CN101245899A - Signal detection device in full optical fiber perturbation sensing and fixing network system - Google Patents
Signal detection device in full optical fiber perturbation sensing and fixing network system Download PDFInfo
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Abstract
The invention provides a signal detection device in an all-fibre disturbance sensing and positioning network system, relating to the fire sensing detection technical field, in particular to a weak signal detection device for safely monitoring perimeter security. The output terminal of the transmission module of the signal to be detected of the invention is connected with the input terminal of a photoelectric converter and transmits the optical signal to be detected to the photoelectric converter; the output terminal of the photoelectric converter is connected with the input terminal of a preamplifier and converts the optical signal to be detected into electric signal; the output terminal of the preamplifier is connected with the input terminal of a selection filter and amplifies the electric signal and filtrates partial noises; the output terminal of the selection filter is connected with the input terminal of a phase-locked amplifier; the output terminal of the phase-locked amplifier is connected with the input terminal of a computer characteristic analysis system; the electric signal is amplified with noises filtrated by the phase-locked amplifier and is then transmitted to the computer characteristic analysis system. The signal detection device in the full fibre disturbance sensing and positioning network system realizes the objects of high sensitiveness, simple structure, long monitoring distance and precise positioning.
Description
Technical field
The present invention relates to the technical field that Fibre Optical Sensor detects, relate in particular to the pipe monitoring of all kinds of conveying danger or high value chemicals pipe safety monitoring etc., and the monitoring in important warehouse, storehouse, important boat station, hangar, Explosive storehouse, national boundary, Aeronautics and Astronautics base, missile base, bank, museum, prison etc.; City tap-water, coal gas, rock gas, heat supply pipeline safety monitoring monitoring; Apparatus for detecting weak signal in the full optical-fiber intelligent defence system of circumference safety guards such as oil, Long-distance Transmission Pipeline safety monitoring monitoring.
Background technique
Now along with the greatly developing of social security, various safety monitoring devices emerge in an endless stream.Outdoor perimeter intrusion detecting device is the prober that is used for the monitoring of outdoor large size border, and it is subjected to noting widely paying attention in recent years.
Characteristics such as for example the oil gas long distance pipeline has that caliber is big, transportation range is long, discharge pressure is high and freight volume is big.Its starting point is generally built oil gas field in, and terminal point is departments such as refinery, petrochemical plant or oil depot.In case long distance pipeline system on the way has an accident, cause serious consequence not only for pipe-line system itself, and have serious consequences for society and environment.Along with increasing of pipeline, manage the growth in age, because factors such as corrosive pipeline, natural disaster and artificial damage make the pipe safety problem become serious day by day.The pipe safety accident not only can influence normally carrying out of line transportation, and when carrying toxic, inflammable and explosive medium, causes huge threat also will for people's lives and properties and living environment.Therefore, accident discovery in time and the location that influences pipe safety had important practical significance.
In the monitoring defence system, monitored signal is submerged in the small-signal under the strong background noise often, and the Detection of Weak Signals module has fundamental influence to the performance of whole system.
" small-signal " means that not only the amplitude of signal is little, and mainly refers to the signal that is flooded by very noisy, and " faint " is for noise.In order to detect the small-signal that is covered by background noise, people have carried out long term research, analyze reason and rule that noise produces, the statistical property of characteristics, coherence and the noise of research measured signal is to seek out the method that detects useful signal from background noise.The Detection of Weak Signals technology is widely applied at spectroscopy, physics, chemistry, astronomy, optical communication, radar, sonar and biomedical engineering field.The method of Detection of Weak Signals commonly used has methods such as narrow-band filtering, Sampling Integral, coherent detection, triple correlation coupling, accidental resonance, chaos oscillator, wavelet transformation at present.Can detect the Detection of Weak Signals instrument of useful signal in background noise, for modern science and technology and industrial and agricultural production provide strong means of testing, application area spreads all over nearly all scientific domain, has become the common instrument of modern science and technology indispensability.
The top priority of Detection of Weak Signals technology is to improve signal to noise ratio, this just needs to adopt electronics, information theory, computer and physical method, so that from very noisy, detect useful small-signal, thereby satisfy the needs of modern scientific research and technical development.The Detection of Weak Signals technology is different from general detection technique, what it was paid attention to is not physical model and sensing principle, corresponding signaling conversion circuit and the instrument implementation method of sensor, but how to suppress noise and improve signal to noise ratio, therefore we can say that Detection of Weak Signals is a special technology that suppresses noise.
