CN101344440B - Automatic temperature calibration type distributed optical fiber temperature measurement sensing equipment and its use method - Google Patents
Automatic temperature calibration type distributed optical fiber temperature measurement sensing equipment and its use method Download PDFInfo
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- CN101344440B CN101344440B CN2008100421965A CN200810042196A CN101344440B CN 101344440 B CN101344440 B CN 101344440B CN 2008100421965 A CN2008100421965 A CN 2008100421965A CN 200810042196 A CN200810042196 A CN 200810042196A CN 101344440 B CN101344440 B CN 101344440B
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Abstract
The invention discloses a distributed optical fiber temperature measuring and sensing device with automatic temperature calibration and a use method thereof, and is characterized in that a beam output end of a coupler is connected with a beam input end of a thermotank, and a temperature controlling module is arranged inside the thermotank, which is doubly connected with a data acquisition unit, and compared with traditional optical fiber temperature measuring and sensing devices, the distributed optical fiber temperature measuring and sensing device has the following advantages: 1. the deviceis not required to be returned to factories for measuring and debugging, thus saving resources and funds; 2. the device realizes self calibration, thus maintaining continuously precise measurement for a long time; 3. the accuracy and precision of temperature calibration is greatly improved; 4. the time and number of the project operation and cease are greatly reduced.
Description
Technical field:
The present invention relates to the distributed fiber temperature sensing apparatus technology, a kind of specifically automatic temperature calibration type distributed optical fiber temperature measurement sensing equipment and method of application thereof, 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 the loudspeaker diffuse spectrum is responsive to temperature, through coupling mechanism and optical splitter the loudspeaker diffuse spectrum in the rear orientation light is separated, and passes 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 receives 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 with not enough as follows:
1, because it is a mean value of repeatedly measuring temperature through thermocouple sensor, accuracy and degree of accuracy person are 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 be further improved.
Summary of the invention:
The object of the present invention is to provide a kind of automatic temperature calibration type distributed optical fiber temperature measurement sensing equipment and method of application thereof, this device need not returned producer and measure debugging, and the system that also can not influence continues good operation.Only need one section of the initiating terminal of detection optical fiber as a reference optical fiber put into the constant temperature oven that temperature control modules (TEC) is housed; 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, technical scheme of the present invention is: a kind of automatic temperature calibration type distributed optical fiber temperature measurement sensing equipment, and 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, and the input end of isochronous controller is connected with the output terminal of data processor, and 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, and the output terminal of photodetector is connected with amplifier input terminal, and 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 said coupling mechanism is connected with the light beam input end of constant temperature oven through light beam, is provided with temperature control modules in the constant temperature oven, and constant temperature oven is connected with data processor is two-way.
A kind of temperature survey and scaling method that uses automatic temperature calibration type distributed optical fiber temperature measurement sensing equipment; It is characterized in that: when computing machine transmission temperature monitoring was ordered to data processor, data processor drove isochronous controller and sends synchronizing pulse control laser driver and data acquisition unit synchronous working; Laser driver just begins drive laser work after receiving the synchronizing pulse that isochronous controller sends, and in optical fiber, continuously sends laser; The back can take place to the loudspeaker diffuse scattering in laser when in optical fiber, transmitting, the laser signal that back scattering is returned is coupled device to be separated one the tunnel and come out to be sent to light filter; Light filter will come out the casual separate optical signals of the loudspeaker in the laser signal of sending here; Be sent to photodetector and convert light signal to electric signal; Electric signal is exaggerated and carries out data acquisition by data acquisition unit after device amplifies; The data that collect through data acquisition unit are sent to the data processor overall treatment; After FPGA high-speed data processor data processed is fed to computing machine displays temperature curve, when needing the temperature of caliberating device, computing machine sends calibration command to data processor; The data processor controlled temperature control modules is adjusted to the temperature of demarcation to the temperature in the constant temperature oven, and the corresponding temperature value at constant temperature oven internal reference optical fiber that computing machine shows promptly is adjusted to the value of constant temperature the temperature inside the box.
The invention discloses a kind of automatic temperature calibration type distributed optical fiber temperature measurement sensing equipment and data processing method thereof, it compares the present invention with traditional optical fiber temperature measurement sensing equipment has following advantage and good effect:
1, this device need not returned producer and measure 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 a structural representation of the present invention
Fig. 2 is a principle of work process flow diagram of the present invention
Fig. 3 is a temperature control modules structural representation of the present invention
Embodiment:
With reference to the accompanying drawings, the present invention is further described
The present invention is a kind of automatic temperature calibration type distributed optical fiber temperature measurement sensing equipment; It mainly comprises laser instrument 3, and the input end of laser instrument 3 is connected with the output terminal of laser driver 2, and 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, and the output terminal of coupling mechanism 4 is connected with the input end of light filter 5, and 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, and 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 said coupling mechanism 4 is connected with the light beam input end of constant temperature oven 9 through light beam; Constant temperature oven 9 and 12 two-way connections of data processor are provided with temperature control modules 10 in the constant temperature oven 9.Said temperature control modules 10 is made up 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.
