CN104019836A - Brillouin optical-time-domain analyzer based on coherence dual-pulse pair sequence technology and method for restraining common-mode noise by utilizing same - Google Patents
Brillouin optical-time-domain analyzer based on coherence dual-pulse pair sequence technology and method for restraining common-mode noise by utilizing same Download PDFInfo
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Abstract
The invention relates to a Brillouin optical-time-domain analyzer based on a coherence dual-pulse pair sequence technology and a method for restraining common-mode noise by utilizing the same, belongs to the field of optics, and solves the problems that a traditional Brillouin optical-time-domain analyzer is low in spatial resolution, long in measuring signal time and low in signal-to-noise ratio. A laser is adopted, an upper branch of light divided by an optical-fiber coupler I is used as pump light, pulse pairs with different pulse widths can be periodically generated by a field-programmable logic array in a programming manner, and the pulse pairs are continuously and optically modulated to form a coherence pulse pair sequence through a photoelectric modulator; a lower branch provides detection light, the detection light enters a photoelectric modulator after a polarization state is adjusted, upper marginal frequency light and lower marginal frequency light which having the frequency difference of Brillouin frequency shifting gamma B are generated on the basis of carrier light, the pump light consisting of the coherence pulse pair sequence and the modulated detection light has a Brillouin scattering phenomenon in a sensing optical fiber, and two Brillouin signals are detected by a photoelectric detector. The Brillouin optical-time-domain analyzer and the method are suitable for restraining the common-mode noise.
Description
Technical field
The invention belongs to optical field, relate to the time-domain analysis instrument based on relevant dual-pulse time series technique and utilize this analyser to suppress the method for common-mode noise.
Background technology
In recent years, Brillouin optical time domain analysis instrument has been subject to widely paying close attention to as Distributed Optical Fiber Sensing Techniques Typical Representative, has obtained effective application multi-field.Compared with other Fibre Optical Sensor instruments, Brillouin optical time domain analysis instrument has the advantages such as high spatial resolution, overlength distance sensing and kinetic measurement, can carry out high-acruracy survey to the physical quantity such as temperature and microstrain simultaneously.Because optical fiber is not only as senser element but also as signal channel, using light signal as signal transmission, therefore can effectively reduce infrastructure cost.This class sensor apparatus is widely used in oil pipeline detection, bridge and building structure health monitoring, long apart from aspects such as highway health monitoring and fire alarms.In addition, Brillouin optical time domain analysis instrument is also applied to temperature and the strain monitoring of seabed or land high-tension cable, and geologic hazard, such as distributed monitoring of landslide, rubble flow etc. etc., is applied in special extreme working environment.
In Brillouin optical time domain analysis instrument development process, how to improve spatial resolution, how shortening Measuring Time, promoting signal to noise ratio (S/N ratio) is several problems that receive much concern, extensively probe into.Measuring Time and signal to noise ratio (S/N ratio) as one of major criterion to sensor superior and inferior evaluating, are also restricting the development of Fibre Optical Sensor always always.Particularly, in long-distance sensing field, the problem that sensing time is long, signal to noise ratio (S/N ratio) is too low is perplexing researcher always.Therefore, looking for a kind of method that can shorten Measuring Time, raising signal to noise ratio (S/N ratio) is one of gordian technique of existing Brillouin optical time domain analysis instrument development.
At present, the scheme of a kind of dipulse difference of widespread use pulsewidth promotes signal to noise ratio (S/N ratio), improves spatial resolution.This scheme is squeezed into the pulsed light of distinct pulse widths at twice as pump light, receive Brillouin's signal Li W with detection light action respectively, Bao X, Li Y, et al.Differential pulse-width pair BOTDA for high spatial resolution sensing[J] .Optics express, 1908,16 (26): 21616-21625..But the pulses switch time that this scheme need to be longer, Measuring Time is longer.And twice Brillouin's signal of chien shih has different common-mode noises when longer pulses switch, can not effectively suppress common-mode noise after doing difference processing, can not increase substantially signal to noise ratio (S/N ratio).
Summary of the invention
The present invention is that existing Brillouin optical time domain analysis instrument spatial resolution is low and the measuring-signal time is long in order to solve, the problem that signal to noise ratio (S/N ratio) is low, has proposed based on relevant dual-pulse time series technique Brillouin optical time domain analysis instrument and has utilized this analyser to suppress the method that common mode is made an uproar.
