CN203595563U - Temperature fluctuation controllable distributed fiber sensor and temperature fluctuation controllable distributed fiber temperature measuring device - Google Patents
Temperature fluctuation controllable distributed fiber sensor and temperature fluctuation controllable distributed fiber temperature measuring device Download PDFInfo
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- CN203595563U CN203595563U CN201320755625.XU CN201320755625U CN203595563U CN 203595563 U CN203595563 U CN 203595563U CN 201320755625 U CN201320755625 U CN 201320755625U CN 203595563 U CN203595563 U CN 203595563U
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- 239000013307 optical fiber Substances 0.000 claims description 42
- 238000001069 Raman spectroscopy Methods 0.000 claims description 29
- 230000005622 photoelectricity Effects 0.000 claims description 12
- 230000001186 cumulative effect Effects 0.000 claims description 10
- 238000012546 transfer Methods 0.000 claims description 3
- 238000012937 correction Methods 0.000 abstract description 4
- 230000000717 retained effect Effects 0.000 abstract description 3
- 238000009529 body temperature measurement Methods 0.000 abstract description 2
- 238000006243 chemical reaction Methods 0.000 description 4
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Abstract
The utility model relates to the technical field of fiber temperature measurement, and specifically relates to a temperature fluctuation controllable distributed fiber sensor and a temperature fluctuation controllable distributed fiber temperature measuring device, both of whom can improve the correction accuracy of a middle portion of a sensing fiber and retain fluctuation indexes of the two ends of the sensing fiber. The temperature fluctuation controllable distributed fiber sensor is characterized in that the light emitted by a pulsed fiber laser goes into a 1*2 optical switch through the com end of a wavelength division multiplexer, the double-path output ends of the 1*2 optical switch are respectively connected with the two ends of the sensing fiber, photoelectric receiving modules are connected with the back signal output end of the wavelength division multiplexer, the control signal output end of one path of a data acquisition card is connected with the pulsed fiber laser, the control signal output end of the other path of the data acquisition card is connected with the 1*2 optical switch, and the signal output ends of the photoelectric receiving modules are connected with the data acquisition end of the data acquisition card. According to utility model, compared with the prior art, a correction operation can be carried out on the middle portion of the fiber, and the fluctuation indexes of the two ends of the fiber are retained, so that a system is of controllable temperature fluctuation.
Description
Technical field
The utility model relates to Fiber Optic Pyrometer field, a kind of correction accuracy that can improve sensor fibre interlude specifically, and retain controlled distributed fiberoptic sensor and the temperature measuring equipment of temperature fluctuation of the fluctuation index at sensor fibre two ends.
Background technology
As everyone knows, distributed optical fiber temperature sensor is a kind of optical fiber sensing system for real-time measurement space temperature field that development in recent years is got up, this system utilizes Raman scattering effect and OTDR technology to realize the distributed measurement to sensitive optical fibre temperature field of living in, compared 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, high precision at present, and high precision is exactly high-temperature fluctuation degree, high spatial resolution, spatial resolution is determined by laser pulse width, can solve by the laser of burst pulse; Realize long distance and high-temperature fluctuation degree, the high signal to noise ratio (S/N ratio) of final pursuit, the temperature fluctuation of current common distributed optical fiber temperature sensor increases along with the increase of measuring distance, and the temperature fluctuation that is also system nominal measuring distance place is exactly the nominal temperature fluctuation degree of system.
Within 2011, Italian Soto team has announced its up-to-date development " High-Performance Raman-Based Distributed Fiber-Optic Sensing Under a Loop Scheme Using Anti-Stokes Light Only ", there is the single channel anti-Stokes Raman fiber sensor-based system of both-end correcting scheme, although this research has good calibration result to loss etc., in the middle of still existing, temperature fluctuation is better than the feature at two ends.
Summary of the invention
The utility model is for the shortcoming and defect existing in prior art, propose a kind of in optical fiber temperature-measurement device, the effectively correction accuracy of sensor fibre interlude, and retain controlled distributed fiberoptic sensor and the temperature measuring equipment of temperature fluctuation of the fluctuation index at sensor fibre two ends.
The utility model can reach by following measures:
The distributed optical fiber temperature sensor that a kind of temperature fluctuation is controlled, comprise pulse optical fiber, wavelength division multiplexer, 1*2 photoswitch, sensor fibre, photoelectricity receiver module and data collecting card, it is characterized in that the light that pulse optical fiber sends enters 1*2 photoswitch through wavelength division multiplexer com end, the two-way output terminal of 1*2 photoswitch is connected with the two ends of sensor fibre respectively, photoelectricity receiver module is connected with the signal output part dorsad of wavelength division multiplexer, data collecting card Yi road control signal output terminal is connected with pulse optical fiber, another road control signal output terminal of data collecting card is connected with 1*2 photoswitch, the signal output part of photoelectricity receiver module is connected with the data acquisition end of data collecting card.
