CN102393987A - 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 to be accompanied by the development of Fibre Optical Communication Technology the seventies in 20th century 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, is prone to can carry out the conversion of photoelectricity or electric light easily for various light-detecting devices receive, and is easy to be complementary with the Modern Electronic device and the computing machine of high development.The fiber work bandwidth, dynamic range is big, is suitable for remote networking and remote measuring and controlling on a large scale, is a kind of excellent low loss transmission 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 receives 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 at random distortion or the coarse scattering loss that produces of interface, the radiation loss that fibre-optical bending produces etc.; In these losses, the most important thing is the absorption loss of optical fiber.Because the influence of fibre loss, the variation range of continuous wave signal is generally very big, 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 fully distributed fiber sensor is to utilize an optical fiber as the sensing element that extends; Any one section on the optical fiber is sensing unit; Be 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 fully distributed fiber sensor mainly contains two big types: one type based on the backward scattered optical time domain reflection of optical fiber (OTDR) technology, another kind of interference technique based on long distance.The fully distributed fiber sensor utilizes an optical fiber to replace a large amount of discrete sensor, greatly reduces cost, and cost performance is very high, has obtained using widely.
The wide-field full-optical fiber sensor system is to utilize a kind of distributed sensing system of optical fiber as sensor information, can be to carrying out long-range and real-time safety monitoring along the invasion in the fibre circuit scope.Because the distributing optical fiber sensing technology can realize the extraction of distributed intelligence in the large-range measuring field, thereby it can use many field of measurement.Therefore, optical fiber sensing system is with a wide range of applications, and research and development have important economic value 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 deficiency that exists 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 the 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, said signal processing method comprises the steps:
A, light emission module produce light signal, and said light signal is coupled into sensor fibre, and in sensor fibre, produces rear orientation light;
B, receive the rear orientation light that sensor fibre produces through photodetector, photodetector is corresponding continuous wave signal with the rear orientation light conversion of signals that receives, and with said continuous wave signal input signal acquisition module;
Controllable gain amplifier in c, the signal acquisition module amplifies in the input signal processor of back the continuous wave signal denoising;
D, signal processor compare preset threshold value 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 makes through the scope maintenance of continuous wave signal in the controllable gain amplifier input signal processor stable to controllable gain amplifier input gain conditioning signal.
In the said 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 plurality of continuous ripple signal; When the root-mean-square value that calculates is positioned at the preset threshold scope, 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.
Said signal processor comprises FPGA.
Said light emission module comprises semiconductor laser, and the light path of said semiconductor laser is provided with automatically controlled variable optical attenuator, and said automatically controlled variable optical attenuator is coupled into light signal in the sensor fibre through circulator.
The output terminal of said 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, make the light intensity of automatically controlled variable optical attenuator output keep stablizing.
Said signal processor links to each other with host computer through the USB transmission interface; Said 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 location early warning and the data storage of sensor fibre are inquired about.
Said controllable gain amplifier links to each other with the input end of signal processor through A/D sampling card, and the output terminal of signal processor links to each other with the control end of controllable gain amplifier through D/A converter.
Said 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 constitute adaptation control circuit; After fpga chip compares judgement to continuous wave signal; Through the gain coefficient of adjustment controllable gain amplifier and the decay of automatically controlled variable optical attenuator; Effect to improving continuous wave signal detection and the scope of gathering, stability is remarkable; Can regulate continuous wave signal intensity effectively, make continuous wave signal received and to collect by FPGA better; Can be used in the monitoring and early warning safety-protection system, improve the reliability and the stability of safety-protection system.
Description of drawings
Fig. 1 is the structured flowchart of user mode of the present invention.
Fig. 2 is the waveform of continuous wave signal.
Fig. 3 is the self-adaptation HDR control block diagram that the present invention is based on FPGA.
The process flow diagram that Fig. 4 compares the continuous wave signal self-adaptation for signal processor of the present invention.
The another kind of process flow diagram that Fig. 5 compares the continuous wave signal self-adaptation for signal processor of the present invention.
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
Below in conjunction with concrete accompanying drawing and embodiment the present invention is described further.
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 microcosmic of inside of optical fibre refractive index inhomogeneous; Make the interior phase of light wave of propagating of sensor fibre change, transfer phase change to light intensity by interfere measurement technique 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 receives 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 KHzs, and the continuous wave signal waveform is as shown in Figure 2; Because the fluctuation range of continuous wave signal is bigger, therefore, need handle continuous wave signal in order to improve stability and the reliability that continuous wave signal is handled.