Of the present invention based on relevant dual-pulse time series technique Brillouin optical time domain analysis instrument, this analyser comprises laser instrument, a fiber coupler, a Polarization Controller, No. two Polarization Controllers, adjustable D. C regulated, an electrooptic modulator, field programmable gate array, microwave generator, No. two electrooptic modulators, photoelectric switching circuit, No. two fiber couplers, Fiber Bragg Grating FBG, an optical fiber circulator, Erbium-Doped Fiber Amplifier (EDFA), data collecting card, fibre optic isolater 1, disturb inclined to one side instrument, photodetector, No. two optical fiber circulators and sensor fibre,
The continuous laser of laser instrument transmitting is divided into two bundle continuous lights through a fiber coupler, this two bundles continuous light is incident to respectively a Polarization Controller and No. two Polarization Controllers, polarized light after a Polarization Controller is incident to electrooptic modulator No. one, a relevant dipulse sequence light signal of electrooptic modulator output after field programmable gate array drives, described relevant dipulse sequence light signal is divided into two row coherent pulse sequence light signals after No. two fiber couplers, the relevant dipulse sequence light signal of these two row is incident to respectively the light-sensitive surface of Erbium-Doped Fiber Amplifier (EDFA) and photoelectric switching circuit, the electric signal obtaining through photoelectric switching circuit conversion inputs to the conditioning signal input end of adjustable D. C regulated,
Relevant dipulse sequence light signal after Erbium-Doped Fiber Amplifier (EDFA) amplifies is disturbed No. 1 port that is incident to No. two optical fiber circulators to the rear through disturbing inclined to one side instrument, and the relevant dipulse sequence light signal of No. 2 port outputs of No. two optical fiber circulators is incident to one end of sensor fibre,
The bias voltage adjustment signal output part of adjustable D. C regulated connects the voltage signal input end of an electrooptic modulator;
Polarized light after No. two Polarization Controllers is incident to electrooptic modulator No. two, the driving signal output part of microwave generator connects the driving signal input of No. two electrooptic modulators, light beam after No. two electrooptic modulator modulation is incident to No. 1 port of an optical fiber circulator, after No. 2 port outputs of an optical fiber circulator, be incident to Fiber Bragg Grating FBG, detection light after Fiber Bragg Grating FBG frequency-selective filtering is from No. 3 port outputs of an optical fiber circulator, the light beam of exporting from No. 3 ports of an optical fiber circulator is incident to the other end of sensor fibre after fibre optic isolater,
In sensor fibre, there is stimulated Brillouin scattering effect with the detection light after fibre optic isolater in the relevant dipulse sequence light signal of No. 2 port outputs of No. two optical fiber circulators, the detection light that sense light inscattering goes out is incident to number port of No. two optical fiber circulators, the light signal of launching through No. 3 ports of No. two optical fiber circulators is incident on the light-sensitive surface of photodetector, electric signal after photodetector conversion is sent to the data-signal input end of data collecting card, the trigger pip output terminal connection data capture card data acquisition control signal input part of field programmable gate array.
Utilize the above-mentioned method that suppresses common-mode noise based on relevant dual-pulse time series technique Brillouin optical time domain analysis instrument, the concrete steps of the method:
The power supply transmitting continuous laser beam of step 1, unlatching laser instrument, is divided into two bundle continuous lights in the ratio of 1:1 by continuous laser beam through a fiber coupler;
Step 2, function generator produce electric impulse signal and drive the relevant dual-pulse sequence light signal of electrooptic modulator output;
In described relevant dual-pulse sequence, the duration of pulse of previous pulse is τ
1, the duration of pulse of a rear pulse is τ
2, the recurrent interval is Δ τ, relevant dual-pulse sequence time is spaced apart τ
coherent; Be less than pulse to sequence interference time τ with the interval delta τ of set of pulses centering two pulses
coherent, i.e. Δ τ < τ
coherent;
Step 3, relevant dual-pulse sequence light signal are disturbed partially through disturbing inclined to one side instrument after Erbium-Doped Fiber Amplifier (EDFA) amplifies, and will disturb relevant dual-pulse sequence to the rear and be incident to No. 1 port of No. two optical fiber circulators, be emitted to one end of sensor fibre through No. 2 ports of No. two optical fiber circulators;
Relevant dual-pulse sequence light signal is sent to the conditioning signal input end of adjustable D. C regulated 5 after changing by photoelectric switching circuit simultaneously, and adjustable D. C regulated regulates the voltage of an electrooptic modulator;
Step 4, the microwave signal of utilizing microwave generator to produce, and microwave signal is loaded with the continuous light of No. two electrooptic modulator receptions and superposeed, and the continuous light after stack is emitted to No. 1 port of an optical fiber circulator;
The microwave signal of utilizing microwave generator to produce, and the continuous light of microwave signal and No. two electrooptic modulator receptions is superposeed: continuous light is Brillouin shift ν by the side frequency deviation of No. two electrooptic modulator generations
b, the continuous light frequency of acquisition is ν
0± ν
band ν
0, wherein ν
0for the frequency of laser instrument 1;
Step 5, be incident to an optical fiber circulator light beam through Fiber Bragg Grating FBG filtering lower side frequency, obtain continuous upper side frequency light, continuously upper side frequency light is emitted to the other end of sensor fibre after fibre optic isolater;
Step 6, continuous upper side frequency light and disturb relevant dual-pulse sequence light signal to the rear stimulated Brillouin scattering effect occurs in sensor fibre;
Step 7, detection light after stimulated Brillouin scattering effect are incident on the light-sensitive surface of photodetector after No. two optical fiber circulators, photodetector is converted to the light signal receiving electric signal and is sent to data collecting card, obtains brillouin scattering signal;
Step 8, adopt differential data disposal route to remove pulse in the brillouin scattering signal that step 7 obtains, to corresponding two total common-mode noises of back scattering Brillouin signal, to realize the inhibition to common-mode noise.
