CN102798487B - Non-line type calibrates the System and method for of detecting optical cable attenuation parameter automatically - Google Patents
Non-line type calibrates the System and method for of detecting optical cable attenuation parameter automatically Download PDFInfo
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- CN102798487B CN102798487B CN201110140811.8A CN201110140811A CN102798487B CN 102798487 B CN102798487 B CN 102798487B CN 201110140811 A CN201110140811 A CN 201110140811A CN 102798487 B CN102798487 B CN 102798487B
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Abstract
The invention discloses a kind of non-line type and automatically calibrate the System and method for of detecting optical cable attenuation parameter, when needs are calibrated, end at detecting optical cable connects a luminous reflectance module, and control distributed optical fiber temperature sensing system main frame, adjust light-pulse generator repetition rate, the half to normal mode, adjust signal acquisition module, make its acquisition length double automatically to calibrate, such that it is able to accurately obtain detecting optical cable attenuation parameter.When normally working, adjust light-pulse generator repetition rate, to normal mode, take luminous reflectance module, enter normal mode of operation.Thus realize at the scene detecting optical cable being calibrated, compensating, add effective usage degree of distributed optical fiber temperature sensing system, improve systematic function.
Description
Technical field
The present invention relates to distributed optical fiber temperature sensor technology field, particularly relate to distributed fiber temperature sensing system
The Automatic Calibration Technique field of system.
Background technology
Distributed optical fiber temperature sensing system is based on backscattering principle, when laser pulse is in fiber-optic transfer, light
Fibre can constantly produce Raman scattering (Stokes, anti-Stokes), Rayleigh scattering and Brillouin scattering etc.
Scattered light, a portion opposite direction can be transferred to " source ", and our this some scattered light is called " to dissipate dorsad
Penetrate light ".Distributed optical fiber temperature sensing system uses in Raman Back Scattering anti-Stokes as temperature exactly
A kind of temperature-sensing system of sensitive signal.
Distributed optical fiber temperature sensing system is generally made up of distributed fiber temperature sensing main frame and detecting optical cable.
Distributed optical fiber temperature sensing system, before dispatching from the factory, needs the demarcation carrying out calculating parameter, and this demarcation is with spy
Determining detecting optical cable is object.When distributed optical fiber temperature sensing system delivers to customer to use, the detection of use
Optical cable is probably different, may result in changing of the figure parameters such as Stokes and anti-Stokes attenuation parameter
Become.In order to ensure the measuring precision, need calculating parameter is compensated and corrected.And distributed fiber optic temperature
The working environment of the detecting optical cable used by sensor-based system is typically the wild environments such as tunnel, colliery, transformer station, visits
The temperature of light-metering cable is difficult to determine with the distribution situation of length, will carry out optical cable as producer or laboratory
It is unpractical that attenuation parameter is demarcated, and this have impact on having of distributed optical fiber temperature sensing system to a certain extent
Effect uses, and reduces systematic function.
Summary of the invention
In order to solve problem present in above-mentioned technology, the present invention provides a kind of non-line type automatically to calibrate detection light
Cable attenuation parameter system.
In order to achieve the above object, the technical solution adopted in the present invention is as follows:
A kind of non-line type calibrates the system of detecting optical cable attenuation parameter automatically, including distributed fiber temperature sensing
System host and detecting optical cable, it is characterised in that: described detecting optical cable tail end connects a luminous reflectance module.
Described detecting optical cable tail end arranges joints of optical fibre, and the joints of optical fibre connect described luminous reflectance module.
Described luminous reflectance module be have reflection light function reflection unit, can be reflecting mirror, plated film device,
Metal covering or Bragg grating.
Described reflecting module is manifold type reflection unit, can be 1 × 2 bonder, 2 × 2 bonders；Coupling
One side ports of box-like reflection unit directly connects with detecting optical cable or passes through the joints of optical fibre and detecting optical cable
Connecting, two ports of other side are connected by fiber waveguide.
