CN101893490B - Receiving subsystem for distributed fiber temperature sensing system and monitoring method thereof - Google Patents
Receiving subsystem for distributed fiber temperature sensing system and monitoring method thereof Download PDFInfo
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Abstract
The invention discloses a receiving subsystem for a distributed fiber temperature sensing system and a monitoring method thereof. The receiving subsystem mainly comprises an APD and a preamplifier module thereof, a variable gain main amplifying circuit, a high-voltage control chip and a monitoring control module, wherein the monitoring control module is connected with the variable gain main amplifying circuit and the high-voltage control chip respectively to monitor the gain value of the variable gain main amplifying circuit and the high voltage value of the high-voltage control chip and regulate the variable gain main amplifying circuit and the high-voltage control chip so as to change the gain value and the high voltage value thereof. The monitoring method can realize real-time monitoring of the working state of the subsystem and real-time regulation of the working parameter so as to ensure long-term stable and accurate operation of the receiving subsystem.
Description
Technical field
The present invention relates to optical fiber sensing technology, relate in particular to receiving subsystem and the method for supervising thereof of distributed optical fiber temperature sensing system.
Background technology
Distributed optical fiber sensing system principle is to utilize optical fiber cable as sensing responsive element and signal transmission medium simultaneously, adopt advanced optical time domain reflection (Optical Time-domain Reflectormetry, OTDR) technology, detect along the temperature of optical fiber diverse location and the variation of strain, realizing real distributed measurement, is a kind ofly can realize the system of big-length, large area region being carried out to Real-Time Monitoring.
Distributed fiber temperature sensing (DTS) system groundwork flow process is as follows, large power narrow pulse pulse laser produces Raman scattering dorsad (comprising Stokes and anti-Stokes etc.) while transmitting in optical fiber, then scattered light signal is carried out the processing such as opto-electronic conversion, signal amplification and signal condition, the simulating signal of handling, through data acquisition, is carried out further data processing and temperature demodulation by system software.
Receiving subsystem main functional modules generally comprises photoelectric conversion, signal amplifies and signal condition.Opto-electronic conversion realizes the reception of Raman scattering light signal and is translated into voltage or the current signal of being convenient to processing; Electric signal after photoelectric conversion module conversion is conventionally very faint, need to carry out at least amplification of hundred times to it, and this needs very high bandwidth and good gain flatness, otherwise can introduce distorted signals; Because needs carry out magnification at high multiple to signal, therefore must isolate direct current, be the mode that amplifying circuit must adopt AC coupling, signal condition is exactly, by matching network etc., signal is nursed one's health to reach the distorted signals problem that compensation AC coupling is brought.As can be seen here, receiving subsystem is directly connected to obtaining of raw sensory signal, and the index of its performance and stability are by the performance of direct decision systems and stability.
Current DTS system generally adopts the mode of dual channel receiver circuit, and every channel circuit is with the gain fixed, fixing APD high pressure (employing constant temperature oven) or automatically regulate the mode of APD high pressure (not adopting constant temperature oven) independently to work according to temperature.This mode can well be worked under normal conditions, but along with the lengthening of System production time, system just there will be the problem of hydraulic performance decline.In the situation of system in working long hours, device inevitably there will be to a certain degree aging, adds the impact of environment temperature, and system performance inevitably will decline.Specifically on receiving circuit, show as the change of APD gain-high pressure characteristics and amplifying circuit gain.In traditional DTS system, the method that this problem is generally carried out dynamic compensation by system software is solved.But in fact this method can not well be dealt with problems, because the variation of the system performance that the variation of receiving circuit characteristic brings, as the variation of APD gain, the gain of amplifying circuit, the variation of conditioning parameter etc., are to compensate by the method for software.The APD here (Avalanche PhotoDiode) refers to avalanche photodide.
Summary of the invention
The technical matters that the present invention mainly solves is to provide a kind of receiving subsystem for distributed optical fiber temperature sensing system and method for supervising thereof, this receiving subsystem is on the basis of original receiving circuit, by introducing subsystem monitors mechanism, realization is for real-time monitoring and the real-time adjustment to running parameter of subsystem work state, thereby assurance receiving subsystem is steady in a long-term, accurately operation.DTS system is as a kind of sensor-based system changing based on light intensity, and it is vital for the long-term accurate stable of strength signal, surveying.