Because the fluctuation range of continuous wave signal is bigger, 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 ability 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 HDR can be under 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; Being unlikely to because input signal is too little can't operate as normal, also is unlikely to make signal processor take place saturated because input signal is too big or stop up.
As shown in Figure 1: for the present invention can carry out the big dynamic signal processing circuit of wide-field full-optical fiber sensor system continuous wave self-adaptation, said treatment circuit can be used in the monitoring and early warning safety-protection system.The big Dynamic Signal treating apparatus of said 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 through 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 gets into sensor fibre 104 backs and produces rear orientation light through sensor fibre 104 tail ends, and rear orientation light is coupled to photodetector 105 through circulator 103 again and carries out opto-electronic conversion, after prime is amplified, accomplishes the photodetection work of signal.The output terminal of photodetector 105 links to each other with controllable gain amplifier 106; Said controllable gain amplifier 106 links to each other with signal processor through A/D sampling card 107; The output terminal of signal processor links to each other with host computer 111 through USB transmission interface 110; Signal processor links to each other with the control end of controllable gain amplifier 106 through D/A converter 108; Be used to regulate the gain coefficient of controllable gain amplifier 106, the output terminal of signal processor and automatically controlled variable optical attenuator 102 are used to regulate 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 constitute light emission module; Sensor fibre 104 constitutes sensing light path module; Circulator 103 and photodetector 105 constitute Optical Receivers; Controllable gain amplifier 106, A/D sampling card 107, D/A converter 108 and fpga chip 109 constitute signal acquisition module (also being adaptation control circuit); Usb 1 10 constitutes signal transmission module, and host computer 111 constitutes 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 HDR is: when the signal voltage of photo-detector 105 inputs alters a great deal, keep controllable gain amplifier 106 output voltages constant or constant basically.Specifically, when input signal was very weak, the gain of controllable gain amplifier 106 was big, 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 receiving change in signal strength, the voltage of the output terminal of controllable gain amplifier 106 or power are constant basically or keep constant.Therefore the requirement to adaptation control circuit is: at input signal hour, adaptation control circuit is inoperative, has only after input signal increases to a certain degree, and adaptation control circuit is control usefulness, 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 said light signal is coupled into sensor fibre 104, and in sensor fibre 104, produce rear orientation light;
B, receive the rear orientation light that sensor fibres 104 produce through photodetector 105, photodetector 105 is corresponding continuous wave signal with the rear orientation light conversion of signals that receives, and with said continuous wave signal input signal acquisition module; Continuous wave signal is a digital signal level here;
106 pairs of continuous wave signal denoisings of controllable gain amplifier in c, the signal acquisition module are amplified in the back input fpga chip 109;
D, fpga chip 109 compare the dynamic range and the fpga chip 109 interior preset threshold value 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; Make the scope of process controllable gain amplifier 106 input fpga chips 109 interior continuous wave signals keep stable, so that the scope that fpga chip 109 devices are imported continuous wave signal to host computer keeps stablizing.
For realizing above-mentioned treatment step, an ability 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 control loop of self-adaptation HDR is made up of controllable gain amplifier 106, A/D sampling card 107, fpga chip 109 and D/A converter 108.To realize the self-adaptation HDR through fpga chip 109 controls, must detect the estimated value of continuous wave signal amplitude or power earlier.
In the said 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; Comparison determination methods flow process such as Fig. 4 and shown in Figure 5 that fpga chip 109 is concrete.
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 plurality of continuous ripple signals; When the root-mean-square value that calculates is positioned at the preset threshold scope, fpga chip 109 continuous wave signal of not amplifying or decay; In limited time following less than setting threshold when root-mean-square value, 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 make the gain coefficient of controllable gain amplifier 106 keep stable through the gain-adjusted signal, improve the stability of controllable gain amplifier 106 to fpga chip 109 input continuous wave signals.
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 is gathered the peak value of several continuous wave signals, and takes out maximal value in the said peak value as the foundation of relatively judging; 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 make the gain coefficient of controllable gain amplifier 106 keep stable through the gain-adjusted signal, improve the stability of controllable gain amplifier 106 to fpga chip 109 input continuous wave signals.
Because feedback fraction fpga chip 109 feeds back to the control end of controllable gain amplifier 106 among the present invention through D/A converter 108; Whole process is realized by numerical approach; Make complicated control requirement easier to realize, so have advantages such as quick convergence and accurate steady-state response.Judge in the fpga chip 109 that predetermined threshold value can be provided with 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 selects to adopt root-mean-square value comparison or peakedness ratio than determination methods; So that the gain coefficient of controllable gain amplifier 106 is regulated, so that the continuous wave signal in the follow-up entering fpga chip 109 keeps stable.