For various faint measured, the for example low light level, weak magnetic, little displacement, little electric capacity, micrometeor, minute-pressure power, little vibration, tepor difference etc., generally all be to be converted into little electric current or low voltage, amplify its amplitude through amplifier again and reach the measured size of expection by corresponding sensor.But, because measured weak output signal, the interference noise in the inherent noise of the Background noise of sensor, amplification circuit and surveying instrument and the external world is often much bigger than the amplitude of useful signal, amplify the process of measured signal and also amplified noise simultaneously, and will inevitably add some extra noises, therefore for example inside inherent noise of amplifier and the influence of various external disturbance only can not come out Detection of Weak Signals by amplification.Only under the condition that suppresses noise effectively, increase the amplitude of small-signal, just can extract useful signal.In order to reach such purpose, must study Detection of Weak Signals theory, method and apparatus.The purpose of Detection of Weak Signals is to extract useful signal from very noisy, or improves the signal to noise ratio of detection system output signal with some new technologies and new method.To the Detection of Weak Signals Study on Theory, explore new small-signal background technique detecting method, developing new Detection of Weak Signals equipment is a focus in present detection technique field.
Summary of the invention
Technical problem: the object of the invention provides a kind of detectivity height, and is simple in structure, is fit to various occasions, and monitoring distance is long, and can accurately locate; Anti-electromagnetic interference, anticorrosive, can under rugged environment, work; But the signal supervisory instrument in all-optical fiber disturbance sensing that reuse is strong and the fixer network system.
Technological scheme: the present invention adopts following technological scheme:
This detection device comprises: detected signal transmission module, photoelectric conversion device, preamplifier, frequency-selecting filter, lock-in amplifier, computer characteristic analytical system; The output terminal of above-mentioned detected signal transmission module is connected with the input end of photoelectric conversion device, and the detected light signal is sent on the photoelectric conversion device; The output terminal of above-mentioned photoelectric conversion device is connected with the input end of preamplifier, is to be sent to preamplifier behind the electrical signal with above-mentioned detected light signal conversion; The output terminal of above-mentioned preamplifier is connected with the input end of frequency-selecting filter, and above-said current signal is amplified and the filtering partial noise; The output terminal of frequency-selecting filter is connected with the input end of lock-in amplifier, the output terminal of above-mentioned lock-in amplifier is connected with the input end of computer characteristic analytical system, sends the computer characteristic analytical system to after above-said current signal is amplified through the lock-in amplifier denoising.
Reasonablely be: this detection device also comprises: data acquisition unit, DSP digital signal processor digital filtering, the output terminal of above-mentioned lock-in amplifier is connected with the input end of data acquisition unit, the output terminal of data acquisition unit is connected with the input end of DSP digital signal processor digital filtering, and the output terminal of DSP digital signal processor digital filtering is connected with the input end of computer characteristic analytical system; Above-mentioned electrical signal after amplifying through the lock-in amplifier denoising is sent to data acquisition unit and is converted to corresponding digital amount electrical signal and is sent in the DSP digital signal processor filtering, sends the computer characteristic analytical system to through the electrical signal after the DSP digital signal processor Shelving.
Reasonablely be: this detection device also comprises: monitoring display device in real time, and described real-time monitoring display device is connected with lock-in amplifier, DSP digital signal processor digital filtering respectively; Electrical signal after handling through lock-in amplifier, DSP digital signal processor digital filtering can be real-time be presented on the real-time monitoring display device, and by real-time monitoring display device lock-in amplifier, DSP digital signal processor digital filtering processing result are analyzed, in time adjust the frequency of okperation of lock-in amplifier, DSP digital signal processor digital filtering.
Reasonablely be: this detection device also comprises: demodulator, wavelength channel supervisory device, the output terminal of above-mentioned detected signal transmission module is connected with the input end of demodulator, the output terminal of described demodulator is connected with the input end of wavelength channel supervisory device, and the output terminal of above-mentioned wavelength channel supervisory device is connected with real-time monitoring display device; The detected light signal is sent to carries out demodulation in the demodulator, signal after the demodulation is transferred to respectively on photoelectric conversion device, the wavelength channel supervisory device, waveform after the wavelength channel supervisory device monitoring demodulation, and by real-time monitoring display device demonstration spectral characteristic, the monitoring display device is analyzed the monitored results of wavelength channel supervisory device in real time, in time adjusts the demodulator wavelength.