In the utility model, in data collecting card, be provided with photoswitch channel control circuit, pulse optical fiber control circuit, Raman scattering signals collecting dorsad and summation circuit and cumulative data are uploaded circuit, control for the output optical signal of realizing paired pulses fiber laser, the duty of 1*2 photoswitch is controlled simultaneously, and autonomous cumulative operation of realizing the light signal of Raman scattering dorsad to forward or reverse transfer light according to the selection of the different passages of 1*2 photoswitch, the photoswitch channel control circuit of the utility model data collecting card utilizes its FPGA to form the required control signal of digital circuit photoswitch of phase inverter or string conversion, realize by 0 and 1 logic sequence forming, and control the channel selecting of photoswitch by it, pulse optical fiber control circuit is realized the periodic signal of fixed frequency and dutycycle by the frequency locking device PLL frequency division of FPGA, Raman scattering signal acquisition circuit is by one-level amplifier dorsad, ADC adjusts difference channel and ADC forms, summation circuit is by direction determining circuit, the formations such as table tennis summation circuit, cumulative upload circuit and realized by protocol conversion circuitry and USB2.0 hardware environment.
The distributed fiber temperature measuring device that a kind of temperature fluctuation is controlled, be provided with industrial computer and the optical fiber Raman temperature sensor being connected with industrial computer, it is characterized in that described optical fiber Raman temperature sensor is above-mentioned optical fiber Raman temperature sensor, the data collecting card in optical fiber Raman temperature sensor is connected with industrial computer through usb bus.
The utility model in use, adopt double-end measurement and the Raman scattering principle based on anti-Stokes demodulation Stokes curve, realize the correct operation of optical fiber interlude, retained the fluctuation degree index at optical fiber two ends simultaneously, adjust the opereating specification of interlude by software, make system there is controllable temperature fluctuation degree.
accompanying drawing explanation:
Accompanying drawing 1 is the structured flowchart of distributed fiberoptic sensor in the utility model.
Accompanying drawing 2 is structured flowcharts of distributed fiber temperature measuring device in the utility model.
Reference numeral: pulse optical fiber 1, wavelength division multiplexer 2,1*2 photoswitch 3, sensor fibre 4, photoelectricity receiver module 5, data collecting card 6, photoswitch channel control circuit 7, pulse optical fiber control circuit 8, Raman scattering signals collecting dorsad and summation circuit 9, cumulative data are uploaded circuit 10, industrial computer 11.
embodiment:
Below in conjunction with accompanying drawing and concrete enforcement, the utility model is further described.
As shown in Figure 1, the utility model proposes the controlled distributed fiberoptic sensor of a kind of temperature fluctuation and temperature measuring equipment and method, comprise pulse optical fiber 1, wavelength division multiplexer 2, 1*2 photoswitch 3, sensor fibre 4, photoelectricity receiver module 5 and data collecting card 6, it is characterized in that the light that pulse optical fiber 1 sends enters 1*2 photoswitch 3 through the com of wavelength division multiplexer 2 end, the two-way output terminal of 1*2 photoswitch 3 is connected with the two ends of sensor fibre 4 respectively, photoelectricity receiver module 5 is connected with the signal output part dorsad of wavelength division multiplexer 2, data collecting card 6 Yi road control signal output terminals are connected with pulse optical fiber 1, another road control signal output terminal of data collecting card 6 is connected with 1*2 photoswitch 3, the signal output part of photoelectricity receiver module 5 is connected with the data acquisition end of data collecting card 6, wherein be provided with two photoelectricity receiver modules 5, two photoelectricity receiver modules 5 respectively with the light output end of Stokes dorsad of wavelength division multiplexer 2, anti-Stokes light output end is connected dorsad.
The centre wavelength of the light signal that pulse optical fiber 1 described in the utility model is exported is 1550nm, pulse width is 5ns, repetition frequency is 10KHz, peak power is 20W, the centre wavelength of described 1*2 photoswitch work is 1550nm, insertion loss < 0.6dB, the backward Raman anti Stokes scattering light wideband filtered sheet that described wavelength division multiplexer is 1450nm by centre wavelength, centre wavelength is that backward Raman Stokes ratio wideband filtered sheet and the Rayleigh scattered light filter plate of 1660nm forms, the sampling rate of described data collecting card is 200MSPS, analog input channel number >=2, ADC precision is 12bits.
In data collecting card 6 described in the utility model, be provided with photoswitch channel control circuit 7, pulse optical fiber control circuit 8, Raman scattering signals collecting dorsad and summation circuit 9 and cumulative data and upload circuit 10, control for the output optical signal of realizing paired pulses fiber laser 1, the duty of 1*2 photoswitch 3 is controlled simultaneously, and realized the autonomous cumulative operation of the light signal of Raman scattering dorsad to forward or reverse transfer light according to the selection of the different passages of 1*2 photoswitch 3.
