CN107478352A - Based on Brillouin scattering and merge the distribution type sensing method and system of chaos optical signal - Google Patents
Based on Brillouin scattering and merge the distribution type sensing method and system of chaos optical signal Download PDFInfo
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Abstract
It is a kind of based on Brillouin scattering and to merge the distributed sensing system of chaos optical signal, including laser module (1), first annular device (2), first coupler (3), photoswitch (4), chaotic laser light signal generation control module (5), first optoisolator (6), second coupler (7), first Polarization Controller (8), first electrooptic modulator (9), first image intensifer (10), second Polarization Controller (11), second electrooptic modulator (12), electric signal modulation module (13), bias control module (14), tunable optical delay line, second image intensifer, scrambler (17), second optoisolator, testing fiber, second circulator, adjustable light wave-filter, photoelectric detection module, data acquisition and procession module；The distributed optical time-domain analysis sensing of Brillouin scattering and Brillouin's correlation analysis sensor-based system of fusion chaos optical signal are realized, obtains quick and high-precision target positioning.
Description
Technical field
The present invention relates to technical field of optical fiber sensing, is related to a kind of distributing optical fiber sensing method and system, more particularly to
It is a kind of based on Brillouin scattering and to merge the distributed strain of chaos optical signal, TEMP monitoring method and system.
Background technology
Research shows that strain or temperature have linear relationship with Brillouin shift, and 1989, Horiguchi et al. was carried accordingly
Brillouin Optical Time-Domain Analysis, BOTDA based on stimulated Brillouin scattering enlarge-effect are gone out)
Sensing technology, also referred to as brillouin gain type BOTDA.In brillouin gain type BOTDA sensing technologies, the both ends of optical fiber are penetrated respectively
Enter as pumping pulsed light and as detection continuous light, about Brillouin shift of frequency phase-difference of two-way light, due to by
Swash Brillouin scattering effect, energy transfer is given detection continuous light by the pulsed light of pumping, by changing the difference on the frequency of two-way light simultaneously
The size of energy transfer between them is detected to determine Brillouin shift amount, and then realizes the monitoring to temperature and strain.
Correlation analysis sensing (CHAOS-BOCDA) technology of stimulated Brillouin scattering based on chaos signal source, using mixed
Ignorant signal realizes corresponding points as the pump light and detection light, relevant peaks when being transmitted in opposite directions in a fiber using two-way light of system
The measurement of Brillouin shift amount, determined by the BOCDA sensor-based system operation principles based on chaotic signal, its sensing resolution
Determined by the coherence length of chaos optical signal, system can obtain higher spatial resolution.
Both the above technology is all to realize the measurement of temperature and strain by measuring the Brillouin shift amount in optical fiber, main
It is that BOTDA technologies need not adjust delay line to want difference, can directly obtain frequency displacement point position, be disadvantageous in that spatial resolution
Limited by pumping pulse width；CHAOS-BOCDA technologies are to obtain high spatial point by the coherence length of chaos optical signal
Resolution, high resolution reach cm magnitudes, but the brillouin gain time spectrum of the system all points along measurement optical fiber, need to be by changing point by point
The length of varying delay-line obtains, and when distance sensing is longer, the measure of this change delay line length reduces the survey of system
Try efficiency, it is difficult to meet practical engineering application needs.
The content of the invention
In view of the shortcomings of the prior art, the present invention seeks to propose one kind based on Brillouin scattering and merge chaos light letter
Number distribution type sensing method, a kind of fusion Brillouin optical time domain analysis instrument (BOTDA) and Brillouin are proposed based on this method
The compound distributed temperature of correlation analysis instrument (CHAOS-BOCDA), strain monitoring system.
The described of the present invention based on Brillouin scattering and merges the distribution type sensing method of chaos optical signal and system refers to
Set of system can realize two kinds of measurement schemes, and one kind is Brillouin optical time domain analysis instrument (hereinafter referred to as BOTDA), and another kind is base
In Brillouin's correlation analysis instrument (hereinafter referred to as CHAOS-BOCDA) of chaotic signal.