The function of described reflecting module is the luminous reflectance in detecting optical cable can enter detecting optical cable, reflection
The rear orientation light of the light generation entering detecting optical cable is entered distributed again by reflecting module by detecting optical cable
Fiber temperature sensing system main frame carries out data process, finally gives two groups of data letters of same section of detecting optical cable
Breath, in order to calibrate the attenuation parameter of detecting optical cable.
Described detecting optical cable is laid on the wild environments such as tunnel, colliery, transformer station, is used for measuring ambient temperature；
Described detecting optical cable tail end arranges joints of optical fibre.
When detecting optical cable needs automatically to calibrate, can be connected to detect by reflecting module by the joints of optical fibre
Optical cable tail end, and distributed optical fiber temperature sensing system main frame is set to automatic calibration mode.
Include that light-pulse generator, wavelength division multiplexer, signal connect in described distributed optical fiber temperature sensing system main frame
Receive the parts such as module, signal acquisition module, signal processing module, reference optical fiber.
Light-pulse generator produces pulsed light, the Raman Back Scattering that pulsed light produces in the transmitting procedure of detecting optical cable
Light carries the temperature information at respective distance；Wavelength division multiplexer is for by Raman Back Scattering light from other dorsad
Scattered light filters out, and is transported to signal receiving module from corresponding optical interface；
Signal receiving module is in order to the opto-electronic conversion of scattered light signal and amplification；
Signal acquisition module for analogue signal that signal receiving module is transmitted be converted into digital signal with
For subsequent treatment；It can in addition contain the synchronization pulse that reception light-pulse generator sends is to portion some other in main frame
Part is controlled；
Signal processing module is for processing the data received and analyze, and is controlled correlation module
And operation；
Reference optical fiber is placed in inside distributed optical fiber temperature sensing system main frame, one end connection wavelength division multiplexer, and one
End connects detecting optical cable, for described non-line type is calibrated the temperature of the system of detecting optical cable attenuation parameter automatically
Calibrate.
The invention discloses a kind of method that non-line type calibrates detecting optical cable attenuation parameter automatically, including following step
Rapid:
The first step, switching distributed optical fiber temperature sensing system main frame enters automatic calibration mode, adjusts pulsed light
Source repetition rate, the half to normal mode, on the premise of ensureing system worked well, light-pulse generator
Repetition rate reduces half, and the pulse period is doubled so that the measurement length of detecting optical cable is doubled.
Due to the existence of luminous reflectance module, for same section of detecting optical cable, measure length double mean right
Same detecting optical cable carries out twice data acquisition；Adjust acquisition module so that it is acquisition length doubles simultaneously.
The data collected are carried out data prediction, revises owing to receiving the data distortion problem that circuit causes；
Second step, carries out doubling be divided by Stokes and the Anti-Stokes data through data prediction respectively
Processing, the data owing to collecting in the calibration mode are actually twice and to obtain through same optical cable, for this
Here doubling require a data point should one_to_one corresponding, thus obtain new two group data, these two groups of data are divided
The most relevant with Stokes and anti-Stokes attenuation parameter, attenuation parameter equation one is constituted for this；Due to twice
It is contrary that excitation light pulse signal enters the direction of optical cable, so the attenuation parameter of point of symmetry position (certain position
The attenuation parameter at the place of putting is defined as the average attenuation parameter from optical cable initiating terminal to this position) the most also it is different
, but decay (decay factor) sum that two attenuation parameters cause is a fixed value, total equal to optical cable
Decay (the complete attenuation factor), this constitutes attenuation parameter equation two.Above-mentioned two equations of simultaneous, can solve light
Decay factor at cable each position.
3rd step, carry out being divided by mathematics by the decay factor data of the two groups of Stokes obtained and anti-Stokes
Process, it is possible to obtain Stokes and the anti-Stokes coefficient difference of in-situ measurement optical cable, i.e. system attenuation ginseng
Number.This attenuation parameter is modified, eliminates the differential loss brought due to detecting optical cable.