Based on the second technical scheme of relevant dual-pulse time series technique Brillouin optical time domain analysis instrument, this analyser comprises laser instrument, a fiber coupler, a Polarization Controller, No. two Polarization Controllers, adjustable D. C regulated, an electrooptic modulator, field programmable gate array, microwave generator, No. two electrooptic modulators, photoelectric switching circuit, No. two fiber couplers, Fiber Bragg Grating FBG, an optical fiber circulator, Erbium-Doped Fiber Amplifier (EDFA), data collecting card, fibre optic isolater, disturb inclined to one side instrument, photodetector, No. two optical fiber circulators, sensor fibre and function generator,
The continuous laser that laser instrument 1 is launched is divided into two bundle continuous lights through a fiber coupler, this two bundles continuous light is incident to respectively a Polarization Controller and No. two Polarization Controllers, polarized light after a Polarization Controller modulation is incident to electrooptic modulator No. one, a relevant dipulse sequence light signal of electrooptic modulator output after function generator drives, described relevant dipulse sequence light signal is divided into the relevant dipulse sequence light signal of two row after No. two fiber couplers, the relevant dipulse sequence light signal of these two row is incident to respectively the plane of incidence of Erbium-Doped Fiber Amplifier (EDFA) and the light-sensitive surface of photoelectric switching circuit, the electric signal obtaining through photoelectric switching circuit conversion inputs to the conditioning signal input end of adjustable D. C regulated,
Relevant dipulse sequence light signal after Erbium-Doped Fiber Amplifier (EDFA) amplifies is disturbed No. 1 port that is incident to No. two optical fiber circulators to the rear through disturbing inclined to one side instrument, and the relevant dipulse sequence light signal of No. 2 port outputs of No. two optical fiber circulators is incident to one end of sensor fibre,
The bias voltage adjustment signal output part of adjustable D. C regulated connects the voltage signal input end of an electrooptic modulator;
Polarized light after No. two Polarization Controller modulation is incident to electrooptic modulator No. two, the driving signal output part of microwave generator connects the driving signal input of No. two electrooptic modulators, light beam after No. two electrooptic modulator modulation is incident to No. 1 port of an optical fiber circulator, after No. 2 port outputs of an optical fiber circulator, be incident to Fiber Bragg Grating FBG, detection light after Fiber Bragg Grating FBG frequency-selective filtering is from No. 3 port outputs of an optical fiber circulator, the light beam of exporting from No. 3 ports of an optical fiber circulator is incident to the other end of sensor fibre after fibre optic isolater,
In sensor fibre, there is stimulated Brillouin scattering with the detection light after fibre optic isolater in the relevant dipulse sequence light signal of No. 2 port outputs of No. two optical fiber circulators, the light signal scattering is incident to No. 2 ports of No. two optical fiber circulators, the light signal of launching through No. 3 ports of No. two optical fiber circulators is incident on the light-sensitive surface of photodetector, electric signal after photodetector conversion is sent to the data-signal input end of data collecting card, the trigger pip output terminal connection data capture card data acquisition control signal input part of field programmable gate array.