The purpose of the present invention is achieved through the following technical solutions：One kind is based on Brillouin scattering and merges chaos light letter
Number distributed sensing system, including laser module 1, first annular device 2, the first coupler 3, photoswitch 4, chaotic laser light letter
Number generation control module 5, the first optoisolator 6, the second coupler 7, the first Polarization Controller 8, the first electrooptic modulator 9, the
One image intensifer 10, the second Polarization Controller 11, the second electrooptic modulator 12, electric signal modulation module 13, bias control module
14th, tunable optical delay line 15, the second image intensifer 16, scrambler 17, the second optoisolator 18, testing fiber 19, the second ring
Shape device 20, adjustable light wave-filter 21, photoelectric detection module 22, data acquisition and procession module 23；Laser module 1, which connects, to be included
The b ports of the first annular device 2 of 3 ports (a, b, c), the c ports of first annular device 2 connect comprising 1 input port, 2 it is defeated
The input port of first coupler 3 of exit port, the first output port of the first coupler 3 connect the input port of photoswitch 4, light
The output port of switch 4 connects chaotic laser light signal generation control module 5, and chaotic laser light signal generation control module 5 connects the first ring
The a mouths of shape device 2；Second output port of the first coupler 3 connects the input of the first optoisolator 6 and the second coupler 7 successively
Mouthful, the first output port of the second coupler 7 connects the first Polarization Controller 8, the light input end of the first electrooptic modulator 9 successively
Mouthful, the optical output port of the first electrooptic modulator 9 connects the input port of the first image intensifer 10, the output end of the first image intensifer 10
Mouth connects a ports of the second circulator 20；Second output port of the second coupler 7 connects the input port of the second Polarization Controller 11,
The output port of second Polarization Controller 11 connects the light input end mouth of the second electrooptic modulator 12, and the light of the second electrooptic modulator 12 is defeated
Exit port connects tunable optical delay line 15, and the output port of tunable optical delay line 15 connects the second image intensifer 16, scrambler successively
17th, the second optoisolator 18 and testing fiber 19, the b ports of the second circulator 20 of another termination of testing fiber 19；First electric light
Modulator 9, the electrical modulation input port of the second electrooptic modulator 12 and bias voltage control port connect electric signal modulation module 13 respectively
With bias control module 14；The c ports of second circulator 20 connect adjustable light wave-filter 21, photoelectric detection module 22, number successively
According to collection and processing module 23.
It is described based on Brillouin scattering and to merge the distributed sensing system of chaos optical signal, the energy of the sensor-based system
Enough testing fiber is monitored using two kinds of sensor-based systems, the first sensor-based system is the distributed light based on Brillouin scattering
Time-domain analysis method for sensing (BOTDA), second of sensor-based system pass for the brillouin distributed smooth correlation analysis based on chaos light
Sensing method (CHAOS-BOCDA).
The first method for sensing (BOTDA) connects control mode：Disconnect photoswitch 4, the continuous light letter of laser transmitting
Number, electric signal modulation module 13 and bias control module 14 control the first electrooptic modulator 9, export the first electrooptic modulator 9
Pumping light pulse；What now the monitoring method of whole system, data analysing method utilized is Brillouin's time-domain analysis method for sensing；
Second of method for sensing (CHAOS-BOCDA) connects control mode：Close photoswitch 4, the company of laser transmitting
Continuous optical signal is connected in chaotic laser light signal generation control module 5, and electric signal modulation module 13 and bias control module 14 control
First electrooptic modulator 9 is in minimum extinction ratio state, and this optical signal is by the first electrooptic modulator 9 equivalent to by one section
Optical fiber, make the stable continuous optical signal of the first electrooptic modulator 9 output；Now whole system monitoring method, data analysing method
What is utilized is Brillouin's correlation analysis method for sensing based on chaos light.
