CN102393987B - Adaptive continuous-wave wide-dynamic-range signal processing method for wide-field full-optical fiber sensing system - Google Patents
Adaptive continuous-wave wide-dynamic-range signal processing method for wide-field full-optical fiber sensing system Download PDFInfo
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Abstract
The invention relates to an adaptive continuous-wave wide-dynamic-range signal processing method for a wide-field full-optical fiber sensing system. The method comprises the following steps that: a. an optical transmission module generates an optical signal and generates backward scattered light in sensing optical fiber; b. a photoelectric detector converts the received backward scattered light signal into a corresponding continuous-wave signal; c. a controllable gain amplifier in a signal acquisition module de-noises and amplifies the continuous-wave signal and then inputs the de-noised and amplified continuous-wave signal into a signal processor; and d. the signal processor compares the dynamic range of the continuous-wave signal with a preset threshold in the signal processor, the signal processor zooms the dynamic range of the continuous-wave signal when the dynamic range of the continuous-wave signal is matched with the preset threshold, and the signal processor inputs a gain control signal into the controllable gain amplifier so that the range of the continuous-wave signal which is input into the signal processor through the controllable gain amplifier keeps stable. By adopting the adaptive continuous-wave wide-dynamic-range signal processing method, signal detection and processing accuracy and stability can be improved.
Description
Technical field
The present invention relates to a kind of signal processing method, especially a kind of wide-field full-optical fiber sensor system continuous wave self-adaptation great dynamic range signal processing method belongs to the technical field of safety-protection system.
Background technology
Optical fiber sensing technology is that 20 century 70s are accompanied by the development of Fibre Optical Communication Technology and fast development is got up, and as carrier, optical fiber is as medium with light wave, the new technique of the extraneous measured signal of sensing.Put it briefly, Fibre Optical Sensor is exactly to utilize optical fiber with to be measured the light wave parameter that transmits in the optical fiber to be modulated, and the lightwave signal of modulated mistake is carried out the demodulation detection, thereby obtains a kind of measurement mechanism of quantity to be measured.
Light wave does not produce electromagnetic interference (EMI), is not afraid of electromagnetic interference (EMI) yet, easily is that various light-detecting devices receive, and can carry out easily the conversion of photoelectricity or electric light, is easy to be complementary with Modern Electronic device and the computing machine of high development.The fiber work bandwidth, dynamic range is large, is suitable on a large scale remote networking and remote measuring and controlling, is a kind of good low loss line; The electrical isolation of optical fiber own, volume is little, and is flexible, anti-electromagnetic interference (EMI), radioresistance, withstand voltage, corrosion-resistant, be particularly suitable for using under the rugged surroundings such as inflammable, explosive, narrow space and strong electromagnetic.Therefore, optical fiber sensing technology is subject to very big attention once coming out, and almost obtains research and uses in every field, becomes the guide of sensing technology, promotes the flourish of sensing technology.
The loss of optical fiber mainly comprise owing to fiber optic materials and impurity to the absorption of luminous energy cause the scattering loss (mainly referring to Rayleigh scattering) of absorption loss, inside of optical fibre, because interface distortion or the radiation loss that produces of the coarse scattering loss that produces, fibre-optical bending etc. at random, in these losses, the most important thing is the absorption loss of optical fiber.Because the impact of fibre loss, the variation range of continuous wave signal is generally very large, and signal can be several microvolts when weak, can severally lie prostrate when signal is strong, and the strongest and weak signal differs greatly.
The distributed optical fiber sensing device is to utilize an optical fiber as the sensing element that extends, any one section on the optical fiber is sensing unit, again the information transfer channel of other sensing unit, thus can obtain measured along this optical fiber in time with the distributed intelligence of spatial variations.It has eliminated the sensing " blind area " that traditional sensor-based system exists, and has fundamentally broken through the restriction of traditional spot measurement, is distributed fiberoptic sensor truly.The distributed optical fiber sensing device mainly contains two large classes: a class is based on the backward scattered optical time domain reflection of optical fiber (OTDR) technology, another kind of interference technique based on long distance.The distributed optical fiber sensing device utilizes an optical fiber to replace a large amount of discrete sensor, greatly reduces cost, and cost performance is very high, is widely used.