Utilize the method that suppresses common-mode noise based on the second technical scheme of relevant dual-pulse time series technique Brillouin optical time domain analysis instrument, the concrete steps of the method are:
The power supply transmitting continuous laser beam of step 1, unlatching laser instrument 1, is divided into two bundle continuous lights in the ratio of 1:1 by continuous laser beam through a fiber coupler;
Step 2, function generator produce electric impulse signal and drive the relevant dual-pulse sequence light signal of electrooptic modulator output;
The duration of pulse that described relevant dipulse sequence is previous pulse in sequence is τ
1, the duration of pulse of a rear pulse is τ
2, the recurrent interval is Δ τ, relevant dual-pulse sequence time is spaced apart τ
coherent; Be less than pulse to sequence interference time τ with the interval delta τ of set of pulses centering two pulses
coherent, i.e. Δ τ < τ
coherent;
Step 3, relevant dual-pulse sequence light signal are disturbed partially through disturbing inclined to one side instrument after Erbium-Doped Fiber Amplifier (EDFA) amplifies, and will disturb relevant dual-pulse sequence light signal to the rear and be incident to No. 1 port of No. two optical fiber circulators, be emitted to one end of sensor fibre through No. 2 ports of No. two optical fiber circulators;
Relevant dual-pulse sequence light signal is filled and is changed the conditioning signal input end that is sent to adjustable D. C regulated after circuit conversion by photoelectricity simultaneously, and adjustable D. C regulated regulates the voltage of an electrooptic modulator 6;
Step 4, the microwave signal of utilizing microwave generator to produce, and microwave signal is loaded with the continuous light of No. two electrooptic modulator receptions and superposeed, and the continuous light after stack is emitted to No. 1 port of an optical fiber circulator;
The microwave signal of utilizing microwave generator to produce, and the continuous light of microwave signal and No. two electrooptic modulator receptions is superposeed: continuous light is Brillouin shift ν by the side frequency deviation of No. two electrooptic modulator generations
b, the continuous light frequency of acquisition is ν
0± ν
band ν
0, wherein ν
0for the frequency of laser instrument 1;
Step 5, be incident to an optical fiber circulator light beam through Fiber Bragg Grating FBG filtering lower side frequency, obtain continuous upper side frequency light, continuously upper side frequency light is emitted to the other end of sensor fibre after fibre optic isolater;
Step 6, continuous upper side frequency light and disturb relevant dual-pulse sequence light signal to the rear stimulated Brillouin scattering occurs in sensor fibre;
Light signal after step 7, Brillouin scattering is incident on the light-sensitive surface of photodetector after No. two optical fiber circulators, and electric explorer is converted to the light signal receiving electric signal and is sent to data collecting card, obtains brillouin scattering signal;
Step 8, adopt differential data disposal route to remove pulse in the brillouin scattering signal that step 7 obtains, to corresponding two total common-mode noises of back scattering Brillouin signal, to realize the inhibition to common-mode noise.
Based on the third technical scheme of relevant dual-pulse time series technique Brillouin optical time domain analysis instrument, this time-domain analysis instrument comprises laser instrument, fiber coupler, Polarization Controller, No. two Polarization Controllers, adjustable D. C regulated, electrooptic modulator, field programmable gate array, microwave generator, photoelectric switching circuit, No. two fiber couplers, Erbium-Doped Fiber Amplifier (EDFA), data collecting card, fibre optic isolaters, disturbs inclined to one side instrument, photodetector, No. two optical fiber circulators, sensor fibre and single side-band modulators;
The two bundle continuous lights of the continuous laser of laser instrument transmitting after a fiber coupler are incident to respectively a Polarization Controller and No. two Polarization Controllers, polarized light after a Polarization Controller modulation is incident to electrooptic modulator No. one, No. one electrooptic modulator is exported coherent pulse sequence after field programmable gate array drives, the two row relevant dipulse sequence of relevant dipulse sequence after No. two fiber couplers is incident to respectively the light-sensitive surface of Erbium-Doped Fiber Amplifier (EDFA) and adjustable D. C regulated, after amplifying, Erbium-Doped Fiber Amplifier (EDFA) disturbs dry pulse train to the rear and is incident to No. 1 port of No. two optical fiber circulators through disturbing inclined to one side instrument, the relevant dipulse sequence of No. 2 port outputs of No. two optical fiber circulators is incident to one end of sensor fibre,
The bias voltage adjustment signal output part of adjustable D. C regulated connects the voltage signal input end of an electrooptic modulator;
Polarized light after No. two Polarization Controller modulation is incident to single side-band modulator, the driving signal output part of microwave generator connects the driving signal input of single side-band modulator, and the light beam after single side-band modulator modulation is incident to the other end of sensor fibre after fibre optic isolater;
In sensor fibre, there is stimulated Brillouin scattering with the detection light after fibre optic isolater in the relevant dipulse sequence light signal of No. 2 port outputs of No. two optical fiber circulators, the light signal scattering is disturbed No. 2 ports that are incident to No. two optical fiber circulators to the rear through disturbing inclined to one side instrument, the light signal of launching through No. 3 ports of No. two optical fiber circulators is incident on the light-sensitive surface of photodetector, electric signal after photodetector conversion is sent to the data-signal input end of data collecting card, the trigger pip output terminal connection data capture card data acquisition control signal input part of field programmable gate array.
The present invention adopts a laser instrument, the upper branch road light being divided into by fiber coupler is as pump light, upper tributary signal enters electrooptic modulator No. one after a Polarization Controller regulates polarization state, can make field programmable gate array periodically produce the pulse pair with different pulse widths by programming, pulse is modulated the light signal by electrooptic modulator electric signal, makes the continuous light that laser instrument sends become coherent pulse to sequence; Be τ with a set of pulses to the duration of pulse of previous pulse in sequence
1, the duration of pulse of a rear pulse is τ
2, the recurrent interval is Δ τ, relevant dual-pulse sequence time is spaced apart τ
coherent, because the interval delta τ of same set of pulses centering two pulses is less than pulse to sequence interference time τ
coherent, i.e. Δ τ < τ
coherent, be therefore coherent pulse with a set of pulses to the two pulses comprising; The coherent pulse forming is amplified to required power by Erbium-Doped Fiber Amplifier (EDFA) pumping pulse to sequence, then by circulator, is connected to the other end of sensor fibre after disturbing inclined to one side instrument change polarization state.