When the system is operated under BOTDA patterns, its course of work is that monitoring step is：
1) the continuous optical signal that the laser module 1 exports enters the first coupler 3, the first coupling through first annular device 2
Optical signal is divided into two-way by clutch 3, and the road 3-2 output signals of the first coupler 3 second enter the second coupling through the first optoisolator 6
Device 7；The first via 3-1 of first coupler 3 outputs are disconnected by photoswitch 4, do not access subsequent optical path；Second coupler 7, which will input, to be believed
Number it is divided into two-way：Wherein first via 7-1 signals are modulated into pump light after the first Polarization Controller 8 by the first electrooptic modulator 9
Pulse, after pumping light pulse is amplified by the first image intensifer 10, enter testing fiber 19 through the second circulator 20 and form pumping road
Signal；Another way optical signal is connected to the second Polarization Controller 11, after by after the shift frequency of the second electrooptic modulator 12 formed detection light letter
Number, detection optical signal enters testing fiber through optical delay line 15, the second image intensifer 16, scrambler 17, the second optoisolator 18
19；
2) the electric signal modulation module 13 and bias control module 14 control the first electrooptic modulator 9, make its rear pump
Pu light pulse, control the second electrooptic modulator 12, by corresponding to detectable signal centre frequency shift frequency to laser center wavelength this
Near lentor light frequency；
3) transducing signal in the testing fiber 19 enters adjustable light wave-filter 21 through the output of the second circulator 20, can
The Brillouin spectrum that tuned light wave filter 21 exports delivers to data acquisition and procession module 23 after the conversion of photoelectric detection module 22；
4) the Data Analysis Services module 23 by being amplified to data, after noise reduction, the basic handling such as filtering to being
The Monitoring Data of system carries out curve fitting, feature recognition, center frequency points extraction etc. analyzing and processing, calculate corresponding temperature,
Strain variation amount, and provide monitoring result.
When the system is operated under CHAOS-BOCDA patterns, its course of work is that monitoring step is：
1) b, c port of the continuous optical signal through first annular device 2 that the laser module 1 exports enters the first coupler
3；Optical signal is divided into two-way by the first coupler 3, wherein the first via 3-1 of the first coupler 3 output optical signal through photoswitch 4,
Chaotic laser light signal generation control module 5, a ports of first annular device 2 feed back to laser module 1, and this loop is used to be formed
Stable chaos optical signal；The optical signal of the road 3-2 of first coupler 3 second outputs enters the second coupling through the first optoisolator 6
Input signal is divided into two-way by device 7, the second coupler 7：The first via 7-1 signals of wherein the second coupler 7 are through the first Polarization Control
The stable chaos optical signal of device 8, the output of the first electrooptic modulator 9, herein electrooptic modulator do not modulate pulse, chaotic signal is by the
After the amplification of one image intensifer 10, enter testing fiber 19 through the second circulator 20 and form chaos pump signal；Second coupler 7
The stable chaos detectable signal of two road 7-2 outputs is formed after the second Polarization Controller 11 after the shift frequency of second electrooptic modulator 12
Optical signal is detected, detection optical signal enters through optical delay line 15, the second image intensifer 16, scrambler 17, the second optoisolator 18
Testing fiber 19；
2) the electric signal modulation module 13 and bias control module 14 control the first electrooptic modulator 9, make the first electric light
Modulator 9) extinction ratio minimizes and exports stable chaos pump signal, controls the second electrooptic modulator 12, and will detection letter
Number corresponding to centre frequency shift frequency to laser center wavelength near Stokes light frequency；
3) the chaos transducing signal in the testing fiber 19 enters tunable optical through the output of the second circulator 20c ports and filtered
Ripple device 21, the Brillouin spectrum that adjustable light wave-filter 21 exports deliver to data acquisition and procession after the conversion of photoelectric detection module 22
Module 23；
4) after electric signal is carried out analog-to-digital conversion and storage by the data acquisition and procession module 23, data are put
Greatly, the Monitoring Data of system is carried out curve fitting after the basic handling such as noise reduction, filtering, feature recognition, center frequency points are extracted
Deng analyzing and processing, corresponding temperature, strain variation amount are calculated, provides monitoring result.