The wide-field full-optical fiber sensor system is to utilize optical fiber as a kind of distributed sensing system of sensor information, can be to carrying out long-range and real-time safety monitoring along the invasion in the fibre circuit scope.Because Distributed Optical Fiber Sensing Techniques can be realized the extraction of distributed intelligence in the large-range measuring field, thereby it can use many fields of measurement.Therefore, optical fiber sensing system is with a wide range of applications, and research and development have important economic worth and social effect based on the safety monitoring system of Fibre Optical Sensor.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, a kind of wide-field full-optical fiber sensor system continuous wave self-adaptation great dynamic range signal processing method is provided, it can improve accuracy and the stability of input, processing.
According to technical scheme provided by the invention, a kind of wide-field full-optical fiber sensor system continuous wave self-adaptation great dynamic range signal processing method, described signal processing method comprises the steps:
A, light emission module produce light signal, and described light signal is coupled into sensor fibre, and produces rear orientation light in sensor fibre;
B, receive the rear orientation light that sensor fibre produces by photodetector, photodetector is converted to corresponding continuous wave signal with the back scattering light signal that receives, and with described continuous wave signal input signal acquisition module;
Controllable gain amplifier in c, the signal acquisition module amplifies in the rear input signal processor the continuous wave signal denoising;
D, signal processor compare threshold value default in the dynamic range of continuous wave signal and the signal processor, when the dynamic range of continuous wave signal and predetermined threshold value scope are complementary, signal processor carries out convergent-divergent to the dynamic range of continuous wave signal, and signal processor is to controllable gain amplifier input gain conditioning signal, so that keep stable through the scope of continuous wave signal in the controllable gain amplifier input signal processor.
In the described steps d, signal processor is to relatively comprising of continuous wave signal the amplitude of continuous wave signal or peak value and predetermined threshold value being compared, so that continuous wave signal is carried out convergent-divergent.
When signal processor carried out the amplitude comparison to continuous wave signal, signal processor calculated the root-mean-square value of some continuous wave signals; When the root-mean-square value that calculates is positioned at the threshold range of setting, the signal processor continuous wave signal of not amplifying or decay; When root-mean-square value during less than setting threshold, signal processor amplifies the continuous wave signal value; When root-mean-square value during greater than setting threshold, signal processor decay continuous wave signal.
When signal processor to continuous wave signal carry out peakedness ratio than the time, when the peak value of continuous wave signal is positioned at the setting threshold scope, the signal processor continuous wave signal of not amplifying or decay; When the peak value of continuous wave signal during less than setting threshold, signal processor amplifies continuous wave signal; When the peak value of monitor signal during greater than setting threshold, signal processor decay continuous wave signal.
Described signal processor comprises FPGA.
Described light emission module comprises semiconductor laser, and the light path of described semiconductor laser is provided with automatically controlled variable optical attenuator, and described automatically controlled variable optical attenuator is coupled into light signal in the sensor fibre by circulator.
The output terminal of described signal processor links to each other with the control end of automatically controlled variable optical attenuator, signal processor according to continuous wave signal dynamically with the setting threshold comparative result to automatically controlled variable optical attenuator input attenuation conditioning signal, so that the light intensity of automatically controlled variable optical attenuator output keeps stablizing.
Described signal processor links to each other with host computer by the USB transmission interface, described host computer is to the monitoring electric signal pattern-recognition of signal processor input, can the invasion information that the monitoring electric signal comprises be shown early warning, the vibration source position of sensor fibre is located early warning and data storing queries.
Described controllable gain amplifier links to each other with the input end of signal processor by the A/D sampling card, and the output terminal of signal processor links to each other with the control end of controllable gain amplifier by D/A converter.
Described circulator is the 3dB photo-coupler.