In order to solve the problems of the technologies described above, the present invention adopts following technical scheme:
A kind of receiving subsystem for distributed optical fiber temperature sensing system, described distributed optical fiber temperature sensing system also comprises a master control system, and described receiving subsystem mainly comprises: APD and prime amplification module thereof, variable gain main amplifying circuit, high voltage control chip and Monitoring and Controlling module;
Described APD and prime amplification module thereof are connected with described variable gain main amplifying circuit, for the backscattering light signal receiving is converted to electric signal, and electric signal is tentatively amplified and nursed one's health, then this electric signal is exported to described variable gain main amplifying circuit; Described variable gain main amplifying circuit is for amplifying output by the electric signal receiving; Described high voltage control chip is connected with described APD and prime amplification module thereof, is used to APD that bias voltage is provided;
Described Monitoring and Controlling module is connected with described variable gain main amplifying circuit and high voltage control chip respectively, for monitoring on the one hand the yield value of described variable gain main amplifying circuit and the high-voltage value of described high voltage control chip output, on the other hand, described variable gain main amplifying circuit and high voltage control chip are regulated, thereby change its yield value, high-voltage value.
Further, described Monitoring and Controlling module comprises: MCU (micro-control unit) and the memory module being attached thereto, and described memory module is for storing the configuration information of yield value and high-voltage value; Wherein, described memory module comprises: FLASH storer.
Further, described APD and prime amplification module thereof comprise: trans-impedance amplifier, described APD and prime amplification module thereof are converted to the backscattering light signal receiving after current signal, then by described trans-impedance amplifier, described current signal are converted to voltage signal and tentatively amplify and nurse one's health.
Further, described variable gain main amplifying circuit comprises: variable gain amplifier (VGA, variable-gain amplifier).
Further, receiving subsystem of the present invention also comprises: the signal conditioning circuit being connected with described variable gain main amplifying circuit, for realizing the effective coupling to described variable gain main amplifying circuit, reduces the nonlinear distortion of output electrical signals.
Further, receiving subsystem of the present invention also comprises: the chip temperature being connected with described Monitoring and Controlling module, for the working temperature of Real-Time Monitoring receiving subsystem, and by this working temperature data upload to described Monitoring and Controlling module.
Further, receiving subsystem of the present invention also comprises: the information transmission interface being connected with described Monitoring and Controlling module, for uploading yield value, high-voltage value and working temperature data to described master control system on the one hand, on the other hand, receive instruction and configuration information that described master control system sends, make described Monitoring and Controlling module carry out corresponding operating, and described variable gain main amplifying circuit and high voltage control chip are regulated, thereby change its yield value, high-voltage value.
In addition, the present invention also provides the method for supervising of above-mentioned receiving subsystem, and it comprises the following steps:
A. described Monitoring and Controlling module regulates described variable gain main amplifying circuit and high voltage control chip according to the configuration information of the yield value storing in its memory module and high-voltage value;
B. the described Monitoring and Controlling module monitors yield value of described variable gain main amplifying circuit and the high-voltage value of described high voltage control chip output after regulating, and read the working temperature data that chip temperature monitors, then by this yield value, high-voltage value and working temperature data upload to master control system;
C. the configuration information that described Monitoring and Controlling module is sent according to described master control system regulates described variable gain main amplifying circuit and high voltage control chip, thereby changes its yield value, high-voltage value, preserves this configuration information simultaneously;
D. corresponding operating is carried out in the instruction that described Monitoring and Controlling module is sent according to described master control system.
Compared to prior art, beneficial effect of the present invention is:
In the receiving circuit module of conventional DTS system, generally only comprise APD and before put, high pressure chip, fixed gain amplifying circuit and signal conditioning circuit.The present invention improves existing receiving circuit module by introducing APD high pressure, circuit gain monitoring and adjustment module, in improved system, adopt VGA to change fixed gain amplifying circuit into variable-gain amplification circuit, change high pressure chip into high voltage control chip, and introduce Monitoring and Controlling module and the chip temperature being formed by MCU, ROM, RAM and FLASH.