Most devices in two kinds of method for sensing sharing systems, data processing unit from different data processings and
Analysis method, and monitoring result will be provided, realize temperature along optical fiber, strain monitoring.
Technical scheme provided by the invention can be seen that it is of the present invention based on Brillouin scattering and merge chaos light letter
Number distribution type sensing method and system, disclose it is a kind of merge chaos optical signal compound Distributed Optical Fiber Sensing Techniques,
System can realize two kinds of light path connection schemes by the control to a photoswitch and an electrooptic modulator, then form two
Testing scheme is covered, can first select BOTDA technologies quickly to scan testing fiber in monitoring process.Determine frequency displacement point substantially
High resolution scanning is carried out from CHAOS-BOCDA technologies again behind position, obtains accurate positioning.
The beneficial effects of the present invention are propose a kind of high sensitivity distribution type sensing method.In traditional Brillouin light
Chaos light Brillouin light correlation analysis instrument has been merged on the basis of domain analysis instrument.BOTDA measuring speeds are higher, CHAOS-BOCDA
The high characteristic of spatial resolution, two kinds of systems are blended and learnt from other's strong points to offset one's weaknesses.Will based on the control to photoswitch and electrooptic modulator
Two kinds of optical fiber sensing systems are merged, and both BOTDA fast speeds can be used to estimate the approximate location of temperature spot or strain point,
Obtain high monitoring speed；Recycling CHAOS-BOCDA high spatial resolution (cm magnitudes) determines the specific position residing for strain point
Put.Two kinds of technologies are used in combination so that sensor-based system precision, monitoring velocity, spatial resolution can obtain effective improvement.With
Simple BOTDA or CHAOS-BOCDA is compared, and the present invention is integrated two sets of sensor-based systems, has been reused in system
Most devices, improve monitoring capability, monitoring efficiency and the cost for having saved system of system.The technology can be to bridge
Distributed monitoring is realized in the temperature of beam tunnel, oil-gas pipeline, communications optical cable, building etc. or strain.
Two sets of measurement schemes of one aspect of the present invention have reused most measurement apparatus in system, improve sensing
The utilization ratio of device, two kinds of measurement schemes of other direction are successively monitored to goal systems, can optimize the detection spirit of system
The parameter indexs such as sensitivity, monitoring speed, positioning precision, and then improve the engineering application value of monitoring system.
Brief description of the drawings
Fig. 1 be in the present invention based on Brillouin scattering and merge the structural frames of the distributed sensing system of chaos optical signal
Figure.(a of first, second circulator 20,3 points of b, c are the port of the 1st, the 2nd and the 3rd of circulator respectively, optical signal energy and can only
It is transmitted in a manner of from a to b or from b to c；3-1 and 3-2 is the output port of the first coupler 3 first and second；7-1
It is the output port of the second coupler 7 first and second with 7-2.)
Embodiment
The preferred embodiment that the invention will now be described in detail with reference to the accompanying drawings.
The system architecture of the present invention includes laser module 1, first annular device 2, the first coupler 3, photoswitch 4, chaos
Laser signal generation control module 5, the first optoisolator 6, the second coupler 7, the first Polarization Controller 8, the first Electro-optical Modulation
Device 9, the first image intensifer 10, the second Polarization Controller 11, the second electrooptic modulator 12, electric signal modulation module 13, bias control
Molding block 14, tunable optical delay line 15, the second image intensifer 16, scrambler 17, the second optoisolator 18, testing fiber 19,
Second circulator 20, adjustable light wave-filter 21, photoelectric detection module 22, data acquisition and procession module 23.