Beneficial effect: the present invention adopts technique scheme, compared with prior art has following advantage:
1, the present invention utilizes fiber-optical probe to replace pyroscan, magnetic field detectors or the leakage coaxial cable prober of original use.Pyroscan is subjected to the influence of weather condition easily, easily wrong report; Magnetic field detectors and leakage coaxial cable prober can not use under the electromagnetic interference serious environmental, and use fiber-optical probe just to avoid the situation of this respect, can not be subjected to the interference in weather, magnetic field, improved effect and the use occasion surveyed greatly, be particularly suitable for imbedding in ground and the body of wall.
2, the present invention utilizes fiber-optical probe to carry out perimeter detection, detection highly sensitive, simple in structure, and monitoring distance is long when surveying.The optical fiber price is very low, and being used for long distance detection has certain price advantage.
3, the present invention can realize accurate location; Anti-electromagnetic interference, anti-corrosion capacity are strong, can work under rugged environment simultaneously; But reuse is strong.
Description of drawings
Fig. 1 is a kind of structural representation of the present invention;
Fig. 2 is an another kind of structural representation of the present invention.
Among the figure: detected signal transmission module 101, demodulator 201, photoelectric conversion device 202, preamplifier 203, frequency-selecting filter 204, lock-in amplifier 205, data acquisition unit 206, DSP digital signal processor digital filtering 207, wavelength channel supervisory device 301, real-time monitoring display device 302, computer characteristic analytical system 401.
Embodiment
Below in conjunction with accompanying drawing the present invention is carried out detailed statement, as shown in Figure 1, this detection device comprises: detected signal transmission module 101, photoelectric conversion adorn 202, preamplifier 203, frequency-selecting filter 204, lock-in amplifier 205, computer characteristic analytical system 401; The output terminal of above-mentioned detected signal transmission module 101 is connected with the input end of photoelectric conversion device 202, and the detected light signal is sent on the photoelectric conversion device 202; The output terminal of above-mentioned photoelectric conversion device 202 is connected with the input end of preamplifier 203, is to be sent to preamplifier 203 behind the electrical signal with above-mentioned detected light signal conversion; The output terminal of above-mentioned preamplifier 203 is connected with the input end of frequency-selecting filter 204, and above-said current signal is amplified and the filtering partial noise; The output terminal of frequency-selecting filter 204 is connected with the input end of lock-in amplifier 205, the output terminal of above-mentioned lock-in amplifier 205 is connected with the input end of computer characteristic analytical system 401, sends computer characteristic analytical system 401 to after above-said current signal is amplified through lock-in amplifier 205 denoisings.
As shown in Figure 2, this detection device also comprises: data acquisition unit 206, DSP digital signal processor digital filtering 207, the output terminal of above-mentioned lock-in amplifier 205 is connected with the input end of data acquisition unit 206, the output terminal of data acquisition unit 206 is connected with the input end of DSP digital signal processor digital filtering 207, and the output terminal of DSP digital signal processor digital filtering 207 is connected with the input end of computer characteristic analytical system 401; Above-mentioned electrical signal after amplifying through lock-in amplifier 205 denoisings is sent to data acquisition unit 206 and is converted to corresponding digital amount electrical signal and is sent in the DSP digital signal processor filtering 207, and the electrical signal after handling through DSP digital signal processor filtering 207 sends computer characteristic analytical system 401 to.
As shown in Figure 2, this detection device also comprises: real-time monitoring display device 302, and described real-time monitoring display device 302 is connected with lock-in amplifier 205, DSP digital signal processor digital filtering 207 respectively; Electrical signal after handling through lock-in amplifier 205, DSP digital signal processor digital filtering 207 can be real-time be presented on the real-time monitoring display device 302, and analyze by 302 pairs of lock-in amplifiers 205 of real-time monitoring display device, DSP digital signal processor digital filtering 207 processing result, in time adjust the frequency of okperation of lock-in amplifier 205, DSP digital signal processor digital filtering 207.