Advantage of the present invention: semiconductor laser produces light signal after automatically controlled variable optical attenuator carries out light intensity attenuation, be coupled in the sensor fibre by circulator, the rear orientation light that sensor fibre produces is in circulator is coupled to photodetector, and controllable gain amplifier, fpga chip, A/D sampling card and D/A converter consist of adaptation control circuit; After fpga chip compares judgement to continuous wave signal, by the gain coefficient of adjustment controllable gain amplifier and the decay of automatically controlled variable optical attenuator, remarkable to the effect that improves scope that continuous wave signal detects and gather, stability, can effectively regulate continuous wave signal intensity, make continuous wave signal be received and to collect by FPGA better; Can be used in the monitoring and early warning safety-protection system, improve reliability and the stability of safety-protection system.
Description of drawings
Fig. 1 is the structured flowchart that the present invention uses state.
Fig. 2 is the waveform of continuous wave signal.
Fig. 3 is the self-adaptation high dynamic range control block diagram that the present invention is based on FPGA.
Fig. 4 is that signal processor of the present invention is to continuous wave signal self-adaptation process flow diagram relatively.
Fig. 5 is that signal processor of the present invention is to continuous wave signal self-adaptation another kind of process flow diagram relatively.
Description of reference numerals: 101-semiconductor laser, the automatically controlled variable optical attenuator of 102-, 103-circulator, 104-sensor fibre, 105-photo-detector, 106-controllable gain amplifier, 107-A/D sampling card, 108-D/A converter, 109-FPGA chip, 110-USB2.0 interface and 111-host computer.
Embodiment
The invention will be further described below in conjunction with concrete drawings and Examples.
The wide-field full-optical fiber sensor system can be used in safety monitoring and Disturbance Detection, the ultimate principle of light path sense vibration signal is: sensor fibre somewhere along the line produces vibration, cause the Microinhomogeneity of inside of optical fibre refractive index, so that the phase of light wave of propagating in the sensor fibre changes, by interfere measurement technique the phase place variation is transferred to light intensity again and change, thereby detect extraneous vibration.
Continuous wave signal is at the constant continuous light wave of miniwatt of light emission module emission, with the mirror signal of sensor fibre tail end as carrier signal, the signal that is received by interference technique again.Continuous wave signal is being carried the extraneous vibration signal characteristic, and frequency is lower, is generally tens hertz to several KHz, and the continuous wave signal waveform as shown in Figure 2; Because the fluctuation range of continuous wave signal is larger, therefore in order to improve stability and the reliability that continuous wave signal is processed, need to process continuous wave signal.
Because the fluctuation range of continuous wave signal is larger, can both stably be received in order to make continuous wave, just needs adaptation control circuit to regulate its range of receiving.Adaptive control can be regarded as an energy and regulates the feedback control system of self-characteristic so that system can be according to the standard operation of some settings at optimum state according to environmental change intelligence.The signal processing control circuit of self-adaptation high dynamic range can be in the situation that input signal amplitude alters a great deal, make amplitude output signal keep constant or only variation in more among a small circle, be unlikely to work because input signal is too little, also be unlikely to make signal processor occur saturated because input signal is too large or stop up.
As shown in Figure 1: for the present invention can carry out the large dynamic signal processing circuit of wide-field full-optical fiber sensor system continuous wave self-adaptation, described treatment circuit can be used in the monitoring and early warning safety-protection system.The large dynamic signal processing device of described wide-field full-optical fiber sensor system continuous wave self-adaptation mainly comprises transmitter module, sensing light path module, Optical Receivers, signal acquisition module, signal transmission module and signal processing module.Particularly, semiconductor laser 101 produces pump light signals, automatically controlled variable optical attenuator 102 is set on the light path of semiconductor laser 101, and the light signal that automatically controlled variable optical attenuator 102 is used for noise spectra of semiconductor lasers 101 generations carries out power attenuation to regulate light intensity.Automatically controlled variable optical attenuator 102 is coupled in the sensor fibre 104 by circulator 103, and circulator 103 is the 3dB photo-coupler, and sensor fibre 104 is for carrying out the sensing equipment of security protection or vibration monitoring.Light signal produces rear orientation light by sensor fibre 104 tail ends after entering sensor fibre 104, and rear orientation light is coupled to photodetector 105 through circulator 103 again and carries out opto-electronic conversion, after prime is amplified, and the photodetection work of settling signal.The output terminal of photodetector 105 links to each other with controllable gain amplifier 106, described controllable gain amplifier 106 links to each other with signal processor by A/D sampling card 107, the output terminal of signal processor links to each other with host computer 111 by USB transmission interface 110, signal processor links to each other with the control end of controllable gain amplifier 106 by D/A converter 108, be used for regulating the gain coefficient of controllable gain amplifier 106, the output terminal of signal processor and automatically controlled variable optical attenuator 102 are used for regulating automatically controlled variable optical attenuator 102 noise spectra of semiconductor lasers 101 decay light intensity.In order to improve sampling and processing speed, signal processor adopts fpga chip (Field-Programmable Gate Array) 109.Semiconductor laser 101, automatically controlled variable optical attenuator 102 and circulator 103 consist of light emission module, sensor fibre 104 consists of sensing light path module, circulator 103 and photodetector 105 consist of Optical Receivers, controllable gain amplifier 106, A/D sampling card 107, D/A converter 108 and fpga chip 109 consist of signal acquisition module (also being adaptation control circuit), usb 1 10 consists of signal transmission module, host computer 111 consists of signal processing module, thereby forms whole safety monitoring early warning system based on wide-field full-optical fiber.