Each light of the present invention, electric module connection control mode are as follows：
Laser module 1 connects the b ports of the first annular device 2 comprising 3 ports (a, b, c), the c ends of first annular device 2
Mouth connects the input port of the first coupler 3 comprising 1 input port, 2 output ports, the 1st output end of the first coupler 3
Mouth 3-1 connects the input port of photoswitch 4, and the output port of photoswitch 4 connects chaotic laser light signal generation control module 5, and chaos swashs
Optical signal generation control module 5 connects a mouths of first annular device 2；It is optically isolated that 2nd output port 3-2 of the first coupler 3 connects first
Device 6, the first optoisolator 6 connect the input port of the second coupler 7, and it is inclined that the 1st output port 7-1 of the second coupler 7 connects first
Shake controller 8, and the first Polarization Controller 8 connects the light input end mouth of the first electrooptic modulator 9, and the light of the first electrooptic modulator 9 is defeated
Exit port connects the first image intensifer 10, and the first image intensifer 10 connects a ports of the second circulator 20；The 2nd of second coupler 7 is defeated
Exit port 7-2 connects the input port of the second Polarization Controller 11, and the output port of the second Polarization Controller 11 connects the second electrooptic modulator
12 light input end mouth, the optical output port of the second electrooptic modulator 12 connect tunable optical delay line 15, tunable optical delay
The output port of line 15 connects the second image intensifer 16, and the output port of the second image intensifer 16 connects scrambler 17, the output end of scrambler 17
Mouth connects the second optoisolator 18, and the output port of the second optoisolator 18 connects testing fiber 19, another termination second of testing fiber 19
The b ports of circulator 20；First electrooptic modulator 9, the electrical modulation input port of the second electrooptic modulator 12 and bias voltage control end
Mouth connects electric signal modulation module 13 and bias control module 14 respectively；The c ports of second circulator 20 connect adjustable light wave-filter
21, adjustable light wave-filter 21 connects the input of photoelectric detection module 22；The output port of photoelectric detection module 22 connects data and adopted
Collection and processing module 23.
The present invention successively uses two methods of BOTDA and CHAOS-BOCDA in monitoring process.Two kinds of the sensor-based system
Method for sensing is as follows：
The first method for sensing " the distributed optical time-domain analysis method for sensing (BOTDA) based on Brillouin scattering ", it is corresponding
The first line connection control mode and monitoring step it is as follows：
1) b, c port of the continuous optical signal through first annular device 2 that the laser module 1 exports enters the first coupler
3, optical signal is divided into two-way by the first coupler 3, and the second road 3-2 outputs of the first coupler 3 enter the through the first optoisolator 6
(first via 3-1 outputs of the first coupler 3 are disconnected two couplers 7 by photoswitch 4, do not access light path.), the second coupler 7 will
Input signal is divided into two-way：The first via 7-1 of wherein the second coupler 7 is after the first Polarization Controller 8 by the first electrooptic modulator 9
Pumping light pulse is modulated into, after light pulse is amplified by the first image intensifer 10, enters the shape of testing fiber 19 through the second circulator 20
Into pumping road signal；The road 7-2 optical signals of second coupler 7 second are connected to the second Polarization Controller 11, after by the second Electro-optical Modulation
Detection optical signal is formed after the shift frequency of device 12, detection optical signal is through optical delay line 15, the second image intensifer 16, scrambler 17, second
Optoisolator 18 enters testing fiber 19；
2) the electric signal modulation module 13 and bias control module 14 control the first electrooptic modulator 9, make its rear pump
Pu light pulse；Control the second electrooptic modulator 12, by corresponding to detectable signal centre frequency shift frequency to laser center wavelength this
Near lentor light frequency；
3) transducing signal in the testing fiber 19 enters adjustable light wave-filter 21 through the output of the second circulator 20, can
The Brillouin spectrum that tuned light wave filter 21 filters out delivers to data acquisition and procession module 23 after the conversion of photoelectric detection module 22；
4) after electric signal is carried out analog-to-digital conversion and storage by data acquisition and procession module 23, data is amplified, dropped
Make an uproar, filter etc. after basic handling, the Monitoring Data of system being carried out curve fitting, feature recognition, center frequency points extract decile
Analysis is handled, and is calculated corresponding temperature, strain variation amount, is finally provided monitoring result.
