CN101344442A - Automatic calibration type distributed optical fiber temperature measurement sensing equipment and its use method - Google Patents
Automatic calibration type distributed optical fiber temperature measurement sensing equipment and its use method Download PDFInfo
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- CN101344442A CN101344442A CNA2008100421984A CN200810042198A CN101344442A CN 101344442 A CN101344442 A CN 101344442A CN A2008100421984 A CNA2008100421984 A CN A2008100421984A CN 200810042198 A CN200810042198 A CN 200810042198A CN 101344442 A CN101344442 A CN 101344442A
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 36
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Abstract
The invention discloses a distributed optical fiber temperature measuring and sensing device with automatic calibration and a use method thereof, and is characterized in that an output end of an optical maser is connected with an input end of a branching unit, an output end of the branching unit is respectively connected with an input end of a coupler and an optical signal detector, an output end of the optical signal detector is connected with an input end of an adjustor, an output end of the adjustor is connected with an input end of a signal amplifier, an output end of an isochronous controller is connected with an input end of the optical signal detector and a data acquisition unit, an input end of the isochronous controller is connected with an output end of a data processor, and an input end of the data processor is connected with an output end of the data acquisition unit. Compared with traditional optical fiber temperature measuring and sensing devices, the distributed optical fiber temperature measuring and sensing device with automatic calibration gain has the following advantages: 1. the device is not required to be returned to factories for measuring and debugging, thus saving resources and funds; 2. the device can maintain continuously precise measurement for a long time; 3. the time and number of the project operation and cease are greatly reduced.
Description
Technical field
The present invention relates to the technical field of distributed fiber temperature sensing, a kind of specifically automatic calibration type distributed optical fiber temperature measurement sensing equipment and using method thereof, particularly its mechanical connecting 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 casual (Raman) spectral separation of the loudspeaker in the rear orientation light is come out, 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 laser instrument light intensity is a very important parameters, but along with the laser instrument growth of service time, the light intensity of laser can weaken gradually, and then can influence the accuracy of temperature measuring equipment; Existing way is regularly equipment to be returned producer to detect, calibrate.So not only needing very big manpower and materials, also can be to interrupt temperature detection.
In sum, still need the structure of existing fiber temperature measurement sensing equipment is further improved.
Summary of the invention
The object of the present invention is to provide a kind of automatic calibration type distributed optical fiber temperature measurement sensing equipment and using method thereof, it improves the device inner structure, has effectively improved the problem that laser intensity weakens and has overcome the shortcoming and defect that the existing fiber temperature measurement sensing system exists.
To achieve these goals, technical scheme of the present invention is: a kind of automatic calibration type distributed optical fiber temperature measurement sensing equipment, it mainly comprises crust of the device, be provided with laser instrument in the crust of the device, 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 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 the input end of signal amplifier, the output terminal of signal amplifier is connected with the input end of data acquisition unit, the coupling mechanism place is provided with optical fiber interface, it is characterized in that: the output terminal of described laser instrument is connected with the input end of shunt, the output terminal of shunt respectively with coupling mechanism, the input end of optical signal detector connects, the output terminal of optical signal detector is connected with the input end of regulator, the output terminal of regulator and signal amplifier another input end be connected, another output terminal of isochronous controller respectively with another input end of optical signal detector, another input end of data acquisition unit connects, the input end of isochronous controller is connected with the output terminal of data processor, and the input end of data processor is connected with the output terminal of data acquisition unit.
A kind of automatic calibration type distributed optical fiber temperature measurement sensing equipment and using method thereof, it is characterized in that: when computing machine sent the beginning measuring command to data processor, data processor drove isochronous controller at once and sends synchronizing pulse requirement laser driver and signal detector and data acquisition unit and start working simultaneously; Laser driver just begins drive laser work after receiving the synchronizing pulse that isochronous controller sends, and continuously sends laser signal in optical fiber; Shunt can go out separation by laser one and be sent to the light signal verifier, is used for checking; Another part Laser Transmission is carried out temperature detection to optical fiber; The back can take place to the loudspeaker diffuse scattering in laser when transmitting in optical fiber, 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 overflow the loudspeaker in the laser signal of sending here separate optical signals and come out, and then sends photoelectric commutator to and convert light signal to electric signal, and then sends electric signal to amplifier and carry out the signal processing and amplifying; The electric signal of crossing through processing and amplifying carries out data acquisition by parallel data acquisition unit, the data that collect through the parallel data acquisition device are sent to the data processor overall treatment, after FPGA high-speed data processor data processed is fed to computing machine displays temperature curve, the incident light of being told by shunt that leads to the signal verification device also can reduce at that time, signal verification device (1 hour-480 hours) at regular intervals will start regulator, regulate No. one time amplifier, make it by self-defined proportional compensation resonance-amplifier, make parallel data acquisition unit in turn carry out data collection task in proper order according to certain.