Lower branch road provides detection light, regulates after polarization state and enters electrooptic modulator, and the effect of an electrooptic modulator is that microwave signal that microwave generator is produced is loaded into and surveys on light, and on glistening light of waves basis, to produce frequency difference be Brillouin shift ν publishing originally
bupper lower side frequency light, its frequency is respectively ν
0± ν
b, wherein ν
0for former laser frequency.Utilize Fiber Bragg Grating FBG to leach upper side frequency frequency for ν
0-ν
b, then enter in sensor fibre through a circulator.
There is stimulated Brillouin scattering phenomenon in the detection light after pump light and the modulation of coherent pulse to sequence composition, photodetector detects two Brillouin's signals in sensor fibre.Due to Δ, τ is very little, and approximate regarding as injected two bundle coherent pulses simultaneously, saved the pulses switch time, and Measuring Time has been shortened to half; Brillouin's signal is done to difference processing, removed common-mode noise, realized the inhibition to common-mode noise, significantly improved signal to noise ratio (S/N ratio).
Brief description of the drawings
Fig. 1 is the principle schematic based on relevant dual-pulse time series technique Brillouin optical time domain analysis instrument of the present invention;
Fig. 2 is the principle schematic based on relevant dual-pulse time series technique Brillouin optical time domain analysis instrument described in embodiment four;
Fig. 3 is the principle schematic based on relevant dual-pulse time series technique Brillouin optical time domain analysis instrument described in embodiment five;
Fig. 4 is relevant dual-pulse sequence schematic diagram.
Embodiment
Embodiment one, in conjunction with Fig. 1, Fig. 4 illustrates present embodiment, described in present embodiment based on relevant dual-pulse time series technique Brillouin optical time domain analysis instrument, this analyser comprises laser instrument 1, a fiber coupler 2, a Polarization Controller 3, No. two Polarization Controllers 4, adjustable D. C regulated 5, an electrooptic modulator 6, field programmable gate array 7, microwave generator 8, No. two electrooptic modulators 9, photoelectric switching circuit 10, No. two fiber couplers 11, Fiber Bragg Grating FBG 12, an optical fiber circulator 13, Erbium-Doped Fiber Amplifier (EDFA) 14, data collecting card 15, fibre optic isolater 16, disturb inclined to one side instrument 17, photodetector 18, No. two optical fiber circulators 19 and sensor fibre 20,
The continuous laser that laser instrument 1 is launched is divided into two bundle continuous lights through a fiber coupler 2, this two bundles continuous light is incident to respectively a Polarization Controller 3 and No. two Polarization Controllers 4, polarized light after a Polarization Controller 3 is incident to electrooptic modulator 6 No. one, an electrooptic modulator 6 relevant dipulse sequence light signal of output after field programmable gate array 7 drives, described relevant dipulse sequence light signal is divided into two row coherent pulse sequence light signals after No. two fiber couplers 11, the relevant dipulse sequence light signal of these two row is incident to respectively the light-sensitive surface of Erbium-Doped Fiber Amplifier (EDFA) 14 and photoelectric switching circuit 10, the electric signal obtaining through photoelectric switching circuit 10 conversions inputs to the conditioning signal input end of adjustable D. C regulated 5,
Relevant dipulse sequence light signal after Erbium-Doped Fiber Amplifier (EDFA) 14 amplifies is disturbed No. 1 port that is incident to No. two optical fiber circulators 19 to the rear through disturbing inclined to one side instrument 17, the relevant dipulse sequence light signal of No. 2 port outputs of No. two optical fiber circulators 19 is incident to one end of sensor fibre 20
The bias voltage adjustment signal output part of adjustable D. C regulated 5 connects the voltage signal input end of an electrooptic modulator 6;
Polarized light after No. two Polarization Controllers 4 is incident to electrooptic modulator 9 No. two, the driving signal output part of microwave generator 8 connects the driving signal input of No. two electrooptic modulators 9, light beam after No. two electrooptic modulator 9 modulation is incident to No. 1 port of an optical fiber circulator 13, after No. 2 port outputs of an optical fiber circulator 13, be incident to Fiber Bragg Grating FBG 12, detection light after Fiber Bragg Grating FBG 12 frequency-selective filterings is from No. 3 port outputs of an optical fiber circulator 13, the light beam of exporting from No. 3 ports of an optical fiber circulator 13 is incident to the other end of sensor fibre 20 after fibre optic isolater 16,
The relevant dipulse sequence light signal of No. 172 port outputs of No. two optical fiber circulators and the detection light after fibre optic isolater 16 are in the effect of the interior generation stimulated Brillouin scattering of sensor fibre 20, the detection light that sensor fibre 20 inscatterings go out is incident to No. 2 ports of No. two optical fiber circulators 17, the light signal of launching through No. 3 ports of No. two optical fiber circulators 17 is incident on the light-sensitive surface of photodetector 18, electric signal after photodetector 18 conversions is sent to the data-signal input end of data collecting card 15, the trigger pip output terminal connection data capture card 15 data acquisition control signal input parts of field programmable gate array 7.