Second of method for sensing " brillouin distributed smooth correlation analysis method for sensing (CHAOS- based on chaos light
BOCDA) ", corresponding second of line connection control mode and monitoring step are as follows：
1) b, c port of the continuous optical signal through first annular device 2 that the laser module 1 exports enters the first coupler
3, optical signal is divided into two-way by the first coupler 3, wherein the first via 3-1 of the first coupler 3 output optical signal through photoswitch 4,
A port of the chaotic laser light signal generation control module 5 again through first annular device 2 feeds back to laser module 1, and this loop is used for
Form stable chaos optical signal；The road 3-2 of first coupler 3 second exports optical signal and enters the second coupling through the first optoisolator 6
Input signal is divided into two-way by clutch 7, the second coupler 7：Wherein the first via 7-1 signals of the second coupler 7 are through the first polarization
The stable chaos optical signal (electrooptic modulator does not modulate pulse herein) of controller 8, the output of the first electrooptic modulator 9, chaos letter
After number being amplified by the first image intensifer 10, enter testing fiber 19 through the second circulator 20 and form pumping road signal；Second coupling
The chaotic signal of the second road 7-2 output stabilizations of device 7 is after the second Polarization Controller 11 by after the shift frequency of the second electrooptic modulator 12
Detection optical signal is formed, detection optical signal is through optical delay line 15, the second image intensifer 16, scrambler 17, the second optoisolator 18
Into testing fiber 19；
2) the electric signal modulation module 13 and bias control module 14 control the first electrooptic modulator 9, make its extinction ratio
Minimize and export stable chaotic signal；Control the second electrooptic modulator 12, by detectable signal centre frequency shift frequency to swash
Corresponding to light device centre wavelength near Stokes light frequency；
3) c port output of the transducing signal in the testing fiber 19 through the second circulator 20 enters tunable optical and filtered
Device 21, the Brillouin spectrum that adjustable light wave-filter 21 exports deliver to data acquisition and procession mould after the conversion of photoelectric detection module 22
Block 23；
4) after electric signal is carried out analog-to-digital conversion and storage by data acquisition and procession module 23, data is amplified, dropped
Make an uproar, filter etc. after basic handling, the Monitoring Data of system being carried out curve fitting, feature recognition, center frequency points extract decile
Analysis is handled, and is calculated corresponding temperature, strain variation amount, is finally provided monitoring result.
Above example is only the better embodiment of the present invention, but protection scope of the present invention is not limited thereto, no
Depart from any modification of spirit and scope of the invention and local replacement, should all be included within the scope of the present invention.