4th step, adjusts light-pulse generator and acquisition module recovers normal mode of operation, by luminous reflectance module from detection
Take off on optical cable, complete the automatic calibration of detecting optical cable attenuation parameter.
The advantage using technical solutions according to the invention is: by connecting a reflection at the end of detecting optical cable
Module, and automatically calibrate, such that it is able to accurately obtain by controlling distributed optical fiber temperature sensing system main frame
Obtain the attenuation parameter of detecting optical cable, it is achieved at the scene detecting optical cable calibrated, compensate, add distributed
Effective usage degree of fiber temperature sensing system, improves systematic function.
Accompanying drawing explanation
System structure schematic diagram described in Fig. 1 embodiment of the present invention 1；
System structure schematic diagram described in Fig. 2 embodiment of the present invention 2；
The reflecting module that Fig. 3 is reflection mode；
Fig. 4 is the reflecting module of coupled modes；
Fig. 5 is the program flow diagram of calibration automatically；
Detailed description of the invention
Below in conjunction with the accompanying drawings to the side of calibration automatically for distributed optical fiber temperature sensing system of the present invention
Method and device are explained in detail.
Embodiment 1: as it is shown in figure 1, a kind of non-line type calibrates the system of detecting optical cable attenuation parameter automatically,
Including distributed optical fiber temperature sensing system main frame and detecting optical cable 8, connect a reflection at detecting optical cable 8 tail end
Module 10, the reflecting module 10 described in the present embodiment is a reflective reflection unit, can be reflecting mirror, plating
Membrane module, metal covering or Bragg grating, the present embodiment selects plated film device 11.
The luminous reflectance of detecting optical cable 8 tail end can be entered detecting optical cable 8 by plated film device 11, is reflected into visiting
The back scattering that the light of light-metering cable 8 produces is entered distributed light again by reflection unit 10 by detecting optical cable 8
Fine temperature-sensing system main frame, finally gives two groups of data messages of same section of detecting optical cable 8, in order to calibrate spy
The attenuation parameter of light-metering cable.
Described distributed optical fiber temperature sensing system main frame includes light-pulse generator 1, wavelength division multiplexer 2, signal
Receiver module 3 and signal receiving module 4, signal acquisition module 5, signal processing module 6, reference optical fiber 7
Deng parts.
Light-pulse generator 1 produces pulsed light, the Raman dorsad that pulsed light produces in the transmitting procedure of detecting optical cable 8
Scattered light carries the temperature information at respective distance；Wavelength division multiplexer 2 is used for Raman Back Scattering light from it
He filters out in back-scattering light, and is transported to signal receiving module 3 and signal reception from corresponding optical interface
Module 4；Signal receiving module 3 and signal receiving module 4 are in order to carry out the Raman Back Scattering light received
Opto-electronic conversion and amplification；Signal acquisition module 5 is for transmitting signal receiving module 3 and signal receiving module 4
The analogue signal come over is converted into digital signal for subsequent treatment；Signal processing module 6 is for receiving
Data process and analyze, and are controlled correlation module and operate；Reference optical fiber 7 is placed in inside main frame,
Outer even detecting optical cable, for calibrating the temperature of system.