The invention discloses a kind of automatic calibration type distributed optical fiber temperature measurement sensing equipment and using method thereof, the distributed optical fiber temperature measurement sensing equipment of the automatic calibration-gain of the present invention is compared the present invention with traditional optical fiber temperature measurement sensing equipment following advantage and good effect:
1, this device does not need regular return-to-factory to proofread and correct, and saves physical resources and financial resources;
2, device can be kept for a long time and measure accurately continuously.
3, significantly reduce project running shut down time and number of times.
Description of drawings
Below in conjunction with accompanying drawing and specific embodiments of the invention the present invention is described in further detail:
Fig. 1 is a structural representation of the present invention.
Fig. 2 is a fundamental diagram of the present invention.
Embodiment
With reference to the accompanying drawings, the present invention further is described:
The present invention is a kind of automatic calibration type distributed optical fiber temperature measurement sensing equipment and using method thereof, it mainly comprises crust of the device 14, be provided with laser instrument 3 in the crust of the device 14, 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 output terminal of coupling mechanism 7 is connected with the input end of light filter 8, the output terminal of light filter 8 is connected with the input end of photodetector 9, the output terminal of photodetector 9 is connected with the input end of signal amplifier 10, the output terminal of signal amplifier 10 is connected with the input end of data acquisition unit 11, coupling mechanism 7 places are provided with optical fiber interface 15, it is different from prior art and is: the output terminal of described laser instrument 3 is connected with the input end of shunt 4, the output terminal of shunt 4 respectively with coupling mechanism 7, the input end of optical signal detector 5 connects, the output terminal of optical signal detector 5 is connected with the input end of regulator 6, the output terminal of regulator 6 and signal amplifier 10 another input end be connected, another output terminal of isochronous controller 1 respectively with optical signal detector 5 another input ends, data acquisition unit 11 another input ends connect, the input end of isochronous controller 1 is connected with the output terminal of data processor 12, the input end of data processor 12 is connected with the output terminal of data acquisition unit 11, described data processor 12 and 13 two-way connections of computing machine.
When the concrete enforcement of this device, an end of laser instrument is connected with laser driver; The other end of laser instrument is connected with shunt, the laser that shunt sends laser instrument is divided into the sub-laser of two bundles, wherein one road laser leads to sensor fibre and is used for normally measuring, backscatter signal in the 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; Another road laser is injected in the optical signal detector, optical signal detector regularly detects incident light, when the incident light decay surpasses self-defined standard, optical signal detector starts the regulator pair amplifier to be regulated, and has compensated laser instrument indirectly because of the long-term decay of using the light intensity that produces; Computing machine is connected with data processor, and then the data of control 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.
Wherein computing machine 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 is to adopt the CDCE913 synchronous clock circuit module of Texas Instruments to realize;
In the specific implementation, described laser driver is the current driver that adopts high speed circuit to make, well drive laser emission laser;
In the specific implementation, described laser instrument is a semiconductor laser, can launch laser according to the drive current of Laser Driven;
In the specific implementation, described shunt adopts; The wideband operation of Shenzhen Science and Technology Ltd. of light Netcom is the standard shunt of 800nm to 1600nm;
In the specific implementation, optical signal detector adopts high sensitivity APD avalanche diode (can adopt the InGaAs APD type avalanche photodide of Shenzhen Xing Bo company) to come exploring laser light, with the casual light signal switching electrical signals of loudspeaker;
In the specific implementation, described coupling mechanism 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 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 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 is the big device of the high performance computing of OPA365 type that adopts Texas Instruments;
In the specific implementation, described data acquisition unit is the high speed data acquisition system that adopts Texas Instruments, and travelling speed is 100Mb/s;
In the specific implementation, described data processor is to adopt the high speed FPGA of ALTERA company to realize;
In the specific implementation, described detecting optical cable 16 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 and detecting optical cable is identical;
In the specific implementation, described computing machine is a general-purpose industrial level computing machine.
As shown in Figure 2, when computing machine sent the beginning measuring command to data processor, data processor drove isochronous controller at once and sends synchronizing pulse requirement laser driver and signal detector and data acquisition unit and start working simultaneously; Laser driver just begins drive laser work after receiving the synchronizing pulse that isochronous controller sends, and continuously sends laser signal in optical fiber; Shunt can go out separation by laser one and be sent to the light signal verifier, is used for checking; Another part Laser Transmission is carried out temperature detection to optical fiber; The back can take place to the loudspeaker diffuse scattering in laser when transmitting in optical fiber, 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 overflow the loudspeaker in the laser signal of sending here separate optical signals and come out, and then sends photoelectric commutator to and convert light signal to electric signal, and then sends electric signal to amplifier and carry out the signal processing and amplifying; The electric signal of crossing through processing and amplifying carries out data acquisition by parallel data acquisition unit, the data that collect through the parallel data acquisition device are sent to the data processor overall treatment, after FPGA high-speed data processor data processed is fed to computing machine displays temperature curve.