MCU can be according to FLASH data initialization VGA and high voltage control chip, and the information such as current gain, high-voltage value and system temperature are uploaded by information transmission interface, and receive instruction change VGA and high-voltage value by information transmission interface, more amended configuration information is stored in FLASH in due course.MCU can also enter automatic adjusting pattern according to the instruction of master control system, guarantees the gain stabilization of APD and main amplifying circuit, and uploads in real time parameter information.When this subsystem in the situation that run duration starts to occur to a certain degree aging, during system output signal generation significant change, master control system can carry out a series of interlock with receiving subsystem, find out current most suitable parameter configuration, and this parameter configuration is passed to receiving subsystem, receiving subsystem enters automatic adjusting pattern again according to this parameter configuration.
Wherein MCU mainly can have following function: one, accept the configuration of DTS master control system and control the state of also uploading as required receiving subsystem; Two, from FLASH, preserve and read receiving subsystem each several part configuration information; Three, read the working temperature of receiving subsystem; Four,, according to configuration information and working temperature, high voltage control chip, VGA are monitored.
In sum, receiving subsystem of the present invention, under the control and management of MCU, can be realized the data sharing with master control system, accepts the dynamic-configuration of master control system, completes the foundation of control loop.By this intelligent receiving subsystem, master control system can be adjusted according to image data Real-time Feedback the running parameter of receiving subsystem, thereby long-term accurate, the steady operation that guarantees receiving subsystem, also guaranteed the long-term high-performance stable operation of whole DTS system.
Description of the invention and application are illustrative, not want by scope restriction of the present invention in the above-described embodiments.Here the distortion of disclosed embodiment and change is possible, and for those those of ordinary skill in the art, the various parts of the replacement of embodiment and equivalence are known.Those skilled in the art are noted that in the situation that not departing from spirit of the present invention or essential characteristic, and the present invention can realize with other forms.In the situation that not departing from the scope of the invention and spirit, can carry out other distortion and change to disclosed embodiment here.
Accompanying drawing explanation
Fig. 1 is the composition schematic diagram of receiving subsystem of the present invention;
Fig. 2 is the operational flow diagram of DTS system in embodiment.
Embodiment
Below in conjunction with accompanying drawing, further describe specific embodiments of the invention:
Distributed optical fiber temperature sensing system is a kind of light, mechanical, electrical high-tech equipment that integrates, and generally comprises the compositions such as large power narrow pulse laser module, passive optical module, receiver module, data processing module, common interface module, alarm output module, channel switching module, data acquisition module, environment monitoring module, power module, master control system.In order to realize the combination of each subsystem of DTS, can between each subsystem, add communication bus, interconnected with master control system, receive configuration and the control of master control system, to master control system feedback operation state.
Receiving subsystem for distributed optical fiber temperature sensing system of the present invention, as shown in Figure 1, mainly comprises: APD and prime amplification module 1 thereof, variable gain main amplifying circuit 2, high voltage control chip 3 and Monitoring and Controlling module 4.
Described APD and prime amplification module 1 thereof are connected with described variable gain main amplifying circuit 2, for the backscattering light signal receiving is converted to electric signal, and electric signal is tentatively amplified and nursed one's health, then this electric signal is exported to described variable gain main amplifying circuit 2.Described variable gain main amplifying circuit 2 is for exporting stable amplification of the electric signal receiving.Described high voltage control chip 3 is connected with described APD and prime amplification module 1 thereof, is used to APD that bias voltage is provided, and bias voltage directly affects APD transformation efficiency and multiplication factor.Described Monitoring and Controlling module 4 is connected with described variable gain main amplifying circuit 2 and high voltage control chip 3 respectively, for monitoring on the one hand the yield value of described variable gain main amplifying circuit 2 and the high-voltage value of described high voltage control chip 3 outputs, on the other hand, described variable gain main amplifying circuit 2 and high voltage control chip 3 are regulated, thereby change its yield value, high-voltage value.
Wherein, described Monitoring and Controlling module 4 comprises: MCU (micro-control unit) and the memory module being attached thereto, and described memory module is for storing the configuration information of yield value and high-voltage value, and it can comprise: the storeies such as FLASH, ROM, RAM.
Described APD and prime amplification module 1 thereof comprise: trans-impedance amplifier, described APD and prime amplification module 1 thereof are converted to the backscattering light signal receiving after current signal, then by described trans-impedance amplifier, described current signal are converted to voltage signal and tentatively amplify and nurse one's health.
Described variable gain main amplifying circuit 2 comprises: variable gain amplifier (VGA, variable-gainamplifier).