Non-line type calibrates the method for detecting optical cable attenuation parameter automatically, as it is shown in figure 5, comprise the following steps:
The first step, switching distributed optical fiber temperature sensing system main frame enters automatic calibration mode, adjusts pulsed light
Source 1 repetition rate, the half to normal mode, adjust acquisition module 5 so that it is acquisition length improves simultaneously
One times.The data collected are carried out data prediction, revises owing to receiving the data distortion problem that circuit causes；
Second step, carries out doubling be divided by Stokes and the Anti-Stokes data through data prediction respectively
Processing, thus obtain new two group data, these two groups of data decay with Stokes and anti-Stokes respectively and join
Number is relevant, constitutes attenuation parameter equation one for this；Owing to the direction of twice excitation light pulse signal entrance optical cable is
Contrary, so the attenuation parameter of point of symmetry position is the most also different, but two attenuation parameters are led
The decay sum caused is a fixed value, the decay total equal to detecting optical cable, and this constitutes attenuation parameter equation two,
Above-mentioned two equations of simultaneous, can solve the decay factor at detecting optical cable each position；
3rd step, carry out being divided by mathematics by the decay factor data of the two groups of Stokes obtained and anti-Stokes
Process, it is possible to obtain Stokes and the anti-Stokes coefficient difference of in-situ measurement optical cable, i.e. system attenuation ginseng
Number.This attenuation parameter is modified, eliminates the differential loss brought due to detecting optical cable；
4th step, adjusts light-pulse generator 1 and acquisition module 5 and recovers normal mode of operation, by luminous reflectance module from
Take off on detecting optical cable, complete the automatic calibration of detecting optical cable attenuation parameter.
Embodiment 2: as in figure 2 it is shown, a kind of non-line type calibrates the system of detecting optical cable attenuation parameter automatically,
Including distributed optical fiber temperature sensing system main frame and detecting optical cable 8, the tail end at detecting optical cable 8 arranges a light
Fiber connector 9, reflecting module 10 is connected on the joints of optical fibre 9, the reflecting module 10 described in the present embodiment
It is a reflective reflection unit, can be reflecting mirror, plated film device, metal covering or Bragg grating, this reality
Execute example and select reflecting mirror 11.
The luminous reflectance of detecting optical cable 8 tail end can be entered detecting optical cable 8 by reflecting mirror 11, is reflected into detection
The back scattering that the light of optical cable 8 produces is entered distribution type fiber-optic temperature again by reflecting mirror 11 by detecting optical cable 8
Degree sensor-based system main frame, finally gives two groups of data messages of same section of detecting optical cable 8, in order to calibrate detection light
The attenuation parameter of cable.
Detecting optical cable 8 is laid on the wild environments such as tunnel, colliery, transformer station, is used for measuring ambient temperature；Visit
Light-metering cable 8 tail end arranges joints of optical fibre 9.When detecting optical cable 8 needs automatically to calibrate, can pass through
Reflecting module 10 is connected to detecting optical cable 8 tail end by the joints of optical fibre 9, and by distributed fiber temperature sensing
System host is set to automatic calibration mode.
The concrete calibrating principle of system and step are with embodiment 1.
Embodiment 3, as shown in Figure 4, described reflecting module 10 is the reflecting module of coupled modes, permissible
It is 1 × 2 bonder, 2 × 2 bonders；The present embodiment selects 1 × 2 bonder 12,1 × 2 bonder 12
A side ports directly and detecting optical cable 8 connects or by the joints of optical fibre and detecting optical cable connection, other one
Two ports of side are connected by fiber waveguide 13, and fiber waveguide 13 herein can be optical fiber, lens or optics
System, the present embodiment selects optical fiber.
The luminous reflectance of detecting optical cable 8 tail end can be entered detecting optical cable 8 by 1 × 2 bonder 12, is reflected into
The back scattering that the light of detecting optical cable 8 produces is entered distribution again by 1 × 2 bonder 12 by detecting optical cable 8
Formula fiber temperature sensing system main frame, finally gives two groups of data messages of same section of detecting optical cable 8, in order to school
The attenuation parameter of quasi-detecting optical cable.
The concrete calibrating principle of system and step are with embodiment 1.
Ultimate principle and the principal character advantages of the present invention of the present invention are more than shown and described.The technology of the industry
Personnel are not it should be recognized that the present invention is limited by above-mentioned using method, described in above-mentioned using method and description
Simply saying the principle of the present invention, the present invention also has various change without departing from the spirit and scope of the present invention
Change and improve, these changes and improvements in both falling within the claimed scope of the invention claimed scope by
Appending claims and equivalent thereof define.
