CN102661817A - Distributed optical fiber temperature sensing system capable of automatically configuring parameters and configuration method thereof - Google Patents
Distributed optical fiber temperature sensing system capable of automatically configuring parameters and configuration method thereof Download PDFInfo
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- CN102661817A CN102661817A CN2012101810562A CN201210181056A CN102661817A CN 102661817 A CN102661817 A CN 102661817A CN 2012101810562 A CN2012101810562 A CN 2012101810562A CN 201210181056 A CN201210181056 A CN 201210181056A CN 102661817 A CN102661817 A CN 102661817A
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Abstract
The invention discloses a distributed optical fiber temperature sensing system capable of automatically configuring parameters and a configuration method thereof. The system comprises a system shell, a laser, a laser driving module, a beam-splitting filter module, an optical switching switch, a photoelectric conversion module, a signal processing module, a data acquisition unit and a computer processing unit. The method comprises the following steps of: collecting data of each optical channel; judging optical fiber information in the optical channels and automatically configuring parameters of the optical channels according to the acquired information; and transmitting the data acquired in the step A and performing automatic compensation of loss deviation. The distributed optical fiber temperature sensing system capable of automatically configuring parameters and the configuration method thereof provided by the invention has the advantages that the parameters in each channel are automatically configured, the various parameters are not required to be debugged by professionals, and lots of manpower and material resources are saved; the optical fiber connectors and optical fiber laying quality can be automatically judged, and the problems are rapidly discovered and positioned; and moreover, the optical fiber transmission loss can be automatically and accurately compensated, and the temperature calculation accuracy is improved.
Description
Technical field
the present invention relates to the distributed optical fiber temperature sensing system and the collocation method of a kind of fiber temperature sensing system and collocation method, particularly a kind of automatic configuration parameter.
Background technology
distributed optical fiber temperature sensing system utilizes optical time domain reflection technology and Raman scattering technology; May detect the temperature information of optical fibre installation all positions along the line; The longest fiber lengths that connects of single channel reaches 30km, and the fire alarm that therefore is widely used in tunnel, colliery, electric system is reported to the police, in the real time temperature monitoring of petroleum and petrochemical sector; Become the temperature monitoring Developing Trend in Technology, had vast market prospect.
existing distributed fiber temperature sensing system is made up of main frame and optical fiber two parts; Optical fiber is connected on the main frame through fiber adapter, and the difference of the joints of optical fibre, fiber adapter and fiber type all can influence the Temperature numerical of calculating.Main frame has been provided with the necessary parameter of normal operation before though dispatch from the factory; But according to the actual conditions of using field optical fibers connector and optical fiber still needs situ configuration parameter; On-site parameters configuration at present needs the professional to carry out; Need judge rule of thumb the joints of optical fibre connect whether unusual weld and extruding point are arranged in situation and the optical fibre installation process; Need manual input optical fibre length, two-way loss compensating parameter etc., fully rule of thumb manually the numerical value of input might cause temperature computation inaccurate, causes false alarm.
distributed optical fiber temperature sensing system can expand to maximum 64 passages through the light change-over switch, and temperature survey is carried out in timesharing.The parameter of each passage all needs manual configuration, and the manpower and materials of cost are sizable.
Summary of the invention
the objective of the invention is to, and a kind of distributed optical fiber temperature sensing system and collocation method of automatic configuration parameter is provided.The present invention can judge automatically whether unusual weld and extruding point are arranged; Can realize automatic configuration to parameters such as fiber lengths, two-way loss compensating parameters; Effectively improved the present situation of present artificial judgment by rule of thumb and manual configuration optical fiber parameter; Improve the accuracy that system temperature calculates, greatly reduced the input of manpower and materials.
technical scheme of the present invention: a kind of distributed optical fiber temperature sensing system of automatic configuration parameter; Comprise system shell; Be provided with laser instrument in the system shell; The input end of laser instrument links to each other with the output terminal of Laser Drive module, and the output terminal of laser instrument links to each other with the input end of beam split filtration module, and the output terminal of beam split filtration module is connected with the input end of light change-over switch and the input end of photoelectric conversion module respectively; The output terminal of light change-over switch is connected with optical fiber; The output terminal of photoelectric conversion module links to each other with the input end of signal processing module, and an output terminal of signal processing module is connected with the input end of data acquisition unit, and the output terminal of data acquisition unit is connected with computer processing unit; Signal processing module has an output terminal to be connected with the input end of Laser Drive module; Signal processing module also is provided with two ports, is connected with the light change-over switch is two-way with computer processing unit respectively, and computer processing unit comprises optical fiber parameter intelligent set module and the automatic calibration module of temperature.