The effect of the signal processing control circuit of self-adaptation high dynamic range is: when the signal voltage of photo-detector 105 inputs alters a great deal, keep controllable gain amplifier 106 output voltages constant or substantially constant.Specifically, when input signal was very weak, the gain of controllable gain amplifier 106 was large, and adaptation control circuit is inoperative; When input signal was very strong, adaptation control circuit was controlled, and the gain of controllable gain amplifier 106 is reduced.Like this, when received signal strength changed, the voltage of the output terminal of controllable gain amplifier 106 or power were substantially constant or keep constant.Therefore to the requirement of adaptation control circuit be: at input signal hour, adaptation control circuit is inoperative, only has after input signal increases to a certain degree, and adaptation control circuit just plays control action, and gain is reduced with the increase of input signal.
According to signal processing circuit structure shown in Figure 1, wide-field full-optical fiber sensor system continuous wave self-adaptation great dynamic range signal processing method of the present invention comprises the steps:
A, light emission module produce light signal, and described light signal is coupled into sensor fibre 104, and at sensor fibre 104 interior generation rear orientation lights;
B, receive the rear orientation light that sensor fibres 104 produce by photodetector 105, photodetector 105 is converted to corresponding continuous wave signal with the back scattering light signal that receives, and with described continuous wave signal input signal acquisition module; Continuous wave signal is digital signal level herein;
After amplifying, 106 pairs of continuous wave signal denoisings of controllable gain amplifier in c, the signal acquisition module input in the fpga chip 109;
D, fpga chip 109 compare dynamic range and the fpga chip 109 interior default threshold values of continuous wave signal, when the dynamic range of continuous wave signal and predetermined threshold value scope are complementary, the dynamic range of 109 pairs of continuous wave signals of fpga chip is carried out convergent-divergent, and fpga chip 109 is to controllable gain amplifier input gain conditioning signal, so that keep stable through the scope of controllable gain amplifier 106 input fpga chips 109 interior continuous wave signals, so that the scope that fpga chip 109 devices are inputted continuous wave signal to host computer keeps stable.
For realizing above-mentioned treatment step, an energy must be arranged with strong and weak control voltage or the current signal that changes of extraneous signal, utilize this signal that the Gain Automatic of controllable gain amplifier 106 controlled.The signal processing controls loop of self-adaptation high dynamic range is made of controllable gain amplifier 106, A/D sampling card 107, fpga chip 109 and D/A converter 108.To realize the self-adaptation high dynamic range by fpga chip 109 controls, must detect first the estimated value of continuous wave signal amplitude or power.
In the described steps d, relatively comprising of 109 pairs of continuous wave signals of fpga chip compares the amplitude of continuous wave signal or peak value and predetermined threshold value, so that continuous wave signal is carried out convergent-divergent; The concrete comparison determination methods flow process of fpga chip 109 as shown in Figure 4 and Figure 5.
