CN201247110Y - Automatic temperature calibration type distributed optical fiber temperature measurement sensing equipment - Google Patents
Automatic temperature calibration type distributed optical fiber temperature measurement sensing equipment Download PDFInfo
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- CN201247110Y CN201247110Y CNU2008201525806U CN200820152580U CN201247110Y CN 201247110 Y CN201247110 Y CN 201247110Y CN U2008201525806 U CNU2008201525806 U CN U2008201525806U CN 200820152580 U CN200820152580 U CN 200820152580U CN 201247110 Y CN201247110 Y CN 201247110Y
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Abstract
The utility model discloses an automatic temperature calibration type distributed optical fiber temperature measurement sensing device, which is characterized in that a light beam output end of a coupling is connected with a light beam input end of a constant temperature cabinet through light beams, a temperature control module is arranged in the constant temperature cabinet, the constant temperature cabinet is connected with a data collector in a two-way mode, compared with a traditional optical fiber temperature measurement sensing device, the utility model has the following advantages and active effects that firstly, the device does not need returning back to factories to measure and debug, materials resources and money are saved, secondly, the device can be self-aligned and can maintain continuous accurate measurement for long time, thirdly, the calibrated temperature accuracy and precision are greatly improved, and fourthly, the shutdown time and frequency of project operations are greatly reduced.
Description
Technical field
The utility model relates to the distributed fiber temperature sensing apparatus technology, a kind of specifically automatic temperature calibration type distributed optical fiber temperature measurement sensing equipment, particularly its internal mechanical structure.
Background technology
Optical fibre temperature measurement sensing system is mainly used in industries such as traffic, building, electric power, colliery, petrochemical industry, and its effect is that the real time temperature monitoring is carried out in these important places.It ensures that to normally moving with guaranteeing industrial system equipment the safety of life and property plays an important role.
Existing optical fibre temperature measurement sensing system is made up of laser driver, laser instrument, isochronous controller, coupling mechanism, calibration cell, reference optical fiber, light filter, photoelectric probe, signal amplifier, data acquisition unit and computing machine.Its principle of work is: laser instrument is continuously launched laser in detecting optical cable, back scattering can take place in the transmission course in laser in optical cable, because casual (Raman) spectrum of loudspeaker is responsive to temperature, by coupling mechanism and optical splitter the loudspeaker diffuse spectrum in the rear orientation light is separated, pass through the laggard line data collection of opto-electronic conversion and signal processing and amplifying again, and then the data that collect are sent to the data processor computing machine handle calculating, finally draw temperature data.
In distributed optical fiber temperature sensing system, the demarcation of temperature is a critical step, mainly be to adopt disposable calibration when dispatching from the factory now, make thermocouple sensor repeatedly measure the mean value of temperature and the value of the temperature that Fibre Optical Sensor records is relatively demarcated; But because temperature is subjected to the influence of multiple parameter, along with system's growth of service time, the error of the temperature value on the computing machine on temperature displayed value and the actual fiber can enlarge gradually.Existing way is regularly equipment to be returned producer to detect, calibrate.
The method of existing this temperature calibration to the distributing optical fiber sensing temperature measuring equipment, the defective of existence and not enough as follows:
1, because it is a mean value of repeatedly measuring temperature by thermocouple sensor, accuracy and degree of accuracy are all very little;
2, owing to need the technician to measure and the very big manpower and materials of temperature needs of calibration system, accuracy also can be affected;
Can be to interrupt temperature monitoring when 4, demarcating temperature.
So still need the inner structure of existing distributed fiber temperature sensing equipment is further improved.
Summary of the invention
The purpose of this utility model is to provide a kind of automatic temperature calibration type distributed optical fiber temperature measurement sensing equipment, and this device does not need to return producer and measures debugging, and the system that also can not influence continues good operation.Only need put into the constant temperature oven that temperature control modules (TEC) is housed to a section of the initiating terminal of detection optical fiber as reference optical fiber, and pass through the data processor controlled temperature control modules from computing machine and demarcate temperature, just can keep the long-time good operation of system, overcome the shortcoming and defect shortcoming that exists in the prior art.