Automatic temperature calibration type distributed optical fiber temperature measurement sensing equipment of the present invention 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, data processor controlled isochronous controller and the data that receive 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 present invention the optical fiber L of an amount of length of the initiating terminal of detecting optical cable as a reference optical fiber put into constant temperature oven by temperature control modules (TEC) control; 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 invention 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 compare than prior art, and the present invention 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 through 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 precision photonics 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) semiconductor chilling plate that to be the C8051F350 single-chip microcomputer that adopts Silicon Laboratories company produce with Shenzhen Dongfang Keyuan Science and Technology Co., Ltd. (can realize from positive temperature 90 ℃ to 130 ℃ of negative temperatures), temperature sensor is that the DS7505 of employing Maxim realizes;
In the specific implementation, described data processor 8 is to adopt the high speed FPGA of ALTERA company to realize;
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>=400MHZ850nm,>=1000MHZ1300nm, attenuation range is≤3.0dB850nm ,≤
0.8dB1300nm
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.
Like Fig. 1, shown in Figure 2, when computing machine 13 transmission temperature monitorings were ordered to data processor 12, data processor 12 drove isochronous controllers 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 in optical fiber, continuously sends laser; The back can take place to the loudspeaker diffuse scattering in laser when in optical fiber, transmitting, 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 invention be indirectly on the calibrated and calculated machine temperature displayed identical with true temperature on the optical fiber, reduced the instrument loss error that produces because of use for a long time; 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 present invention has improved the accuracy and the degree of accuracy of the temperature of demarcation greatly.
Claims (3)
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), and the input end of isochronous controller (1) is connected with the output terminal of data processor (12), and 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), and the output terminal of photodetector (6) is connected with the input end of amplifier (7), and 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 said coupling mechanism (4) is connected with the light beam input end of constant temperature oven (9) through light beam, is provided with temperature control modules (10) in the constant temperature oven (9), constant temperature oven (9) and two-way connection of data processor (12).
2. a kind of automatic temperature calibration type distributed optical fiber temperature measurement sensing equipment according to claim 1; It is characterized in that: said temperature control modules (10) is made up 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.
3. a temperature survey and scaling method that uses automatic temperature calibration type distributed optical fiber temperature measurement sensing equipment; It is characterized in that: when computing machine (13) transmission temperature monitoring was ordered to data processor (12), data processor (12) drove isochronous controller (1) at once and sends synchronizing pulse control laser driver (2) and data acquisition unit (8) synchronous working; Laser driver (2) just begins drive laser (3) work after receiving the synchronizing pulse that isochronous controller (1) sends, and in optical fiber, continuously sends laser; The back can take place to the loudspeaker diffuse scattering in laser when in optical fiber, transmitting, 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 treatment; After FPGA high-speed data processor (12) data processed is fed to computing machine (13) displays temperature curve, 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) is adjusted to the temperature of demarcation to the temperature in the constant temperature oven (9), and 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).
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| CN101893491B (en) * | 2010-03-11 | 2014-10-29 | 上海华魏光纤传感技术有限公司 | Intelligent distributed optical fiber temperature sensing system and working method thereof |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1400453A (en) * | 2001-07-27 | 2003-03-05 | 中国计量学院 | Distributed optical fibre temperature sensor system |
| WO2004029568A1 (en) * | 2002-09-27 | 2004-04-08 | Crc For Intelligent Manufacturing Systems & Technologies Ltd | Distributed temperature sensor using optical reflectometry |
| CN2718542Y (en) * | 2004-06-17 | 2005-08-17 | 广州市亿力电气科技有限公司 | Distributed optical fibre temperature detecting and monitoring apparatus |
| CN2896250Y (en) * | 2006-05-15 | 2007-05-02 | 四川莱威科技有限公司 | Distribution-type optical-fiber temperature sensor |
| CN101162175A (en) * | 2007-11-15 | 2008-04-16 | 中国计量学院 | Ultra-remote distributed fiber raman photons temperature sensor integrated with raman amplifier |
| CN101183032A (en) * | 2007-12-14 | 2008-05-21 | 北京航空航天大学 | Temperature simple calibrating method suitable for reflection-type polarization-preserving fiber temperature sensor |
| CN201247110Y (en) * | 2008-09-01 | 2009-05-27 | 上海华魏自动化设备有限公司 | Automatic temperature calibration type distributed optical fiber temperature measurement sensing equipment |
-
2008
- 2008-08-28 CN CN2008100421965A patent/CN101344440B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1400453A (en) * | 2001-07-27 | 2003-03-05 | 中国计量学院 | Distributed optical fibre temperature sensor system |
| WO2004029568A1 (en) * | 2002-09-27 | 2004-04-08 | Crc For Intelligent Manufacturing Systems & Technologies Ltd | Distributed temperature sensor using optical reflectometry |
| CN2718542Y (en) * | 2004-06-17 | 2005-08-17 | 广州市亿力电气科技有限公司 | Distributed optical fibre temperature detecting and monitoring apparatus |
| CN2896250Y (en) * | 2006-05-15 | 2007-05-02 | 四川莱威科技有限公司 | Distribution-type optical-fiber temperature sensor |
| CN101162175A (en) * | 2007-11-15 | 2008-04-16 | 中国计量学院 | Ultra-remote distributed fiber raman photons temperature sensor integrated with raman amplifier |
| CN101183032A (en) * | 2007-12-14 | 2008-05-21 | 北京航空航天大学 | Temperature simple calibrating method suitable for reflection-type polarization-preserving fiber temperature sensor |
| CN201247110Y (en) * | 2008-09-01 | 2009-05-27 | 上海华魏自动化设备有限公司 | Automatic temperature calibration type distributed optical fiber temperature measurement sensing equipment |
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