The collocation method of aforesaid distributed optical fiber temperature sensing system may further comprise the steps:
A, the data of coming all passages of acquisition order to optical channel emission laser pulse through said system, and the data that obtained are passed to computer processing unit;
B, said optical fiber parameter intelligent set module dispose the parameter of optical fiber automatically according to the optical fiber information in the data judgement optical channel of steps A collection and according to resulting optical fiber information;
C, the automatic calibration module of said temperature carry out the automatic compensation of loss deviation according to the data in the steps A.
In the collocation method of
aforesaid distributed optical fiber temperature sensing system, Raman scattering takes place in said optical fiber after receiving laser pulse, and optical fiber parameter intelligent set module obtains Stokes and anti-Stokes data.
In the collocation method of
aforesaid distributed optical fiber temperature sensing system; The automatic calibration module of the described temperature of step C is according to the fiber transmission attenuation formula loss of match Stokes and anti-Stokes data respectively, and writes database automatically data are compensated.
In the collocation method of
aforesaid distributed optical fiber temperature sensing system; Said step B is: optical fiber parameter intelligent set module confirms to be connected with in the system optical channel numbering of optical fiber according to Stokes and anti-Stokes data, and judges the user mode of these optical fiber.
In the collocation method of
aforesaid distributed optical fiber temperature sensing system, said optical fiber parameter intelligent set module judges whether fibre-optical splice is normal earlier, if unusually then joint is checked in prompting.
In the collocation method of
aforesaid distributed optical fiber temperature sensing system; Said optical fiber parameter intelligent set module compares first threshold values of initial setting in Stokes and anti-Stokes data and the system, confirms that joint connects normal optical-fibre channel.
In the collocation method of
aforesaid distributed optical fiber temperature sensing system; Said optical fiber parameter intelligent set module compares second threshold values of initial setting in Stokes and anti-Stokes data and the system to be judged and is connected to length of fiber on the passage, confirms the sampling number of capture card and writes database with this.
In the collocation method of
aforesaid distributed optical fiber temperature sensing system, said optical fiber parameter intelligent set module is through judging whether Stokes and anti-Stokes data and curves have the amplitude catastrophe point to confirm whether to have in the optical fibre installation process unusual weld or extruding point.
compared with prior art, the present invention has constituted the distributed optical fiber temperature sensing system and the collocation method of automatic configuration parameter through system shell, laser instrument, Laser Drive module, beam split filtration module, light change-over switch, photoelectric conversion module, signal processing module, data acquisition unit, computer processing unit.The present invention can realize the state of intelligent decision distributed optical fiber temperature sensing system, and automatic configuration system is moved the parameter that needs basically, has following advantage:
1. the parameter of every passage realizes preparation automatically, and reduced project running shut down time and number of times less than 1 minute setup time, improved work efficiency;
2. do not need the professional to debug various parameters, reduced work difficulty and cost;
3. carry out the judgement of the joints of optical fibre and optical fibre installation quality automatically, can find fast and orientation problem;
The accuracy that accounting temperature has 4. been improved in
has been avoided the wrong report that problem causes is set and fails to report because of parameter, helps extensively popularizing of distributed optical fiber temperature sensing system.
Description of drawings
Fig. 1 is according to system block diagram of the present invention;
Being labeled as in
accompanying drawing: 1-laser instrument, 2-Laser Drive module, 3-beam split filtration module, 4-light change-over switch; The 5-photoelectric conversion module, 6-signal processing module, 7-data acquisition unit; The 8-computer processing unit, 9-system shell, 10-optical fiber.
Embodiment
are further described the present invention below in conjunction with accompanying drawing and embodiment, but not as the foundation to the present invention's restriction.
embodiment.A kind of embodiment of distributed optical fiber temperature sensing system of automatic configuration parameter: it is as shown in Figure 1 that system constitutes block scheme; It mainly comprises system shell 9; System shell 9 built-in laser instruments 1, the input end of laser instrument 1 links to each other with output terminal with Laser Drive module 2, and the output terminal of laser instrument 1 links to each other with the input end of beam split filtration module 3; The output terminal of beam split filtration module 3 is connected with the input end of light change-over switch 4 and the input end of two photoelectric conversion modules 5 respectively; The output terminal of light change-over switch 4 is connected with optical fiber 10, can connect N bar optical fiber 10 (N is an integer, more than or equal to 1); The output terminal of photoelectric conversion module 5 links to each other with the input end of signal processing module 6; An output terminal of signal processing module 6 is connected with the input end of data acquisition unit 7, and the output terminal of data acquisition unit 7 is connected with computer processing unit, and signal processing module 6 has an output terminal to be connected with the input end of Laser Drive module 2; Signal processing module 6 also has two ports, respectively with computer processing unit 8 and 4 two-way connections of light change-over switch.Computer processing unit 8 is arranged on the data processing software in the host computer system, comprises that optical fiber parameter is provided with module and the automatic calibration module of temperature automatically.