Embodiment two, present embodiment be to described in embodiment one based on the further illustrating of relevant dual-pulse time series technique Brillouin optical time domain analysis instrument, laser instrument 1 adopts tunable laser or distributed feedback type semiconductor laser.
Embodiment three, present embodiment be to described in embodiment one based on the further illustrating of relevant dual-pulse time series technique Brillouin optical time domain analysis instrument, sensor fibre 20 adopts single-mode fiber or polarization maintaining optical fibre.
Embodiment four, in conjunction with Fig. 2, present embodiment is described, described in present embodiment based on relevant dual-pulse time series technique Brillouin optical time domain analysis instrument, this analyser comprises laser instrument 1, a fiber coupler 2, a Polarization Controller 3, No. two Polarization Controllers 4, adjustable D. C regulated 5, an electrooptic modulator 6, field programmable gate array 7, microwave generator 8, No. two electrooptic modulators 9, photoelectric switching circuit 10, No. two fiber couplers 11, Fiber Bragg Grating FBG 12, an optical fiber circulator 13, Erbium-Doped Fiber Amplifier (EDFA) 14, data collecting card 15, fibre optic isolater 16, disturb inclined to one side instrument 17, photodetector 18, No. two optical fiber circulators 19, sensor fibre 20 and function generator 21,
The continuous laser that laser instrument 1 is launched is divided into two bundle continuous lights through a fiber coupler 2, this two bundles continuous light is incident to respectively a Polarization Controller 3 and No. two Polarization Controllers 4, polarized light after Polarization Controller 3 modulation is incident to electrooptic modulator 6 No. one, an electrooptic modulator 6 relevant dipulse sequence light signal of output after function generator 21 drives, described relevant dipulse sequence light signal is divided into the relevant dipulse sequence light signal of two row after No. two fiber couplers 11, the relevant dipulse sequence light signal of these two row is incident to respectively the plane of incidence of Erbium-Doped Fiber Amplifier (EDFA) 14 and the light-sensitive surface of photoelectric switching circuit 10, the electric signal obtaining through photoelectric switching circuit 10 conversions inputs to the conditioning signal input end of adjustable D. C regulated 5,
Relevant dipulse sequence light signal after Erbium-Doped Fiber Amplifier (EDFA) 14 amplifies is disturbed No. 1 port that is incident to No. two optical fiber circulators 19 to the rear through disturbing inclined to one side instrument 17, the relevant dipulse sequence light signal of No. 2 port outputs of No. two optical fiber circulators 19 is incident to one end of sensor fibre 20
The bias voltage adjustment signal output part of adjustable D. C regulated 5 connects the voltage signal input end of an electrooptic modulator 6;
Polarized light after No. two Polarization Controller 4 modulation is incident to electrooptic modulator 9 No. two, the driving signal output part of microwave generator 8 connects the driving signal input of No. two electrooptic modulators 9, light beam after No. two electrooptic modulator 9 modulation is incident to No. 1 port of an optical fiber circulator 13, after No. 2 port outputs of an optical fiber circulator 13, be incident to Fiber Bragg Grating FBG 12, detection light after Fiber Bragg Grating FBG 12 frequency-selective filterings is from No. 3 port outputs of an optical fiber circulator 13, the light beam of exporting from No. 3 ports of an optical fiber circulator 13 is incident to the other end of sensor fibre 20 after fibre optic isolater 16,
The relevant dipulse sequence light signal of No. 2 port outputs of No. two optical fiber circulators 19 and the detection light after fibre optic isolater 16 are in the interior generation stimulated Brillouin scattering of sensor fibre 20, the light signal scattering is incident to No. 2 ports of No. two optical fiber circulators 19, the light signal of launching through No. 3 ports of No. two optical fiber circulators 19 is incident on the light-sensitive surface of photodetector 18, electric signal after photodetector 18 conversions is sent to the data-signal input end of data collecting card 15, the trigger pip output terminal connection data capture card 15 data acquisition control signal input parts of field programmable gate array 7.