As shown in Figure 2, this detection device also comprises: demodulator 201, wavelength channel supervisory device 301, the output terminal of above-mentioned detected signal transmission module 101 is connected with the input end of demodulator 201, the output terminal of described demodulator 201 is connected with the input end of wavelength channel supervisory device 301, and the output terminal of above-mentioned wavelength channel supervisory device 301 is connected with real-time monitoring display device 302; The detected light signal is sent to carries out demodulation in the demodulator 201, signal after the demodulation is transferred to respectively on photoelectric conversion device 202, the wavelength channel supervisory device 301, waveform after the 301 monitoring demodulation of wavelength channel supervisory device, and by real-time monitoring display device 302 demonstration spectral characteristics, the monitored results of 302 pairs of wavelength channel supervisory devices 301 of monitoring display device is analyzed in real time, in time adjusts demodulator 201 wavelength.
Border guard system generally is made up of alarm sensor, transmission equipment, controlling alarm equipment, communications system.In order to prevent intrusion behavior, it is at first to gather weak one that Fibre Optical Sensor detects, and then optical signal is converted to electrical signal, and electrical signal is carried out obtaining required waveform spectrum after a series of processing are amplified, and send subsequent treatment and identification.
System schema is the optical fiber Bragg raster demodulation, and as Fig. 1, demodulator 201 is by the optical signal that can demodulate certain specific wavelength, and demodulator 201 utilizes the fiber grating demodulation principle.Fiber bragg grating is a kind of novel passive photonic device, and it is the index modulation of a kind of space periodicity of setting up in optical fiber, can change and control the dissemination of light in optical fiber.Commonly used a kind of be optical fiber Bragg raster, its cycle is generally 10
-1The μ m order of magnitude.When light beam entered optical fiber Bragg raster, satisfying the Bragg condition was that wavelength is λ
BThe light of=2n Λ will reflect, and crest (or trough) value appears in reflection (or transmission) spectrum at the bragg wavelength place.The demodulation wavelength can be monitored and shown spectral characteristics by real-time monitoring display device 302 by wavelength channel supervisory device 301, and the supervisory device feedback signal is adjusted the demodulator wavelength.
The present invention has utilized the cross-correlation test principle.Repetition period or the frequency of known input signal s (t) are correlated with the input signal that is mixed with noise n (t) with the repetition period reference signal r identical with input signal (t), and wherein t is a time variable.The cross-correlation function u of reference signal and input signal then
Xy(l) be:
Wherein l is a time variable, and T is the signal period, u
Xy(l), u
Sy(l) be respectively the correlation function of reference signal and signal to be detected and noise signal, because r (t) does not have coherence with n (t), their cross-correlation function is zero, then:
u
xy(l)＝u
sy(l) (2)
Just can detect signal s to be detected (t) after removing noise.
The present invention is by demodulator 201 and wavelength channel supervisory device 301, adjust the demodulator wavelength by the supervisory device feedback signal, again through the signalling channel of photoelectric conversion device 202 with preamplifier 203 formations, deliver to frequency-selecting filter 204 and lock-in amplifier 205 denoising modules through the signalling channel voltage signal processed, data acquisition unit 206 realizes that analog-to-digital conversion becomes digital signal with analog signal conversion, is handled real-time monitoring display device 302 monitoring and is fed back to lock-in amplifier 205 by DSP digital signal processor digital filtering 207 and adjust reference signal.In order to realize the function of zone fixed point, will dispose a series of fiber bragg grating in the sensed system, therefore need to detect the ripple signal, for this reason, faint optical signal enters before the photoelectric conversion device 202, separates 201 by demodulator earlier and goes out corresponding wavelength signals, delivers to photoelectric conversion device then.
The band-pass filter that frequency-selecting filter 204 usefulness low-pass filters of the present invention and high-pass filter combine, the break frequency of low-pass filter and the break frequency of high-pass filter are all adjustable, can select to set the CF center frequency and the bandwidth of band-pass filter like this according to the situation of measured signal.The bandwidth of band-pass filter can not be too narrow, otherwise when temperature and voltage change, the frequency spectrum of signal may depart from the passband of band-pass filter, causes very big measurement error.