The incident light of being told by shunt that leads to the signal verification device also can reduce at that time, the signal verification device (is for example set a week) at regular intervals will start regulator, regulate No. one time amplifier, make its Compensation Regulation amplifier by a certain percentage, must regularly send the professional to measure to debug defective and the deficiency of making to remedy the decay of long-term laser instrument, make parallel data acquisition unit take turns to carry out data collection task in proper order according to certain.
Claims (3)
1. automatic calibration type distributed optical fiber temperature measurement sensing equipment, it mainly comprises crust of the device (14), be provided with laser instrument (3) in the crust of the device (14), 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 output terminal of coupling mechanism (7) is connected with the input end of light filter (8), the output terminal of light filter (8) is connected with the input end of photodetector (9), the output terminal of photodetector (9) is connected with the input end of signal amplifier (10), the output terminal of signal amplifier (10) is connected with the input end of data acquisition unit (11), coupling mechanism (7) locates to be provided with optical fiber interface (15), it is characterized in that: the output terminal of described laser instrument (3) is connected with the input end of shunt (4), the output terminal of shunt (4) respectively with coupling mechanism (7), the input end of optical signal detector (5) connects, the output terminal of optical signal detector (5) is connected with the input end of regulator (6), the output terminal of regulator (6) and signal amplifier (10) another input end be connected, another output terminal of isochronous controller (1) respectively with another input end of optical signal detector (5), another input end of data acquisition unit (11) connects, the input end of isochronous controller (1) is connected with the output terminal of data processor (12), and the input end of data processor (12) is connected with the output terminal of data acquisition unit (11).
2. a kind of automatic calibration type distributed optical fiber temperature measurement sensing equipment according to claim 1 is characterized in that: described data processor (12) and two-way connection of computing machine (13).
3. automatic calibration type distributed optical fiber temperature measurement sensing equipment and using method thereof, it is characterized in that: when computing machine sent the beginning measuring command to data processor, data processor drove isochronous controller at once and sends synchronizing pulse requirement laser driver and signal detector and data acquisition unit and start working simultaneously; Laser driver just begins drive laser work after receiving the synchronizing pulse that isochronous controller sends, and continuously sends laser signal in optical fiber; Shunt can go out separation by laser one and be sent to the light signal verifier, is used for checking; Another part Laser Transmission is carried out temperature detection to optical fiber; The back can take place and overflow (Raman) scattering to loudspeaker in laser when transmitting in optical fiber, 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 overflow the loudspeaker in the laser signal of sending here separate optical signals and come out, and then sends photoelectric commutator to and convert light signal to electric signal, and then sends electric signal to amplifier and carry out the signal processing and amplifying; The electric signal of crossing through processing and amplifying carries out data acquisition by parallel data acquisition unit, the data that collect through the parallel data acquisition device are sent to the data processor overall treatment, after FPGA high-speed data processor data processed is fed to computing machine displays temperature curve, the incident light of being told by shunt that leads to the signal verification device also can reduce at that time, signal verification device (1 hour-480 hours) at regular intervals will start regulator, regulate No. one time amplifier, make it by self-defined proportional compensation resonance-amplifier, make parallel data acquisition unit in turn carry out data collection task in proper order according to certain.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102798487A (en) * | 2011-05-27 | 2012-11-28 | 上海华魏光纤传感技术有限公司 | System and method for off-line automatic calibration for attenuation parameters of detection optical cable |
| CN106205109A (en) * | 2016-06-24 | 2016-12-07 | 桂林创研科技有限公司 | A kind of for monitoring fibre system at a high speed |
| 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 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100388658C (en) * | 2002-09-12 | 2008-05-14 | 中兴通讯股份有限公司 | Apparatus and method for adjusting mean slope of multi-pumping Raman amplifier gain spectrum |
| CN1212713C (en) * | 2003-09-19 | 2005-07-27 | 烽火通信科技股份有限公司 | Dynamic gain balancing method and optical transmission system therewith |
| CN2713524Y (en) * | 2004-06-25 | 2005-07-27 | 北京邮电大学 | Temperature controller for Raman optical fiber amplifier |
| CN201247111Y (en) * | 2008-09-01 | 2009-05-27 | 上海华魏自动化设备有限公司 | Automatic calibration type distributed optical fiber temperature measurement sensing equipment |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102798487A (en) * | 2011-05-27 | 2012-11-28 | 上海华魏光纤传感技术有限公司 | System and method for off-line automatic calibration for attenuation parameters of detection optical cable |
| CN106205109A (en) * | 2016-06-24 | 2016-12-07 | 桂林创研科技有限公司 | A kind of for monitoring fibre system at a high speed |
| 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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