To achieve these goals, the technical solution of the utility model is: a kind of automatic temperature calibration type distributed optical fiber temperature measurement sensing equipment, it mainly comprises laser instrument, the input end of laser instrument is connected with the output terminal of laser driver, the input end of laser driver is connected with the output terminal of isochronous controller, the input end of isochronous controller is connected with the output terminal of data processor, the output terminal of laser instrument is connected with the input end of coupling mechanism, the output terminal of coupling mechanism is connected with the input end of light filter, the output terminal of light filter is connected with the input end of photodetector, the output terminal of photodetector is connected with amplifier input terminal, the output terminal of amplifier is connected with the input end of data acquisition unit, the output terminal of data acquisition unit is connected with an input end of data processor, it is characterized in that: the light beam output terminal of described coupling mechanism is connected with the light beam input end of constant temperature oven by light beam, be provided with temperature control modules in the constant temperature oven, constant temperature oven is connected with data acquisition unit is two-way.
The utility model discloses a kind of automatic temperature calibration type distributed optical fiber temperature measurement sensing equipment, it compares the utility model with traditional optical fiber temperature measurement sensing equipment following advantage and good effect:
1, this device does not need to return producer's measurement debugging, saves physical resources and financial resources;
2, device can be kept for a long time measurement accurately continuously by self calibration;
3, the accuracy and the degree of accuracy of the temperature of demarcating have been improved greatly;
4, significantly reduce time and the number of times that the project running is stopped work.
Description of drawings
Fig. 1 is the utility model structural representation.
Fig. 2 is the utility model principle of work process flow diagram.
Fig. 3 is the utility model temperature control modules structural representation.
Embodiment
With reference to the accompanying drawings, the utility model further is described:
The utility model is a kind of automatic temperature calibration type distributed optical fiber temperature measurement sensing equipment, it mainly comprises laser instrument 3, the input end of laser instrument 3 is connected with the output terminal of laser driver 2, the input end of laser driver 2 is connected with the output terminal of isochronous controller 1, the input end of isochronous controller 1 is connected with the output terminal of data processor 12, the output terminal of laser instrument 3 is connected with the input end of coupling mechanism 4, the output terminal of coupling mechanism 4 is connected with the input end of light filter 5, the output terminal of light filter 5 is connected with the input end of photodetector 6, the output terminal of photodetector 6 is connected with the input end of amplifier 7, the output terminal of amplifier 7 is connected with the input end of data acquisition unit 8, the output terminal of data acquisition unit 8 is connected with an input end of data processor 12, it is characterized in that: the light beam output terminal of described coupling mechanism 4 is connected with the light beam input end of constant temperature oven 9 by light beam, constant temperature oven 9 and 8 two-way connections of data acquisition unit are provided with temperature control modules 10 in the constant temperature oven 9.Described temperature control modules 10 is made of single-chip microcomputer 11, temperature sensor 15 and semiconductor chilling plate 14, and wherein, single-chip microcomputer 11 is connected with temperature sensor 15 and semiconductor chilling plate 14 (can realize from positive temperature 90 ℃ to 130 ℃ of negative temperatures) respectively.
The utility model automatic temperature calibration type distributed optical fiber temperature measurement sensing equipment comprises laser instrument, and its control end is connected with laser driver; The backscatter signal of the laser of laser instrument in sensor fibre is coupled device separates one the tunnel and comes out to import into light filter, detector and amplifier, is injected into data acquisition unit; Computing machine connects data processor, the data of data processor controlled isochronous controller and reception data acquisition unit; Three synchronous signal output ends of isochronous controller are connected respectively at laser driver, optical signal detector and data acquisition unit, send synchronizing signal to them and make its synchronous working.The utility model is put into the constant temperature oven of being controlled by temperature control modules (TEC) to the optical fiber L of an amount of length of the initiating terminal of detecting optical cable as reference optical fiber; When data processor was received computing machine and demarcated the order of temperature, the data processor controlled temperature control modules was adjusted to the temperature of demarcation to the temperature in the constant temperature oven, and the corresponding temperature value of the reference optical fiber L that shows on the computing machine promptly is adjusted to temperature value in the constant temperature oven.Because the optical fiber in the constant temperature oven is the part of detecting optical cable, effect of the present utility model is that calibrated and calculated machine temperature displayed is identical with temperature on the actual fiber indirectly, has reduced the instrument loss error that produces because of use for a long time; Simultaneously the temperature curve of reference optical fiber L shows smoothly on computers, the temperature control precision of TEC can reach ± 0.01 ℃, and to compare than prior art, and the utility model has improved the degree of accuracy of the temperature of demarcation greatly.