As shown in Figure 4: when 109 pairs of continuous wave signals of fpga chip were carried out the amplitude comparison, fpga chip 109 calculated the root-mean-square value of some continuous wave signals; When the root-mean-square value that calculates is positioned at the threshold range of setting, fpga chip 109 continuous wave signal of not amplifying or decay; When root-mean-square value less than setting threshold under in limited time, fpga chip 109 amplifies the continuous wave signal values; When root-mean-square value during greater than the setting threshold higher limit, fpga chip 109 decay continuous wave signals.After 109 pairs of continuous wave signals of fpga chip are amplified or are decayed, fpga chip 109 is to the control end feedback gain adjustment signal of controllable gain amplifier 106, can so that the gain coefficient of controllable gain amplifier 106 keeps stable, improve controllable gain amplifier 106 to the stability of fpga chip 109 input continuous wave signals by the gain-adjusted signal.
As shown in Figure 5: when 109 pairs of continuous wave signals of fpga chip carry out peakedness ratio than the time, fpga chip 10 gathers the peak value of several continuous wave signals, and takes out the foundation that the maximal value in the described peak value is judged as a comparison; When the peak value of continuous wave signal is positioned at the setting threshold scope, fpga chip 109 continuous wave signal of not amplifying or decay; When the peak value of continuous wave signal during less than setting threshold, fpga chip 109 amplifies continuous wave signals; When the peak value of monitor signal during greater than setting threshold, fpga chip 109 decay continuous wave signals.After 109 pairs of continuous wave signals of fpga chip are amplified or are decayed, fpga chip 109 is to the control end feedback gain adjustment signal of controllable gain amplifier 106, can so that the gain coefficient of controllable gain amplifier 106 keeps stable, improve controllable gain amplifier 106 to the stability of fpga chip 109 input continuous wave signals by the gain-adjusted signal.
Because feedback fraction fpga chip 109 feeds back to the control end of controllable gain amplifier 106 among the present invention by D/A converter 108, whole process is realized by numerical approach, so that complicated control requirement can easier realize, so have the advantages such as Fast Convergent and accurate steady-state response.Fpga chip 109 interior judgement predetermined threshold value can arrange according to voltage range, fpga chip 109 is judged the scope of the continuous wave signal of controllable gain amplifier 106 inputs continuously, fpga chip 109 select to adopt root-mean-square values relatively or peakedness ratio than determination methods, so that the gain coefficient of controllable gain amplifier 106 is regulated, so that the follow-up continuous wave signal that enters in the fpga chip 109 keeps stable.
Automatically controlled variable optical attenuator 102(EVOA) be one of the most basic passive device, significant for the power equalization in the system optical signal.In the present invention, automatically controlled variable optical attenuator 102 can be used to regulate light intensity.The Lookup protocol process of decay is: the voltage transitions of controllable gain amplifier 106 being exported by A/D sampling card 107 becomes digital signal, then fpga chip 109 is decayed according to the corresponding continuous wave signal of setting threshold scope, compare with the desired value of having set in the fpga chip 109, come to finish the automatic Attenuation adjustable of automatically controlled variable optical attenuator 102 to automatically controlled variable optical attenuator 102 output control signals according to result relatively.The desired value of fpga chip 109 interior settings is relevant with the voltage of controllable gain amplifier 106 inputs, determines the attenuation amplitude of automatically controlled variable optical attenuator 102 according to the comparative result of input voltage.
As shown in Figure 3: be the signal processing control circuit principle of self-adaptation high dynamic range of the present invention.Front end signal connects controllable gain amplifier 106, the output terminal of signal is connected to the input port of A/D sampling card 107, analog quantity is become digital quantity, digital quantity is deposited in the storer in the fpga chip 109, realize that each section period calculates sampled point, the amplitude range of decision signal, thereby the amplification coefficient of definite gain.After fpga chip 109 calculates the amplification coefficient of gain, control signal is converted to analog quantity by D/A converter 108, the control end of access controllable gain amplifier 106 is realized the adaptive control of continuous wave.Analog electrical signal is delivered to the input end of A/D sampling card 107 again through after the control of controllable gain amplifier 106, becomes its effective input.