Automatically controlled variable optical attenuator 102 (EVOA) is one of the most basic passive device, and is 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 automatic setting up procedure 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; With in the fpga chip 109 target value set compare; Come to accomplish the automatic decay of automatically controlled variable optical attenuator 102 and regulate according to result relatively to automatically controlled variable optical attenuator 102 output control signals.Target value set is relevant with the voltage of controllable gain amplifier 106 inputs in the fpga chip 109, confirms the attenuation amplitude of automatically controlled variable optical attenuator 102 according to the comparative result of input voltage.
As shown in Figure 3: as to be the signal processing control circuit principle of self-adaptation HDR 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, convert control signal into analog quantity through D/A converter 108, insert the control end of controllable gain amplifier 106, realize 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:
Being used for safety-protection system with sensor fibre 104 is example, and 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.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 control to continuous wave through D/A converter 108 control controllable gain amplifiers 106, and continuous wave is received by fpga chip 109 better.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 information and data fed back 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 accomplishes through usb 1 10; Host computer 111 programmed control running parameter and duty and the last image data that receives of acquisition system; 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 identification of continuous wave data pattern, and invasion information shows warning function; The database storing query 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 and supplies inquiry in the future simultaneously, and assigns to the client computer that is attached thereto.
Self-adaptation HDR control circuit is mixed corresponding light path system and the broad domain all-optical fiber disturbance sensing and the positioning system that constitute; The faint light reflected signal detects and the scope of collection is remarkable with the effect of stability to improving; Through regulating corresponding potentiometer or digital gain control signal; Can regulate continuous wave signal intensity effectively, continuous wave signal can be received and collect better.
Like Fig. 1 ~ shown in Figure 5: in order to handle 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 branch 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; Said carrier wave is connected to photodetector 105 signal inputs through another signal branch 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 through power or the peak value to continuous wave signal; Fpga chip 109 is through D/A converter 108 output gain adjustment signals, the gain coefficient of 106 pairs of continuous waves of output Signal Regulation controllable gain amplifier of D/A converter 108 then.Controllable gain amplifier 106 by FPGA109 through 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 handled through usb 1 10; After carrying out pattern-recognition through 111 pairs of continuous wave signals of host computer; Store and associative operation such as warning, reached the monitoring and early warning purpose of wide-field full-optical fiber supervisory system.
Claims (10)
1. a wide-field full-optical fiber sensor system continuous wave self-adaptation great dynamic range signal processing method is characterized in that said signal processing method comprises the steps:
(a), light emission module produces light signal, said 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 through photodetector (105); Photodetector (105) is corresponding continuous wave signal with the rear orientation light conversion of signals that receives, and with said continuous wave signal input signal acquisition module;
(c), the controllable gain amplifier (106) in the signal acquisition module amplifies in the input signal processor of back the continuous wave signal denoising;
(d), signal processor compares preset threshold value 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 makes through the scope maintenance of continuous wave signal in controllable gain amplifier (106) input signal processor stable to controllable gain amplifier (106) input gain conditioning signal.
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 said 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 plurality of continuous ripple signal; When the root-mean-square value that calculates is positioned at the preset threshold scope, 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. according to the described wide-field full-optical fiber sensor system of one of claim 1 ~ 4 continuous wave self-adaptation great dynamic range signal processing method, it is characterized in that: said 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: said light emission module comprises semiconductor laser (101); The light path of said semiconductor laser (101) is provided with automatically controlled variable optical attenuator (102), and said automatically controlled variable optical attenuator (102) is coupled into light signal in the sensor fibre (104) through circulator (103).
7. wide-field full-optical fiber sensor system continuous wave self-adaptation great dynamic range signal processing method according to claim 6; It is characterized in that: the output terminal of said signal processor links to each other with the control end of automatically controlled variable optical attenuator (102); Signal processor according to continuous wave signal dynamically with the setting threshold comparative result to automatically controlled variable optical attenuator (102) input attenuation conditioning signal, make the light intensity of automatically controlled variable optical attenuator (102) output keep stablizing.
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: said signal processor links to each other with host computer (111) through USB transmission interface (110); Said 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 location early warning and the data storage of sensor fibre (104) are inquired about.
9. 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: said controllable gain amplifier (106) links to each other with the input end of signal processor through 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) through D/A converter (108).
10. wide-field full-optical fiber sensor system continuous wave self-adaptation great dynamic range signal processing method according to claim 6, it is characterized in that: said circulator (103) is the 3dB photo-coupler.