Wherein, photoswitch channel control circuit 7 in data collecting card 6, pulse optical fiber control circuit 8, Raman scattering signals collecting dorsad and summation circuit 9 and cumulative data are uploaded circuit 10, formed by following structure respectively: the photoswitch channel control circuit of the utility model data collecting card utilizes its FPGA to form the required control signal of digital circuit photoswitch of phase inverter or string conversion, realize by 0 and 1 logic sequence forming, and control the channel selecting of photoswitch by it, pulse optical fiber control circuit is realized the periodic signal of fixed frequency and dutycycle by the frequency locking device PLL frequency division of FPGA, Raman scattering signal acquisition circuit is by one-level amplifier dorsad, ADC adjusts difference channel and ADC forms, summation circuit is by direction determining circuit, the formations such as table tennis summation circuit, cumulative upload circuit and realized by protocol conversion circuitry and USB2.0 hardware environment.
As shown in Figure 2, the utility model also proposes the controlled distributed fiber temperature measuring device of a kind of temperature fluctuation, be provided with industrial computer 11 and the optical fiber Raman temperature sensor being connected with industrial computer 11, it is characterized in that described optical fiber Raman temperature sensor is above-mentioned optical fiber Raman temperature sensor, the data collecting card 6 in optical fiber Raman temperature sensor is connected with industrial computer 11 through usb bus.
The utility model in use, adopt double-end measurement and the Raman scattering principle based on anti-Stokes demodulation Stokes curve, can realize the correct operation to optical fiber interlude, retained the fluctuation degree index at optical fiber two ends simultaneously, adjust the opereating specification of interlude by software, make system there is controllable temperature fluctuation degree.
Claims (3)
1. the distributed fiberoptic sensor that temperature fluctuation is controlled, comprise pulse optical fiber, wavelength division multiplexer, 1*2 photoswitch, sensor fibre, photoelectricity receiver module and data collecting card, it is characterized in that the light that pulse optical fiber sends enters 1*2 photoswitch through wavelength division multiplexer com end, the two-way output terminal of 1*2 photoswitch is connected with the two ends of sensor fibre respectively, photoelectricity receiver module is connected with the signal output part dorsad of wavelength division multiplexer, data collecting card Yi road control signal output terminal is connected with pulse optical fiber, another road control signal output terminal of data collecting card is connected with 1*2 photoswitch, the signal output part of photoelectricity receiver module is connected with the data acquisition end of data collecting card.
2. the controlled distributed fiberoptic sensor of a kind of temperature fluctuation according to claim 1, it is characterized in that being provided with in data collecting card photoswitch channel control circuit, pulse optical fiber control circuit, Raman scattering signals collecting dorsad and summation circuit and cumulative data are uploaded circuit, control for the output optical signal of realizing paired pulses fiber laser, the duty of 1*2 photoswitch is controlled simultaneously, and autonomous cumulative operation of realizing the light signal of Raman scattering dorsad to forward or reverse transfer light according to the selection of the different passages of 1*2 photoswitch.
3. the distributed fiber temperature measuring device that temperature fluctuation is controlled, be provided with industrial computer and the optical fiber Raman temperature sensor being connected with industrial computer, it is characterized in that described optical fiber Raman temperature sensor is optical fiber Raman temperature sensor claimed in claim 2, the data collecting card in optical fiber Raman temperature sensor is connected with industrial computer through usb bus.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320755625.XU CN203595563U (en) | 2013-11-27 | 2013-11-27 | Temperature fluctuation controllable distributed fiber sensor and temperature fluctuation controllable distributed fiber temperature measuring device |
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| CN201320755625.XU CN203595563U (en) | 2013-11-27 | 2013-11-27 | Temperature fluctuation controllable distributed fiber sensor and temperature fluctuation controllable distributed fiber temperature measuring device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103575424A (en) * | 2013-11-27 | 2014-02-12 | 威海北洋电气集团股份有限公司 | Temperature fluctuation controllable distributed fiber sensor as well as temperature measuring system and method |
| CN110455432A (en) * | 2018-05-08 | 2019-11-15 | 河北亿邦医疗设备股份有限公司 | A kind of temperature measuring equipment |
-
2013
- 2013-11-27 CN CN201320755625.XU patent/CN203595563U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103575424A (en) * | 2013-11-27 | 2014-02-12 | 威海北洋电气集团股份有限公司 | Temperature fluctuation controllable distributed fiber sensor as well as temperature measuring system and method |
| CN110455432A (en) * | 2018-05-08 | 2019-11-15 | 河北亿邦医疗设备股份有限公司 | A kind of temperature measuring equipment |
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Granted publication date: 20140514 |