Lock-in amplifier 205 of the present invention includes wave filter.Lock-in amplifier 205 is actually the Fourier transformer of a simulation, and the output of lock-in amplifier is a VDC, and being proportional to is the signal amplitude of a certain characteristic frequency in the input signal (parameter incoming frequency).And other frequency contents in the input signal can not constitute any contribution to output voltage.Even useful signal is submerged in the noise signal the inside,, just can measure the amplitude of this signal exactly as long as know the frequency values of useful signal.Therefore, lock-in amplifier is that native system is realized the key component that filtering noise, signal master amplify.
Data acquisition unit 206 of the present invention is realized that by high-speed a/d converter at first high-speed a/d converter is realized and can be described with two parameters: resolution and speed.Resolution represents that with position (bit) n position A/D converter is divided into 2n level with analogue signal, produces 2n independent digital output encoder.The needed resolution of A/D converter depends on the signal to noise ratio (snr) and/or the dynamic range requirement of system.
The speed of high-speed a/d converter is represented with millions of samplings of per second (Msamples/s) usually.Sampling rate that Here it is, or analogue signal can be converted to digital form continuously under which type of speed.Concerning great majority were used, sampling rate should be 3～4 times of A/D converter input signal highest frequency.
Resolution has been represented the quantity of the digital output encoder that A/D converter can produce really, but its and the whether genuine corresponding correct input voltage of not shown these codings.Such as differential nonlinearity (DifferentialNonlinearity-DNL), integral nonlinearity degree (Integral Nonlinearity-INL), deviation and full scale error equal error parametric description the levels of precision of output encoder response input voltage.
Digital filter is a discrete-time system, and input x (n) is a time series, and output y (n) also is a time series, and wherein n is a discrete-time series.System function as digital filter is H (z), and wherein z is a complex variable, is abscissa with its real part, and imaginary part is that the plane that y coordinate constitutes is a z-plane.Its impulsive phase should be h (n), then has following relationship in time-domain:
y(n)＝x(n)*h(n) (3)
In the z territory, there is following relationship in input and output:
Y(z)＝H(z)X(z) (4)
A suitable digital filter system function H (z) can change the frequency characteristic of input x (n) as required.Useful frequency content among signal y (n) the stick signal x (n) after digital filter is handled is removed the unwanted frequency composition.
DSP digital signal processor digital filtering 207 is special microprocessors of a kind of processing digital signal, is mainly used in the digital processing algorithm of realizing various signals real-time.Realize that with DSP chip digital filtering has good stability, validity height, advantage such as not affected by environment, the filtering result can be monitored by real-time monitoring display device.
The present invention is exactly the module of the denoising that combines of a kind of digital simulation, and the voltage signal that this module can become faint optical signal amplification after treatment send subsequent treatment to discern, and can feedback signal adjust denoising system.So just can realize weak one is detected, constitute the key modules of broad domain all-optical fiber disturbance sensing and fixer network system.
Claims (4)
1. the signal supervisory instrument in all-optical fiber disturbance sensing and the fixer network system, it is characterized in that: this detection device comprises: detected signal transmission module (101), photoelectric conversion device (202), preamplifier (203), frequency-selecting filter (204), lock-in amplifier (205), computer characteristic analytical system (401); The output terminal of above-mentioned detected signal transmission module (101) is connected with the input end of photoelectric conversion device (202), and the detected light signal is sent on the photoelectric conversion device (202); The output terminal of above-mentioned photoelectric conversion device (202) is connected with the input end of preamplifier (203), is to be sent to preamplifier (203) behind the electrical signal with above-mentioned detected light signal conversion; The output terminal of above-mentioned preamplifier (203) is connected with the input end of frequency-selecting filter (204), and above-said current signal is amplified and the filtering partial noise; The output terminal of frequency-selecting filter (204) is connected with the input end of lock-in amplifier (205), the output terminal of above-mentioned lock-in amplifier (205) is connected with the input end of computer characteristic analytical system (401), sends computer characteristic analytical system (401) to after above-said current signal is amplified through lock-in amplifier (205) denoising.