As preferred version of the present invention, receiving subsystem of the present invention also comprises: the signal conditioning circuit 5 being connected with described variable gain main amplifying circuit 2, for realizing the effective coupling to described variable gain main amplifying circuit 2, reduce the nonlinear distortion of output electrical signals, be distributed in the simulation part of receiving subsystem.Receiving subsystem of the present invention also comprises: the chip temperature 6 being connected with described Monitoring and Controlling module 4, for the working temperature of Real-Time Monitoring receiving subsystem, and by this working temperature data upload to described Monitoring and Controlling module 4.
The receiving subsystem of above-mentioned distributed optical fiber sensing system, mainly comprises four kinds of interfaces, i.e. power supply, optical fiber, signal output and communication.Wherein power interface is the required power interface of subsystem; Optical fiber interface is used for connecting DTS system Raman scattering passage; Signal output interface is general and DTS acquisition subsystem is interconnected; Information transmission interface is actually a kind of communication interface, for accessing DTS system communication bus, carries out the send and receive of information.
Wherein, described information transmission interface is connected with Monitoring and Controlling module 4, on the one hand, to described master control system, upload yield value, high-voltage value and working temperature data, on the other hand, receive instruction and configuration information that described master control system sends, make described Monitoring and Controlling module 4 carry out corresponding operating, and described variable gain main amplifying circuit 2 and high voltage control chip 3 are regulated, thereby change its yield value, high-voltage value.
The method for supervising of above-mentioned receiving subsystem, comprises the following steps:
A. described Monitoring and Controlling module 4, according to the configuration information of the yield value storing in its memory module and high-voltage value, regulates described variable gain main amplifying circuit 2 and high voltage control chip 3;
B. described Monitoring and Controlling module 4 is monitored the yield value of the described variable gain main amplifying circuit 2 after regulating and the high-voltage value of described high voltage control chip 3 outputs, and read the working temperature data that chip temperature 6 monitors, then by this yield value, high-voltage value and working temperature data upload to master control system;
C. the configuration information that described Monitoring and Controlling module 4 is sent according to described master control system regulates described variable gain main amplifying circuit 2 and high voltage control chip 3, thereby changes its yield value, high-voltage value, preserves this configuration information simultaneously;
D. corresponding operating is carried out in the instruction that described Monitoring and Controlling module 4 is sent according to described master control system.
Wherein, the MCU of the master control system of DTS system by system bus and information transmission interface and receiving subsystem realizes interconnected, to MCU, sends configuration and control information and receives MCU about the duty of receiving subsystem each several part.As shown in Figure 2, the specific works flow process of the DTS system in the present embodiment is as follows:
The operation of 1.DTS system, reads receiving subsystem configuration information;
2. receiving subsystem MCU reads local configuration information;
3.MCU reads receiving subsystem working temperature, reads the execution of the flow process that works in normal situation in working temperature;
4. master control system is set up and the linking of receiving subsystem, and reads receiving subsystem work state information, and according to status information adjustment System workflow (report an error, report to the police or normally move etc.).By demand download configuration information, and under normal condition, start receiving subsystem work.
5.MCU, according to working temperature and configuration information, regulates high voltage control chip output offset voltage and VGA gain, preserves adjusting information simultaneously;
6. the regularly execution of repeating step 5, and wait for the instruction of master control system, according to instruction, carry out associative operation.
Claims (8)
1. the receiving subsystem for distributed optical fiber temperature sensing system, described distributed optical fiber temperature sensing system also comprises a master control system, it is characterized in that, described receiving subsystem comprises: avalanche photodide APD and prime amplification module (1) thereof, variable gain main amplifying circuit (2), high voltage control chip (3) and Monitoring and Controlling module (4);
Described avalanche photodide APD and prime amplification module (1) thereof are connected with described variable gain main amplifying circuit (2), for the backscattering light signal receiving is converted to electric signal, and electric signal is tentatively amplified and nursed one's health, then this electric signal is exported to described variable gain main amplifying circuit (2); Described variable gain main amplifying circuit (2) is for amplifying output by the electric signal receiving; Described high voltage control chip (3) is connected with described avalanche photodide APD and prime amplification module (1) thereof, is used to avalanche photodide APD that bias voltage is provided;
Described Monitoring and Controlling module (4) is connected with described variable gain main amplifying circuit (2) and high voltage control chip (3) respectively, for monitoring on the one hand the yield value of described variable gain main amplifying circuit (2) and the high-voltage value of described high voltage control chip (3) output, on the other hand, described variable gain main amplifying circuit (2) and high voltage control chip (3) are regulated, thereby change its yield value, high-voltage value.