Embodiment five, in conjunction with Fig. 3, present embodiment is described, described in present embodiment based on relevant dual-pulse time series technique Brillouin optical time domain analysis instrument, this time-domain analysis instrument comprises laser instrument 1, a fiber coupler 2, a Polarization Controller 3, No. two Polarization Controllers 4, adjustable D. C regulated 5, an electrooptic modulator 6, field programmable gate array 7, microwave generator 8, photoelectric switching circuit 10, No. two fiber couplers 11, Erbium-Doped Fiber Amplifier (EDFA) 14, data collecting card 15, fibre optic isolater 16, disturb inclined to one side instrument 17, photodetector 18, No. two optical fiber circulators 19, sensor fibre 20 and single side-band modulator 22,
The two bundle continuous lights of the continuous laser that laser instrument 1 is launched after a fiber coupler 2 are incident to respectively a Polarization Controller 3 and No. two Polarization Controllers 4, polarized light after Polarization Controller 3 modulation is incident to electrooptic modulator 6 No. one, No. one electrooptic modulator 6 is exported coherent pulse sequence after field programmable gate array 7 drives, the two row relevant dipulse sequence of relevant dipulse sequence after No. two fiber couplers 11 is incident to respectively the light-sensitive surface of Erbium-Doped Fiber Amplifier (EDFA) 14 and adjustable D. C regulated 5, after amplifying, Erbium-Doped Fiber Amplifier (EDFA) 14 disturbs dry pulse train to the rear and is incident to No. 1 port of No. two optical fiber circulators 19 through disturbing inclined to one side instrument 17, the relevant dipulse sequence of No. 192 port outputs of No. two optical fiber circulators is incident to one end of sensor fibre 20,
The bias voltage adjustment signal output part of adjustable D. C regulated 5 connects the voltage signal input end of an electrooptic modulator 6;
Polarized light after No. two Polarization Controller 4 modulation is incident to single side-band modulator 22, the driving signal output part of microwave generator 8 connects the driving signal input of single side-band modulator 22, and the light beam after single side-band modulator 22 modulation is incident to the other end of sensor fibre 20 after fibre optic isolater 16;
The relevant dipulse sequence light signal of No. 192 port outputs of No. two optical fiber circulators and the detection light after fibre optic isolater 16 are in the interior generation stimulated Brillouin scattering of sensor fibre 20, the light signal scattering is disturbed No. 2 ports that are incident to No. two optical fiber circulators 17 to the rear through disturbing inclined to one side instrument 19, the light signal of launching through No. 3 ports of No. two optical fiber circulators 17 is incident on the light-sensitive surface of photodetector 18, electric signal after photodetector 18 conversions is sent to the data-signal input end of data collecting card 15, the trigger pip output terminal connection data capture card 15 data acquisition control signal input parts of field programmable gate array 7.
Embodiment six, present embodiment are to utilize to suppress the method for common-mode noise, the concrete steps of the method based on relevant dual-pulse time series technique Brillouin optical time domain analysis instrument described in embodiment one:
The power supply transmitting continuous laser beam of step 1, unlatching laser instrument 1, is divided into two bundle continuous lights in the ratio of 1:1 by continuous laser beam through a fiber coupler 2;
Step 2, function generator 21 produce electric impulse signal and drive the relevant dual-pulse sequence light signal of electrooptic modulator 6 output;
In described relevant dual-pulse sequence, the duration of pulse of previous pulse is τ
1, the duration of pulse of a rear pulse is τ
2, the recurrent interval is Δ τ, relevant dual-pulse sequence time is spaced apart τ
coherent; Be less than pulse to sequence interference time τ with the interval delta τ of set of pulses centering two pulses
coherent, i.e. Δ τ < τ
coherent;
Step 3, relevant dual-pulse sequence light signal are disturbed partially through disturbing inclined to one side instrument 17 after Erbium-Doped Fiber Amplifier (EDFA) 14 amplifies, and will disturb relevant dual-pulse sequence to the rear and be incident to No. 1 port of No. two optical fiber circulators 19, be emitted to one end of sensor fibre 20 through No. 2 ports of No. two optical fiber circulators 19;
Relevant dual-pulse sequence light signal is sent to the conditioning signal input end of adjustable D. C regulated 5 after changing by photoelectric switching circuit 10 simultaneously, and adjustable D. C regulated 5 regulates the voltage of an electrooptic modulator 6;
Step 4, the microwave signal of utilizing microwave generator 8 to produce, and microwave signal is loaded to the continuous light receiving with No. two electrooptic modulators 9 superpose, and the continuous light after stack is emitted to No. 1 port of an optical fiber circulator 13;
The microwave signal of utilizing microwave generator 8 to produce, and the continuous light that microwave signal and No. two electrooptic modulators 9 receive is superposeed: the side frequency deviation that continuous light produces by No. two electrooptic modulators 9 is Brillouin shift ν
b, the continuous light frequency of acquisition is ν
0± ν
band ν
0, wherein ν
0for the frequency of laser instrument 1;
Step 5, be incident to an optical fiber circulator 13 light beam through Fiber Bragg Grating FBG 12 filtering lower side frequencies, obtain continuous upper side frequency light, continuously upper side frequency light is emitted to the other end of sensor fibre 20 after fibre optic isolater 16;
Step 6, continuous upper side frequency light and disturb relevant dual-pulse sequence light signal to the rear stimulated Brillouin scattering effect occurs in sensor fibre 20;
Step 7, detection light after stimulated Brillouin scattering effect are incident on the light-sensitive surface of photodetector 18 after No. two optical fiber circulators 17, photodetector 18 is converted to electric signal by the light signal receiving and is sent to data collecting card 15, obtains brillouin scattering signal;
Step 8, adopt differential data disposal route to remove pulse in the brillouin scattering signal that step 7 obtains, to corresponding two total common-mode noises of back scattering Brillouin signal, to realize the inhibition to common-mode noise.