Specific embodiment:
Be used for safety-protection system as example take sensor fibre 104, in the adaptive control loop, D/A converter 108 uses the TLV5618D/A converter, and controllable gain amplifier 106 uses the AD623 gain variable amplifier, and A/D sampling card 107 uses the AD9203A/D sampling A/D chip.Semiconductor laser described in the light path system 101, automatically controlled variable optical attenuator 102, circulator 103, sensor fibre 104, photodetector 105 are city's pin product.
Send laser by semiconductor laser 101, carry out the adjusting that the power variable decay realizes light intensity through automatically controlled variable optical attenuator 102.Then be transferred to circulator (coupling mechanism) 103 and be coupled into sensor fibre 104, the reflection wave of returning from sensor fibre 104 tail ends is the carrier wave of transducing signal, be admitted to photodetector 105 and carry out opto-electronic conversion and prime amplification, obtain corresponding electric signal, inputing to controllable gain amplifier 106.Fpga chip 109 is realized the amplitude range of continuous wave is controlled by D/A converter 108 control controllable gain amplifiers 106, and continuous wave is received better by fpga chip 109.Fpga chip 109 is master controllers of acquisition system, has obtained the instruction of host computer 111, and fpga chip 109 just makes acquisition system be in correct duty according to these instructions, the collection of control signal, buffer memory, and with information and data feedback to host computer; Usb 1 10 is transmission interfaces, and host computer 111 conveys to the order of fpga chip 109 and the data that fpga chip 109 sends host computer 111 to, all finishes by usb 1 10; Host computer 111 programmed control the running parameter of acquisition system and duty and the last image data that receives; Usb 1 10 can be USB2.0 or other interfaces.The data message that host computer 111 collects is served the monitoring software system, the monitoring software system carries out the pulse data localization process, the continuous wave Recognition system, and invasion information shows warning function, database storing queries function, network communication and transmission function and subscriber management function.Early warning not only can accurately be located to vibration source position by this system, can also position early warning to a plurality of simultaneous oscillation points, and early warning information is stored in database in the future inquiry simultaneously, and assigns to the client computer that is attached thereto.
Broad domain all-optical fiber disturbance sensing and the positioning system of self-adaptation high dynamic range control circuit being mixed corresponding light path system and consisting of, the faint light reflected signal detects and the effect of the scope of collection and stability is remarkable to improving, by regulating corresponding potentiometer or digital gain control signal, can effectively regulate continuous wave signal intensity, continuous wave signal can be received and collect better.
Such as Fig. 1 ~ shown in Figure 5: in order to process continuous wave signal, semiconductor laser 101 signal transmitting terminals output to automatically controlled variable optical attenuator 102, after automatically controlled variable optical attenuator 102 carries out light intensity regulating, are connected to the optically-coupled end of circulator 103 again.A sensor fibre 104 in the important circumference underground laying of required protection is connected on the signal minute terminal of circulator 103; the reflection wave of returning from sensor fibre 104 formation sensor-based system tail ends is the carrier wave of transducing signal; described carrier wave is connected to photodetector 105 signal inputs through another signal minute terminal of circulator 103; be admitted to photodetector 105 and carry out opto-electronic conversion and prime amplification; obtain corresponding electric signal, signal outputs to fpga chip 109 and carries out buffer memory and transmission behind controllable gain amplifier 106.Fpga chip 109 compares analysis by power or the peak value to continuous wave signal, then fpga chip 109 is by D/A converter 108 output gain adjustment signals, and the output signal of D/A converter 108 is regulated the gain coefficient of 106 pairs of continuous waves of controllable gain amplifier.Controllable gain amplifier 106 by FPGA109 by D/A converter 108 control, with the number of stages of amplification of the continuous wave of regulating 104 reflections of 106 pairs of sensor fibres of controllable gain amplifier.After 109 pairs of continuous wave signals of fpga chip are estimated relatively, the gain coefficient of control controllable gain amplifier 106, improve the stability that controllable gain amplifier 106 carries out output continuous wave signal after the gain-adjusted, improve stability and reliability that fpga chip 109 receives signals.In the continuous wave signal input host computer 111 after fpga chip 109 will be processed by usb 1 10, after carrying out pattern-recognition by 111 pairs of continuous wave signals of host computer, store and the associative operation such as warning, reached the monitoring and early warning purpose of wide-field full-optical fiber supervisory system.