Claims (6)
1. non-line type calibrates a system for detecting optical cable attenuation parameter automatically, passes including distributed fiber optic temperature
Sensing system main frame and detecting optical cable, it is characterised in that: described detecting optical cable tail end connects a luminous reflectance module；
Described detecting optical cable tail end arranges joints of optical fibre, and the joints of optical fibre connect described luminous reflectance module；Institute
The luminous reflectance module stated is to have the reflection unit of reflection light function.
Non-line type the most according to claim 1 calibrates the system of detecting optical cable attenuation parameter automatically, and it is special
Levy and be: described reflection unit can be reflecting mirror, plated film device, metal covering or Bragg grating.
Non-line type the most according to claim 1 calibrates the system of detecting optical cable attenuation parameter automatically, and it is special
Levy and be: described luminous reflectance module is manifold type reflection unit, can be 1 × 2 bonder, 2 × 2 couplings
Device.
A kind of non-line type the most according to claim 1 calibrates the system of detecting optical cable attenuation parameter automatically,
It is characterized in that: described distributed optical fiber temperature sensing system main frame include light-pulse generator, wavelength division multiplexer,
Signal receiving module, signal acquisition module, signal processing module, reference optical fiber.
A kind of non-line type the most according to claim 4 calibrates the system of detecting optical cable attenuation parameter automatically,
It is characterized in that: described reference optical fiber one end connects wavelength division multiplexer, one end connects detecting optical cable.
6. the method that a non-line type calibrates detecting optical cable attenuation parameter automatically, it is characterised in that: include as follows
Step: the first step, switching distributed optical fiber temperature sensing system main frame enters automatic calibration mode, adjusts arteries and veins
Wash source repetition rate off, the half to normal mode, adjust acquisition module so that it is acquisition length carries simultaneously
Double；The data collected are carried out data prediction, revises owing to receiving the data distortion that circuit causes
Problem；Second step, carries out doubling to Stokes and the Anti-Stokes data through data prediction respectively
Be divided by process, thus obtain new two group data, these two groups of data respectively with Stokes and anti-Stokes
Attenuation parameter is relevant, constitutes attenuation parameter equation one for this；Owing to twice excitation light pulse signal enters optical cable
Direction be contrary, so the attenuation parameter of point of symmetry position is the most also different, but two
The decay sum that attenuation parameter causes is a fixed value, the decay total equal to detecting optical cable, and this constitutes decay
Parametric equation two, above-mentioned two equations of simultaneous, the decay factor at detecting optical cable each position can be solved；The
Three steps, carry out being divided by Mathematical treatment by the decay factor data of the two groups of Stokes obtained and anti-Stokes,
It is obtained with Stokes and the anti-Stokes coefficient difference of in-situ measurement optical cable, i.e. system attenuation parameter；
This attenuation parameter is modified, eliminates the differential loss brought due to detecting optical cable；4th step, adjusts arteries and veins
Wash source off and acquisition module recovers normal mode of operation, luminous reflectance module is taken off from detecting optical cable, completes
The automatic calibration of detecting optical cable attenuation parameter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110140811.8A CN102798487B (en) | 2011-05-27 | Non-line type calibrates the System and method for of detecting optical cable attenuation parameter automatically |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110140811.8A CN102798487B (en) | 2011-05-27 | Non-line type calibrates the System and method for of detecting optical cable attenuation parameter automatically |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102798487A CN102798487A (en) | 2012-11-28 |
| CN102798487B true CN102798487B (en) | 2016-12-14 |
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| SE01 | Entry into force of request for substantive examination | ||
| CB03 | Change of inventor or designer information |
Inventor after: Wang Zhanfeng Inventor after: Zhang Lili Inventor after: Long Yi Inventor after: Mao Lijuan Inventor after: Guo Zhaokun Inventor before: Guo Zhaokun |
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20161214 Termination date: 20170527 |