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| CN107211182A (en) * | 2015-05-26 | 2017-09-26 | 松下电器（美国）知识产权公司 | Display methods and display device |
| CN108693079A (en) * | 2018-04-16 | 2018-10-23 | 东南大学 | Particle flow parameter measuring apparatus and method based on laser backscatter method |
| CN112996437A (en) * | 2018-11-20 | 2021-06-18 | 深圳市大耳马科技有限公司 | Self-adaptive adjustment and regulation method, device and system for optical fiber sensor |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1862239A (en) * | 2006-06-15 | 2006-11-15 | 华中科技大学 | Distributed optical fiber vibration sensing method and apparatus thereof |
| CN101299635A (en) * | 2008-05-09 | 2008-11-05 | 东南大学 | Apparatus and method for discriminating front and back of wide field complete-optical fiber disturbing signal |
| JP2010237083A (en) * | 2009-03-31 | 2010-10-21 | Hitachi Cable Ltd | Intruder detection device and intruder detection method |
| JP2011174848A (en) * | 2010-02-25 | 2011-09-08 | Panasonic Electric Works Co Ltd | Device for detection of fence vibration, and method of adjusting threshold |
-
2011
- 2011-09-23 CN CN 201110286454 patent/CN102393987B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1862239A (en) * | 2006-06-15 | 2006-11-15 | 华中科技大学 | Distributed optical fiber vibration sensing method and apparatus thereof |
| CN101299635A (en) * | 2008-05-09 | 2008-11-05 | 东南大学 | Apparatus and method for discriminating front and back of wide field complete-optical fiber disturbing signal |
| JP2010237083A (en) * | 2009-03-31 | 2010-10-21 | Hitachi Cable Ltd | Intruder detection device and intruder detection method |
| JP2011174848A (en) * | 2010-02-25 | 2011-09-08 | Panasonic Electric Works Co Ltd | Device for detection of fence vibration, and method of adjusting threshold |
Non-Patent Citations (2)
| Title |
|---|
| 杨明等: "基于FPGA的EVOA衰减自动控制系统设计", 《计量技术》 * |
| 魏海潮等: "基于FPGA具有自适应功能的数据采集系统设计", 《电子测试》 * |
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| CN103968933B (en) * | 2014-04-09 | 2016-08-17 | 西安电子科技大学 | Fiber-optic vibration signal recognition method based on fuzzy field feature |
| CN103968933A (en) * | 2014-04-09 | 2014-08-06 | 西安电子科技大学 | Fuzzy domain characteristics based optical fiber vibration signal identifying method |
| CN104568121A (en) * | 2015-01-14 | 2015-04-29 | 东南大学 | Method and device for comprehensively controlling parameters of high-adaptability optical fiber vibration sensing system |
| CN104596558A (en) * | 2015-01-16 | 2015-05-06 | 东南大学 | Self-adaptation gain equalization type distributed optical fiber sensing optical signal receiving method and device |
| CN104596558B (en) * | 2015-01-16 | 2017-03-08 | 东南大学 | Adaptive gain balanced type distributing optical fiber sensing optical signal method of reseptance and device |
| CN105092087A (en) * | 2015-03-20 | 2015-11-25 | 深圳市迅捷光通科技有限公司 | Photoelectric conversion module, temperature compensation method for photoelectric conversion module, and distributed light sensing system |
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| CN107211182B (en) * | 2015-05-26 | 2020-04-28 | 松下电器（美国）知识产权公司 | Display method and display device |
| CN105357749A (en) * | 2015-10-16 | 2016-02-24 | 北京航天万达高科技有限公司 | Novel automatic gain control method for digital communication |
| CN105357749B (en) * | 2015-10-16 | 2018-08-31 | 北京航天万达高科技有限公司 | A kind of new type auto gain control method for digital communication |
| CN106772437A (en) * | 2016-12-12 | 2017-05-31 | 中国科学院合肥物质科学研究院 | The laser radar apparatus of Self Adaptive Control dynamic range |
| CN106772437B (en) * | 2016-12-12 | 2020-11-27 | 中国科学院合肥物质科学研究院 | Laser radar device capable of adaptively controlling dynamic range |
| CN108693079A (en) * | 2018-04-16 | 2018-10-23 | 东南大学 | Particle flow parameter measuring apparatus and method based on laser backscatter method |
| CN112996437A (en) * | 2018-11-20 | 2021-06-18 | 深圳市大耳马科技有限公司 | Self-adaptive adjustment and regulation method, device and system for optical fiber sensor |
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