The collocation method of said system may further comprise the steps:
A, the data of coming all passages of acquisition order to optical channel emission laser pulse through system, and the data that obtained are passed to computer processing unit 8;
B, optical fiber parameter intelligent set module dispose the parameter of optical fiber automatically according to the optical fiber information in the data judgement optical channel of steps A collection and according to resulting optical fiber information;
C, the automatic calibration module of temperature carry out the automatic compensation of loss deviation according to the data in the steps A.
Raman scattering takes place in
optical fiber 10 after receiving laser pulse, optical fiber parameter intelligent set module obtains Stokes and anti-Stokes data.
The automatic calibration module of temperature among
step C is according to the fiber transmission attenuation formula loss of match Stokes and anti-Stokes data respectively, and writes database automatically data are compensated.
step B is: optical fiber parameter intelligent set module confirms to be connected with in the system optical channel numbering of optical fiber according to Stokes and anti-Stokes data, and judges the user mode of these optical fiber.
optical fiber parameter intelligent set module earlier judges whether fibre-optical splice is normal, if unusually then joint is checked in prompting.
optical fiber parameter intelligent set module compares first threshold values of initial setting in Stokes and anti-Stokes data and the system, confirms that joint connects normal optical-fibre channel.
optical parameter intelligent set module compares second threshold values of initial setting in Stokes and anti-Stokes data and the system to be judged and is connected to length of fiber on the passage, confirms the sampling number of capture card and writes database with this.
optical fiber parameter intelligent set module is through judging whether Stokes and anti-Stokes data and curves have the amplitude catastrophe point to confirm whether to have in the optical fibre installation process unusual weld or extruding point.
A kind of course of work of cloth formula fiber temperature sensing system of automatic configuration parameter is following:
The numbering of
optical channel is pre-set by the client, can be set to 1,2,3 ... N.After the system start-up operation, selected earlier as required to want the optical channel of image data to number by the client, such as selecting to be numbered three optical channels of 1,2,3, the back sends to signal processing module 6 by computer processing unit 8 with these three optical channel numberings.Signal processing module 6 sends OPEN for light change-over switch 4; Send a run signal simultaneously for again Laser Drive module 2 and data acquisition unit 7; Laser Drive module 2 beginning drive laser 1 are sent pulse laser, and data acquisition unit 7 begins image data simultaneously.Pulse laser is input in the passage of light change-over switch 4 switchings through beam split filtration module 3.If passage does not connect optical fiber, behind the pulse laser admission passage Raman scattering does not take place so, system receive for amplitude be near the invalid data 0.If passage is connected with optical fiber, pulse laser is connected to optical fiber 10 so.Raman scattering can constantly take place on the optical fiber 10.Raman scattering signal pathway light change-over switch 4 enters into beam split filtration module 3 dorsad; Needed stokes light and anti-Stokes light get into respectively in two photoelectric conversion modules and carry out opto-electronic conversion and signal filtering; Get into data acquisition unit 7 again and carry out the A/D conversion, be input at last in the computer processing unit 8 and handle.
The module that
optical fiber parameter is provided with automatically reads the fiber lengths in the optical channel: in module, preestablish initial setting second threshold value of judging fiber lengths; Such as being made as 6; Fiber lengths of all corresponding demonstration of the Stokes numerical value of each reception; Each Stokes numerical value and 6 is compared, and the pairing length of previous Stokes numerical value of that Stokes numerical value less than 6 is fiber lengths.Collected string number can be such 80,78,76,5,0.1 ,-0.2,0.3 to the end in the reality ... The back all has been near the numerical value 0.Can find in the data than threshold values 6 little numerals it is that 5,5 fronts be digital 76, optical fiber parameter is provided with module automatically and just thinks that numerical value 76 pairing fiber lengths are these channel attached fiber lengths so, and writes database.In the middle of this process; Optical fiber parameter is provided with module automatically and judges whether simultaneously amplitude catastrophe point (the amplitude catastrophe point is the point of numerical value bust) judges whether unusual weld or extruding point are arranged in the optical fibre installation process; And point out this abnormity point position to give the client, judge whether to need to handle or ignore by the user.
When light transmits in optical fiber,, cause luminous power to decay by index law, be referred to as fiber transmission attenuation, be expressed as with transmission range owing to absorption and scattering, the defective of optical fiber structure and the reasons such as coupling imperfection between bending and optical fiber of fiber optic materials to light
, the loss of same optical fiber is relevant with wavelength.