Wherein computing machine 13 is a peripherals, and other equipment are to be enclosed in the casing, and computing machine carries out communication by data communication interface and data processor and reads internal data, and shows on computers.
In the specific implementation, described isochronous controller 1 is to adopt the CDCE913 synchronous clock circuit module of Texas Instruments to realize;
In the specific implementation, described laser driver 2 is the current drivers that adopt high speed circuit to make, well drive laser emission laser;
In the specific implementation, described laser instrument 3 is semiconductor lasers, can launch laser according to the drive current of Laser Driven;
In the specific implementation, described coupling mechanism 4 is to adopt the y-type optical fiber coupling mechanism, and the laser branch that it returns back scattering is told one the tunnel and passed to light filter;
In the specific implementation, described light filter 5 adopts lens type worry mating plate (can adopt the MI1000-TiD type of precisionphotonics company) to consider light, and unnecessary light is filtered, and only stays the casual light of loudspeaker;
In the specific implementation, described photodetector 6 adopts high sensitivity APD avalanche diode to come exploring laser light, with the casual laser signal switching electrical signals of loudspeaker;
In the specific implementation, described amplifier 7 is the big devices of the high performance computing of OPA365 type that adopt Texas Instruments;
In the specific implementation, described data acquisition unit 8 is the high speed data acquisition systems that adopt Texas Instruments, and travelling speed is 100Mb/s;
In the specific implementation, described temperature control modules 10 (TEC) is to adopt the C8051F350 single-chip microcomputer of Silicon Laboratories company and the semiconductor chilling plate that Shenzhen Dongfang Keyuan Science and Technology Co., Ltd. produces (can realize from positive temperature 90 ℃ to 130 ℃ of negative temperatures), and temperature sensor is to adopt the DS7505 of Maxim to realize;
In the specific implementation, described data processor 8 be adopt ALTERA company tell what FPGA realized;
In the specific implementation, described detecting optical cable 17 is to adopt 62.5/125 μ m multimode optical fiber to add the low smoke and zero halogen oversheath, bandwidth range is 〉=400MHZ@850nm, 〉=1000MHZ@1300nm, attenuation range is≤3.0dB@850nm ,≤
0.8dB@1300nm
In the specific implementation, the used optical fiber of described reference optical fiber 16 and detecting optical cable is identical;
In the specific implementation, described computing machine 13 is general-purpose industrial level computing machines.
As shown in Figure 1 and Figure 2, when computing machine 13 sent the temperature monitoring order to data processor 12, data processor 12 drove isochronous controller 1 and sends synchronizing pulse control laser driver 2 and data acquisition unit 8 synchronous workings; Laser driver 2 just begins drive laser 3 work after receiving the synchronizing pulse that isochronous controller 1 sends, and continuously sends laser in optical fiber; The back can take place to casual (Raman) scattering of loudspeaker in laser when transmitting in optical fiber, the laser signal that back scattering is returned is coupled device 4 separation one tunnel and comes out to be sent to light filter 5; Light filter 5 will come out the casual separate optical signals of the loudspeaker in the laser signal of sending here, be sent to photodetector 6 and convert light signal to electric signal, electric signal is exaggerated and carries out data acquisition by data acquisition unit 8 after device 7 amplifies, the data that collect through data acquisition unit are sent to data processor 12 overall treatments, after FPGA high-speed data processor 12 data processed are fed to computing machine 13 displays temperature curves.