Claims (4)
- Based on Brillouin scattering and the distributed sensing system of chaos optical signal is merged 1. a kind of, it is characterized in that including laser die Block (1), first annular device (2), the first coupler (3), photoswitch (4), chaotic laser light signal generation control module (5), first Optoisolator (6), the second coupler (7), the first Polarization Controller (8), the first electrooptic modulator (9), the first image intensifer (10), the second Polarization Controller (11), the second electrooptic modulator (12), electric signal modulation module (13), bias control module (14), tunable optical delay line (15), the second image intensifer (16), scrambler (17), the second optoisolator (18), testing fiber (19), the second circulator (20), adjustable light wave-filter (21), photoelectric detection module (22), data acquisition and procession module (23)；Wherein, laser module is connect comprising a, b, the b ports of the first annular device of tri- ports of c, the c ends of first annular device (2) Mouth connects the input port of the first coupler (3) comprising 1 input port, 2 output ports, and the first of the first coupler (3) Output port connects the input port of photoswitch (4), and the output port of photoswitch (4) connects chaotic laser light signal generation control module 5, Chaotic laser light signal generation control module (5) connects a mouths of first annular device (2)；Second output port of the first coupler (3) according to The secondary input port for connecing the first optoisolator (6) and the second coupler 7, the first output port of the second coupler (7) connect successively The light input end mouth of first Polarization Controller (8), the first electrooptic modulator (9), the optical output port of the first electrooptic modulator connect First image intensifer (10) input port, the output port of the first image intensifer connect a ports of the second circulator (20)；Second coupling Second output port of clutch (7) connects the second Polarization Controller (11) input port, and the second Polarization Controller output port connects The light input end mouth of two electrooptic modulators (12), the optical output port of the second electrooptic modulator connect tunable optical delay line 15, can Tuning optical delay line (15) output port connect successively the second image intensifer (16), scrambler (17), the second optoisolator (18) and Testing fiber (19), the b ports of testing fiber (19) the second circulator of another termination (20)；First electrooptic modulator (9), second The electrical modulation input port of electrooptic modulator (12) and bias voltage control port connect electric signal modulation module (13) and bias control respectively Molding block (14)；The c ports of second circulator (20) connect adjustable light wave-filter (21), photoelectric detection module (22), number successively According to collection and processing module (23).
- Based on Brillouin scattering and the distributed sensing system of chaos optical signal is merged 2. according to claim 1, and it is special Sign is being monitored using two kinds of sensor-based systems to testing fiber for the sensor-based system, and the first sensor-based system is base In the distributed optical time-domain analysis method for sensing (BOTDA) of Brillouin scattering, second of sensor-based system is the cloth based on chaos light In the distributed light correlation analysis method for sensing (CHAOS-BOCDA) in deep pool；Described two method for sensing pass through two kinds of connection controls Method processed is realized, i.e., is realized in the break-make of photoswitch and the control program of the first electrooptic modulator, specifically connect control mode It is as follows：1) the first (BOTDA) sensor-based system connection control mode is：Disconnect photoswitch (4), the continuous light letter of laser transmitting Number, electric signal modulation module (13) and bias control module (14) control the first electrooptic modulator (9), make the first electrooptic modulator Export pumping light pulse；The first electrooptic modulator is set to export pumping light pulse；The now monitoring method of whole system, data analysis What method utilized is Brillouin's time-domain analysis method for sensing；2) second (CHAOS-BOCDA) sensor-based system connects control mode：The continuous optical signal of laser transmitting is closed Photoswitch (4) is connected in chaotic laser light signal generation control module (5)；Electric signal modulation module (13) and bias control module (14) the first electrooptic modulator of control is in minimum extinction ratio state, and this optical signal is by the first electrooptic modulator equivalent to warp One section of optical fiber is crossed, makes the stable continuous optical signal of the first electrooptic modulator output；Now whole system monitoring method, data analysis What method utilized is Brillouin's correlation analysis method for sensing based on chaos light.