Claims (8)
1. a wide-field full-optical fiber sensor system continuous wave self-adaptation great dynamic range signal processing method is characterized in that described signal processing method comprises the steps:
(a), light emission module produces light signal, described light signal is coupled into sensor fibre (104), and sensor fibre (104) in the generation rear orientation light;
(b), receive the rear orientation light that sensor fibre (104) produces by photodetector (105), photodetector (105) is converted to corresponding continuous wave signal with the back scattering light signal that receives, and with described continuous wave signal input signal acquisition module;
(c), the controllable gain amplifier (106) in the signal acquisition module amplifies in the rear input signal processor the continuous wave signal denoising;
(d), signal processor compares threshold value default in the dynamic range of continuous wave signal and the signal processor, when the dynamic range of continuous wave signal and predetermined threshold value scope are complementary, signal processor carries out convergent-divergent to the dynamic range of continuous wave signal, and signal processor is to controllable gain amplifier (106) input gain conditioning signal, so that keep stable through the scope of continuous wave signal in controllable gain amplifier (106) input signal processor;
Described light emission module comprises semiconductor laser (101), the light path of described semiconductor laser (101) is provided with automatically controlled variable optical attenuator (102), and described automatically controlled variable optical attenuator (102) is coupled into light signal in the sensor fibre (104) by circulator (103);
The output terminal of described signal processor links to each other with the control end of automatically controlled variable optical attenuator (102), signal processor according to the dynamic range of continuous wave signal and setting threshold comparative result to automatically controlled variable optical attenuator (102) input attenuation conditioning signal, so that the light intensity of automatically controlled variable optical attenuator (102) output keeps stable.
2. wide-field full-optical fiber sensor system continuous wave self-adaptation great dynamic range signal processing method according to claim 1, it is characterized in that: in the described step (d), signal processor is to relatively comprising of continuous wave signal the amplitude of continuous wave signal or peak value and predetermined threshold value being compared, so that continuous wave signal is carried out convergent-divergent.
3. wide-field full-optical fiber sensor system continuous wave self-adaptation great dynamic range signal processing method according to claim 2, it is characterized in that: when signal processor carried out the amplitude comparison to continuous wave signal, signal processor calculated the root-mean-square value of some continuous wave signals; When the root-mean-square value that calculates is positioned at the threshold range of setting, the signal processor continuous wave signal of not amplifying or decay; When root-mean-square value during less than setting threshold, signal processor amplifies the continuous wave signal value; When root-mean-square value during greater than setting threshold, signal processor decay continuous wave signal.
4. wide-field full-optical fiber sensor system continuous wave self-adaptation great dynamic range signal processing method according to claim 2, it is characterized in that: when signal processor to continuous wave signal carry out peakedness ratio than the time, when the peak value of continuous wave signal is positioned at the setting threshold scope, the signal processor continuous wave signal of not amplifying or decay; When the peak value of continuous wave signal during less than setting threshold, signal processor amplifies continuous wave signal; When the peak value of monitor signal during greater than setting threshold, signal processor decay continuous wave signal.
5. described wide-field full-optical fiber sensor system continuous wave self-adaptation great dynamic range signal processing method one of according to claim 1 ~ 4, it is characterized in that: described signal processor comprises FPGA.
6. wide-field full-optical fiber sensor system continuous wave self-adaptation great dynamic range signal processing method according to claim 1, it is characterized in that: described signal processor links to each other with host computer (111) by USB transmission interface (110), described host computer (111) is to the monitoring electric signal pattern-recognition of signal processor input, can the invasion information that the monitoring electric signal comprises be shown early warning, the vibration source position of sensor fibre (104) is located early warning and data storing queries.
7. wide-field full-optical fiber sensor system continuous wave self-adaptation great dynamic range signal processing method according to claim 1, it is characterized in that: described controllable gain amplifier (106) links to each other with the input end of signal processor by A/D sampling card (107), and the output terminal of signal processor links to each other with the control end of controllable gain amplifier (106) by D/A converter (108).
8. wide-field full-optical fiber sensor system continuous wave self-adaptation great dynamic range signal processing method according to claim 1, it is characterized in that: described circulator (103) is the 3dB photo-coupler.
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