2. the receiving subsystem for distributed optical fiber temperature sensing system according to claim 1, it is characterized in that: described Monitoring and Controlling module (4) comprising: MCU and the memory module being attached thereto, described memory module is for storing the configuration information of yield value and high-voltage value.
3. the receiving subsystem for distributed optical fiber temperature sensing system according to claim 2, is characterized in that: described memory module comprises FLASH storer.
4. the receiving subsystem for distributed optical fiber temperature sensing system according to claim 1, it is characterized in that: described avalanche photodide APD and prime amplification module (1) thereof comprising: trans-impedance amplifier, described avalanche photodide APD and prime amplification module (1) thereof are converted to the backscattering light signal receiving after current signal, then by described trans-impedance amplifier, described current signal are converted to voltage signal and tentatively amplify and nurse one's health.
5. the receiving subsystem for distributed optical fiber temperature sensing system according to claim 1, is characterized in that: described variable gain main amplifying circuit (2) comprises variable gain amplifier.
6. the receiving subsystem for distributed optical fiber temperature sensing system according to claim 1, it is characterized in that: also comprise the signal conditioning circuit (5) being connected with described variable gain main amplifying circuit (2), for realizing the effective coupling to described variable gain main amplifying circuit (2), reduce the nonlinear distortion of output electrical signals.
7. the receiving subsystem for distributed optical fiber temperature sensing system according to claim 1, it is characterized in that: also comprise the chip temperature (6) being connected with described Monitoring and Controlling module (4), for the working temperature of Real-Time Monitoring receiving subsystem, and by this working temperature data upload to described Monitoring and Controlling module (4).
8. the receiving subsystem for distributed optical fiber temperature sensing system according to claim 1, it is characterized in that: also comprise the information transmission interface being connected with described Monitoring and Controlling module (4), for uploading yield value, high-voltage value and working temperature data to described master control system on the one hand, on the other hand, receive instruction and configuration information that described master control system sends, make described Monitoring and Controlling module (4) carry out corresponding operating, and described variable gain main amplifying circuit (2) and high voltage control chip (3) are regulated, thereby change its yield value, high-voltage value.
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| CN101344440A (en) * | 2008-08-28 | 2009-01-14 | 上海华魏自动化设备有限公司 | Automatic temperature calibration type distributed optical fiber temperature measurement sensing equipment and its use method |
| CN101344441A (en) * | 2008-08-28 | 2009-01-14 | 上海华魏自动化设备有限公司 | Multicenter simultaneously monitored distribution type optical fiber sensing equipment |
| CN201269789Y (en) * | 2008-10-23 | 2009-07-08 | 南京工业职业技术学院 | Electric system switch cabinet parameter on-line monitoring apparatus based on optical fiber sensor technique |
| CN101666689A (en) * | 2009-09-27 | 2010-03-10 | 上海华魏光纤传感技术有限公司 | Wavelength optimization-type high-performance distributed optical fiber sensing system and sensing method |
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| KR100567887B1 (en) * | 2003-12-04 | 2006-04-04 | 엘에스전선 주식회사 | Apparatus and Method for Analysis of Electric Power Transmission Link Status Having Function of Real-Time Evaluating Thermal Parameters Outside the Link |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101344440A (en) * | 2008-08-28 | 2009-01-14 | 上海华魏自动化设备有限公司 | Automatic temperature calibration type distributed optical fiber temperature measurement sensing equipment and its use method |
| CN101344441A (en) * | 2008-08-28 | 2009-01-14 | 上海华魏自动化设备有限公司 | Multicenter simultaneously monitored distribution type optical fiber sensing equipment |
| CN201269789Y (en) * | 2008-10-23 | 2009-07-08 | 南京工业职业技术学院 | Electric system switch cabinet parameter on-line monitoring apparatus based on optical fiber sensor technique |
| CN101666689A (en) * | 2009-09-27 | 2010-03-10 | 上海华魏光纤传感技术有限公司 | Wavelength optimization-type high-performance distributed optical fiber sensing system and sensing method |
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