- 3. according to claim 1,2 based on Brillouin scattering and merge the distribution type sensing method of chaos optical signal, its It is characterized in that two kinds of method for sensing and its monitoring step of system of the sensor-based system are as follows：The first method for sensing is " to be based on cloth In deep pool scattering distributed optical time-domain analysis method for sensing ", correspond to the first line connection control mode, its course of work is supervised Surveying step is：1) the continuous optical signal of direct current of the laser module output enters the first coupler, the first coupler through first annular device Optical signal is divided into two-way, the tunnel output signal (3-2) of the first coupler (3) second enters the second coupling through the first optoisolator (6) Clutch (7)；First coupler (3) first via exports (3-1) and disconnected by photoswitch (4), does not access subsequent optical path；Second coupler (7) input signal is divided into two-way：Wherein the first via (7-1) signal after the first Polarization Controller (8) by the first Electro-optical Modulation Device (9) is modulated into pumping light pulse, after pumping light pulse is amplified by the first image intensifer (10), enters through the second circulator (20) Testing fiber (19) forms pumping road signal；Another way optical signal is connected to the second Polarization Controller (11), after by the second electric light adjust Detection optical signal is formed after device (12) shift frequency processed, detection optical signal is through optical delay line (15), the second image intensifer (16), scrambler (17), the second optoisolator (18) enters testing fiber；2) the electric signal modulation module 13 and bias control module 14 control the first electrooptic modulator 9, it is exported pump light Pulse, the second electrooptic modulator 12 is controlled, by stoke corresponding to detectable signal centre frequency shift frequency to laser center wavelength Near this light frequency；3) transducing signal in the testing fiber enters adjustable light wave-filter (21) through the second circulator (20) output, adjustable The Brillouin spectrum of humorous optical filter (21) output delivers to data acquisition and procession module after photoelectric detection module (22) conversion (23)；4) data acquisition and procession module 23 will electric signal carry out analog-to-digital conversion and store after, data are amplified, noise reduction, filter The analyzing and processing such as the Monitoring Data after the basic handlings such as ripple to system carries out curve fitting, the extraction of feature recognition, center frequency points, Corresponding temperature, strain variation amount are calculated, provides monitoring result.
- 4. according to claim 1,2 based on Brillouin scattering and merge the distribution type sensing method of chaos optical signal and be System, it is characterised in that when system is operated under CHAOS-BOCDA patterns, its line connection control mode and monitoring step are as follows：1) b, c port of the continuous optical signal through first annular device (2) that the laser module 1 exports enters the first coupler (3), optical signal is divided into two-way by the first coupler, wherein the optical signal of first coupler first via output (3-1) is through photoswitch (4), chaotic laser light signal generation control module (5), a ports of first annular device (2) feed back to laser module (1), this time Road is used to form stable chaos optical signal；The optical signal of the tunnel (3-2) of first coupler (3) second output is through the first optoisolator (6) the second coupler (7) is entered, input signal is divided into two-way by the second coupler：The wherein second coupler first via (7-1) is believed Number exporting stable chaos optical signal through the first Polarization Controller (8), the first electrooptic modulator (9), electrooptic modulator is uncomfortable herein Pulse processed, after chaotic signal is amplified by the first image intensifer (10), formed through the second circulator (20) into testing fiber (19) Chaos pump signal；The stable chaos detectable signal of the road 7-2 of second coupler (7) second outputs is through the second Polarization Controller (11) Detection optical signal is formed after the shift frequency of the second electrooptic modulator 12 afterwards, detection optical signal is through optical delay line (15), the second light amplification Device (16), scrambler (17), the second optoisolator (18) enter testing fiber (19)；2) the electric signal modulation module (13) and bias control module (14) control the first electrooptic modulator, adjust the first electric light Device extinction ratio processed minimizes and exports stable chaos pump signal, the second electrooptic modulator of control (12), by detectable signal Corresponding to centre frequency shift frequency to laser center wavelength near Stokes light frequency；3) the chaos transducing signal in the testing fiber enters adjustable light wave-filter through the output of the second circulator (20) c ports (21), the Brillouin spectrum of adjustable light wave-filter output delivers to data acquisition and procession mould after photoelectric detection module (22) conversion Block (23)；4) data acquisition and procession module will electric signal carry out analog-to-digital conversion and store after, data are amplified, noise reduction, filtering Etc. the Monitoring Data of system is carried out curve fitting after basic handling, the analyzing and processing such as feature recognition, center frequency points extraction, meter Corresponding temperature, strain variation amount are calculated, provides monitoring result.
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