When needing the temperature of caliberating device, computing machine 13 sends calibration command to data processor 12, data processor 12 control temperature control modules 10 are adjusted to the temperature in the constant temperature oven 9 temperature of demarcation, the corresponding temperature value at constant temperature oven 9 internal reference optical fiber 16 that computing machine 13 shows promptly is adjusted to the value of temperature in the constant temperature oven 9, because the reference optical fiber 16 in the constant temperature oven is parts of detecting optical cable 17, effect of the present utility model be indirectly on the calibrated and calculated machine temperature displayed identical with true temperature on the optical fiber, reduced because of the long-term instrument loss error that produces of using; Again because the temperature curve of reference optical fiber L shows smoothly on computers, the temperature control precision of TEC can reach ± 0.01 ℃, and compare than prior art, the utility model has improved the accuracy and the degree of accuracy of the temperature of demarcation greatly.
Claims (2)
1. automatic temperature calibration type distributed optical fiber temperature measurement sensing equipment, it mainly comprises laser instrument (3), the input end of laser instrument (3) is connected with the output terminal of laser driver (2), the input end of laser driver (2) is connected with the output terminal of isochronous controller (1), the input end of isochronous controller (1) is connected with the output terminal of data processor (12), the output terminal of laser instrument (3) is connected with the input end of coupling mechanism (4), the output terminal of coupling mechanism (4) is connected with the input end of light filter (5), the output terminal of light filter (5) is connected with the input end of photodetector (6), the output terminal of photodetector (6) is connected with the input end of amplifier (7), the output terminal of amplifier (7) is connected with the input end of data acquisition unit (8), the output terminal of data acquisition unit (8) is connected with an input end of data processor (12), it is characterized in that: the light beam output terminal of described coupling mechanism (4) is connected by the light beam input end of light beam with constant temperature oven (9), be provided with temperature control modules (10) in the constant temperature oven (9), constant temperature oven (9) and two-way connection of data acquisition unit (8).
2. a kind of automatic temperature calibration type distributed optical fiber temperature measurement sensing equipment according to claim 1, it is characterized in that: described temperature control modules (10) is made of single-chip microcomputer (11), temperature sensor (15) and semiconductor chilling plate (14), wherein, single-chip microcomputer (11) is connected with semiconductor chilling plate (14) with temperature sensor (15) respectively.
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| CNU2008201525806U CN201247110Y (en) | 2008-09-01 | 2008-09-01 | Automatic temperature calibration type distributed optical fiber temperature measurement sensing equipment |
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| CNU2008201525806U CN201247110Y (en) | 2008-09-01 | 2008-09-01 | Automatic temperature calibration type distributed optical fiber temperature measurement sensing equipment |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101813532A (en) * | 2010-03-30 | 2010-08-25 | 中国计量学院 | Temperature field calibrating device and temperature field calibrating method of distributed optical fiber temperature sensor system |
| CN101825498A (en) * | 2010-04-13 | 2010-09-08 | 中国计量学院 | Distributed optical fiber Raman temperature sensor (DOFRTS) with self-correction of dispersion and loss spectra |
| CN101344440B (en) * | 2008-08-28 | 2012-03-21 | 上海华魏自动化设备有限公司 | Automatic temperature calibration type distributed optical fiber temperature measurement sensing equipment and its use method |
| CN106996838A (en) * | 2017-05-27 | 2017-08-01 | 中国电子科技集团公司第四十研究所 | A kind of ROTDR performance indications automatic test and calibration system and method |
-
2008
- 2008-09-01 CN CNU2008201525806U patent/CN201247110Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101344440B (en) * | 2008-08-28 | 2012-03-21 | 上海华魏自动化设备有限公司 | Automatic temperature calibration type distributed optical fiber temperature measurement sensing equipment and its use method |
| CN101813532A (en) * | 2010-03-30 | 2010-08-25 | 中国计量学院 | Temperature field calibrating device and temperature field calibrating method of distributed optical fiber temperature sensor system |
| CN101825498A (en) * | 2010-04-13 | 2010-09-08 | 中国计量学院 | Distributed optical fiber Raman temperature sensor (DOFRTS) with self-correction of dispersion and loss spectra |
| CN106996838A (en) * | 2017-05-27 | 2017-08-01 | 中国电子科技集团公司第四十研究所 | A kind of ROTDR performance indications automatic test and calibration system and method |
| CN106996838B (en) * | 2017-05-27 | 2019-05-24 | 中国电子科技集团公司第四十一研究所 | A kind of ROTDR performance indicator automatic test and calibration system and method |
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Granted publication date: 20090527 Termination date: 20130901 |