The principle of
distributed optical fiber temperature sensing system temperature computation is following: when light transmits in optical fiber Raman scattering can take place; Produce stokes light and anti-Stokes light; Wherein anti-Stokes light is very responsive to temperature; Can become big along with the rising amplitude of temperature, stokes light then can change hardly, just can accounting temperature according to the ratio of both amplitudes.
are still because stokes light is different with the anti-Stokes optical wavelength; Then loss is different; So in calculating optical fiber, need compensate because of stokes light and the inconsistent loss deviation that causes of anti-Stokes light two-way wavelength in the temperature of any point, otherwise can influence the accuracy of temperature computation.
The fiber transmission attenuation formula:
Vs refers to first numerical value of Stokes data, and Vs (L) refers to the Stokes numerical value at L place in any point on the optical fiber, and the L in the formula representes L point length of fiber,
Refer to the loss value of stokes light in certain optical fiber.
Refer to first numerical value of anti-Stokes data, Vas (L) refers to the Stokes numerical value at L place in any point on the optical fiber, and the L in the formula representes L point length of fiber,
Refer to the loss value of anti-Stokes light in certain optical fiber.
System simulates loss value separately respectively according to the Stokes that collects and the data of anti-Stokes
With
, just can compensate respectively by the above-mentioned formula of substitution.
Claims (9)
1. the distributed optical fiber temperature sensing system of an automatic configuration parameter; It is characterized in that: comprise system shell (9); Be provided with laser instrument (1) in the system shell (9); The input end of laser instrument (1) links to each other with the output terminal of Laser Drive module (2); The output terminal of laser instrument (1) links to each other with the input end of beam split filtration module (3); The output terminal of beam split filtration module (3) is connected with the input end of photoswitch (4) and the input end of two photoelectric conversion modules (5) respectively, and the output terminal of light change-over switch (4) is connected with optical fiber (10), and the output terminal of photoelectric conversion module (5) links to each other with the input end of signal processing module (6); An output terminal of signal processing module (6) is connected with the input end of data acquisition unit (7); The output terminal of data acquisition unit (7) is connected with computer processing unit (8), and signal processing module (6) has an output terminal to be connected with the input end of Laser Drive module (2), and signal processing module (6) also is provided with two ports; With computer processing unit (8) and two-way connection of light change-over switch (4), computer processing unit (8) comprises optical fiber parameter intelligent set module and the automatic calibration module of temperature respectively.
2. according to the collocation method of the said system of claim 1, it is characterized in that, may further comprise the steps:
A, the data of coming all passages of acquisition order to optical channel emission laser pulse through described system, and the data that obtained are passed to computer processing unit (8);
B, described optical fiber parameter intelligent set module dispose the parameter of optical fiber automatically according to the optical fiber information in the data judgement optical channel of steps A collection and according to resulting optical fiber information;
C, the automatic calibration module of described temperature carry out the automatic compensation of loss deviation according to the data in the steps A.
3. collocation method according to claim 2 is characterized in that: Raman scattering takes place in described optical fiber (10) after receiving laser pulse, and optical fiber parameter intelligent set module obtains Stokes and anti-Stokes data.
4. collocation method according to claim 3; It is characterized in that: the automatic calibration module of the described temperature of step C is according to the fiber transmission attenuation formula loss of match Stokes and anti-Stokes data respectively, and writes database automatically data are compensated.
5. according to claim 3 or 4 described collocation methods; It is characterized in that; Described step B is: optical fiber parameter intelligent set module confirms to be connected with in the system optical channel numbering of optical fiber according to Stokes and anti-Stokes data, and judges the user mode of these optical fiber.
6. collocation method according to claim 5 is characterized in that: described optical fiber parameter intelligent set module judges whether fibre-optical splice is normal earlier, if unusually then joint is checked in prompting.
7. collocation method according to claim 6 is characterized in that: described optical fiber parameter intelligent set module compares first threshold values of initial setting in Stokes and anti-Stokes data and the system, confirms that joint connects normal optical-fibre channel.
8. collocation method according to claim 7; It is characterized in that: described optical fiber parameter intelligent set module compares second threshold values of initial setting in Stokes and anti-Stokes data and the system to be judged and is connected to length of fiber on the passage, confirms the sampling number of capture card and writes database with this.
9. according to claim 7 or 8 described collocation methods, it is characterized in that: described optical fiber parameter intelligent set module is through judging whether Stokes and anti-Stokes data and curves have the amplitude catastrophe point to confirm whether to have in the optical fibre installation process unusual weld or extruding point.
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Application publication date: 20120912 |