2, signal supervisory instrument in all-optical fiber disturbance sensing according to claim 1 and the fixer network system, it is characterized in that: this detection device also comprises: data acquisition unit (206), DSP digital signal processor digital filtering (207), the output terminal of above-mentioned lock-in amplifier (205) is connected with the input end of data acquisition unit (206), the output terminal of data acquisition unit (206) is connected with the input end of DSP digital signal processor digital filtering (207), and the output terminal of DSP digital signal processor digital filtering (207) is connected with the input end of computer characteristic analytical system (401); Above-mentioned electrical signal after amplifying through lock-in amplifier (205) denoising is sent to data acquisition unit (206) and is converted to corresponding digital amount electrical signal and is sent in the DSP digital signal processor filtering (207), and the electrical signal after handling through DSP digital signal processor filtering (207) sends computer characteristic analytical system (401) to.
3, the signal supervisory instrument in all-optical fiber disturbance sensing according to claim 2 and the fixer network system, it is characterized in that: this detection device also comprises: real-time monitoring display device (302), and described real-time monitoring display device (302) is connected with lock-in amplifier (205), DSP digital signal processor digital filtering (207) respectively; Electrical signal after handling through lock-in amplifier (205), DSP digital signal processor digital filtering (207) can be real-time be presented on the real-time monitoring display device (302), and by real-time monitoring display device (302) lock-in amplifier (205), DSP digital signal processor digital filtering (207) processing result are analyzed, in time adjust the frequency of okperation of lock-in amplifier (205), DSP digital signal processor digital filtering (207).
4, the signal supervisory instrument in all-optical fiber disturbance sensing according to claim 3 and the fixer network system, it is characterized in that: this detection device also comprises: demodulator (201), wavelength channel supervisory device (301), the output terminal of above-mentioned detected signal transmission module (101) is connected with the input end of demodulator (201), the output terminal of described demodulator (201) is connected with the input end of wavelength channel supervisory device (301), and the output terminal of above-mentioned wavelength channel supervisory device (301) is connected with real-time monitoring display device (302); The detected light signal is sent in the demodulator (201) carries out demodulation, signal after the demodulation is transferred to respectively on photoelectric conversion device (202), the wavelength channel supervisory device (301), waveform after wavelength channel supervisory device (301) the monitoring demodulation, and by real-time monitoring display device (302) demonstration spectral characteristic, monitoring display device (302) is analyzed the monitored results of wavelength channel supervisory device (301) in real time, in time adjusts demodulator (201) wavelength.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102109380A (en) * | 2009-12-24 | 2011-06-29 | 中国科学院福建物质结构研究所 | Open type low-temperature high-resolution ratio laser spectrum test system |
| CN102664604A (en) * | 2012-04-20 | 2012-09-12 | 西南交通大学 | Combined filtering algorithm for improving denoising performances of fiber grating sensor network demodulating systems |
| CN103033820A (en) * | 2013-01-10 | 2013-04-10 | 苏州恒知传感科技有限公司 | Optical cable identifying method and equipment |
| CN104791612A (en) * | 2015-03-23 | 2015-07-22 | 中国石油天然气集团公司 | Adaptive noise cancellation device applied to optical fiber early warning system |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1164886C (en) * | 2002-12-10 | 2004-09-01 | 西安交通大学 | Oil gas pipeline leak intelligent on line monitoring method based on distribution type optical fibre sensor |
| CN201166263Y (en) * | 2008-03-21 | 2008-12-17 | 东南大学 | Full optical fiber destabilization sensing weak signal detection module |
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2008
- 2008-03-21 CN CN2008100244867A patent/CN101245899B/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102109380A (en) * | 2009-12-24 | 2011-06-29 | 中国科学院福建物质结构研究所 | Open type low-temperature high-resolution ratio laser spectrum test system |
| CN102664604A (en) * | 2012-04-20 | 2012-09-12 | 西南交通大学 | Combined filtering algorithm for improving denoising performances of fiber grating sensor network demodulating systems |
| CN103033820A (en) * | 2013-01-10 | 2013-04-10 | 苏州恒知传感科技有限公司 | Optical cable identifying method and equipment |
| CN104791612A (en) * | 2015-03-23 | 2015-07-22 | 中国石油天然气集团公司 | Adaptive noise cancellation device applied to optical fiber early warning system |
| CN104791612B (en) * | 2015-03-23 | 2017-12-05 | 中国石油天然气集团公司 | A kind of adaptive noise cancelling arrangement being applied in optical fiber early warning system |
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