiber coupler, the two-way output terminal of 1*2 fiber coupler respectively with the calibration optical fiber, the input end of pulsed light electric transducer is connected, the output terminal of wherein calibrating optical fiber is connected with sensor fibre, the output terminal of pulsed light electric transducer is connected with data collecting card, after processing, wavelength division multiplexer obtained the Stokes light signal by the backscattering light signal that returns in sensor fibre, the anti-Stokes light signal is received by the two-way photoelectricity receiver module that is connected with wavelength division multiplexer respectively, the output terminal of two-way photoelectricity receiver module is connected with data collecting card respectively, the output terminal of data collecting card is connected with pulse optical fiber.
2. a kind of high resolving power distributed optical fiber temperature sensor according to claim 1, is characterized in that in described data collecting card being provided with the synchronous error Monitoring Data Acquisition Circuit that input end is connected with pulsed light electric transducer output terminal,
The error calculation circuit that is connected with synchronous error Monitoring Data Acquisition Circuit,
And be connected with error calculation circuit be used for judging whether to carry out the cumulative decision circuit of light signal dorsad;
Be provided with the optical signal receiving circuit dorsad that is connected with the output terminal of two-way photoelectricity receiver module with input end,
The accumulation process circuit that is connected with optical signal receiving circuit dorsad,
The result of light signal dorsad of being used for that is connected with the accumulation process circuit is uploaded to the circuit of uploading of industrial computer;
Also be provided with for to pulse optical fiber, sending the fixedly pulsed triggering circuit of repetition frequency,
Be used for wherein determining whether that the output terminal that carries out the cumulative decision circuit of light signal dorsad is connected with the accumulation process circuit,
The output terminal of pulsed triggering circuit is connected with the trigger pip input end of pulse optical fiber, and pulsed triggering circuit also is connected with error calculation circuit.
3. a kind of high resolving power distributed optical fiber temperature sensor according to claim 1, it is characterized in that described pulsed light electric transducer, the Pin pipe or APD, high-pressure modular and the discharge circuit that are 1550nm by wavelength form, the output terminal of high-pressure modular is connected with the input end of Pin pipe or APD, and the output terminal of Pin pipe or APD is connected with the output terminal of discharge circuit.
4. high resolving power distributed fiber temperature measuring device, comprise industrial computer, optical fiber Raman temperature sensor, data collecting card in optical fiber Raman temperature sensor is connected with industrial computer, the 2 tunnel Raman scattering signals that data collecting card will receive are uploaded to industrial computer through usb bus, it is characterized in that described optical fiber Raman temperature sensor adopts high resolving power distributed optical fiber temperature sensor as described in any one in claim 1-3.
5. high resolving power distributed fiber temperature measuring device according to claim 4, is characterized in that described pulse optical fiber, and centre wavelength is 1550nm, pulse width 5ns, repetition frequency 10KHz, peak power 20W.
6. high resolving power distributed fiber temperature measuring device according to claim 4, is characterized in that described 1*2 fiber coupler, and centre wavelength 1550nm, splitting ratio are 90:10, insertion loss＜0.7dB.
7. high resolving power distributed fiber temperature measuring device according to claim 5, is characterized in that described wavelength division multiplexer consists of the anti Stokes scattering of the Raman dorsad light wideband filtered sheet of centre wavelength 1450nm, the Stokes ratio of Raman dorsad wideband filtered sheet and the Rayleigh scattered light filter plate of centre wavelength 1660nm.
8. high resolving power distributed fiber temperature measuring device according to claim 5, is characterized in that described data collecting card, and sampling rate is 200MSPS, and the analog input channel number is that 2, ADC precision is 12bits.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103292928A (en) * | 2013-05-31 | 2013-09-11 | 威海北洋电气集团股份有限公司 | High-resolution distributed optical fiber temperature sensor, temperature measuring device and application method of high-resolution distributed optical fiber temperature sensor and temperature measuring device |
| CN104390724A (en) * | 2014-12-10 | 2015-03-04 | 杭州欧忆光电科技有限公司 | Temperature measurement device of floating roof oil tank |
| CN107990998A (en) * | 2017-11-27 | 2018-05-04 | 南京南瑞继保电气有限公司 | A kind of multichannel distributed fiber temperature measuring device and method |
-
2013
- 2013-05-31 CN CN2013203089696U patent/CN203298893U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103292928A (en) * | 2013-05-31 | 2013-09-11 | 威海北洋电气集团股份有限公司 | High-resolution distributed optical fiber temperature sensor, temperature measuring device and application method of high-resolution distributed optical fiber temperature sensor and temperature measuring device |
| CN103292928B (en) * | 2013-05-31 | 2016-12-28 | 威海北洋电气集团股份有限公司 | High-resolution distributed optical fiber temperature sensor and temperature measuring equipment and using method |
| CN104390724A (en) * | 2014-12-10 | 2015-03-04 | 杭州欧忆光电科技有限公司 | Temperature measurement device of floating roof oil tank |
| CN107990998A (en) * | 2017-11-27 | 2018-05-04 | 南京南瑞继保电气有限公司 | A kind of multichannel distributed fiber temperature measuring device and method |
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