Embodiment seven, present embodiment are to utilize to suppress the method for common-mode noise based on relevant dual-pulse time series technique Brillouin optical time domain analysis instrument described in embodiment four, and the concrete steps of the method are:
The power supply transmitting continuous laser beam of step 1, unlatching laser instrument 1, is divided into two bundle continuous lights in the ratio of 1:1 by continuous laser beam through a fiber coupler 2;
Step 2, function generator 21 produce electric impulse signal and drive the relevant dual-pulse sequence light signal of electrooptic modulator 6 output;
The duration of pulse that described relevant dipulse sequence is previous pulse in sequence is τ
1, the duration of pulse of a rear pulse is τ
2, the recurrent interval is Δ τ, relevant dual-pulse sequence time is spaced apart τ
coherent; Be less than pulse to sequence interference time τ with the interval delta τ of set of pulses centering two pulses
coherent, i.e. Δ τ < τ
coherent;
Step 3, relevant dual-pulse sequence light signal are disturbed partially through disturbing inclined to one side instrument 17 after Erbium-Doped Fiber Amplifier (EDFA) 14 amplifies, and will disturb relevant dual-pulse sequence light signal to the rear and be incident to No. 1 port of No. two optical fiber circulators 19, be emitted to one end of sensor fibre 20 through No. 2 ports of No. two optical fiber circulators 19;
Relevant dual-pulse sequence light signal is filled and is changed the conditioning signal input end that is sent to adjustable D. C regulated 5 after circuit 10 is changed by photoelectricity simultaneously, and adjustable D. C regulated 5 regulates the voltage of an electrooptic modulator 6;
Step 4, the microwave signal of utilizing microwave generator 8 to produce, and microwave signal is loaded to the continuous light receiving with No. two electrooptic modulators 9 superpose, and the continuous light after stack is emitted to No. 1 port of an optical fiber circulator 13;
The microwave signal of utilizing microwave generator 8 to produce, and the continuous light that microwave signal and No. two electrooptic modulators 9 receive is superposeed: the side frequency deviation that continuous light produces by No. two electrooptic modulators 9 is Brillouin shift ν
b, the continuous light frequency of acquisition is ν
0± ν
band ν
0, wherein ν
0for the frequency of laser instrument 1;
Step 5, be incident to an optical fiber circulator 13 light beam through Fiber Bragg Grating FBG 12 filtering lower side frequencies, obtain continuous upper side frequency light, continuously upper side frequency light is emitted to the other end of sensor fibre 20 after fibre optic isolater 16;
Step 6, continuous upper side frequency light and disturb relevant dual-pulse sequence light signal to the rear, in sensor fibre 20, stimulated Brillouin scattering occurs;
Light signal after step 7, Brillouin scattering is incident on the light-sensitive surface of photodetector 18 after No. two optical fiber circulators 17, and electric explorer 18 is converted to electric signal by the light signal receiving and is sent to data collecting card 15, obtains brillouin scattering signal;
Step 8, adopt differential data disposal route to remove pulse in the brillouin scattering signal that step 7 obtains, to corresponding two total common-mode noises of back scattering Brillouin signal, to realize the inhibition to common-mode noise.
The specific implementation method of the differential data processing described in the present invention is:
Collect two continuous brillouin scattering signals by photodetector 18, the correspondence position of two adjacent signals has been carried out to subtracting each other in data and do poor processing to remove total common-mode noise.
The present invention has advantages of following:
1. the present invention proposes to have the advantages such as high spatial resolution, quick, high s/n ratio is high based on relevant dual-pulse time series technique Brillouin optical time domain analysis instrument, because pump light adopts coherent pulse to sequence, omit the pulses switch time, reduce half Measuring Time, reach the effect of Quick Measurement.
2. detector receives Brillouin's signal twice simultaneously, and twice Brillouin's signal has identical common-mode noise.By data are carried out to difference processing, can effectively remove common-mode noise, strengthen signal to noise ratio (S/N ratio).
Claims (7)
1. based on relevant dual-pulse time series technique Brillouin optical time domain analysis instrument, it is characterized in that, this analyser comprises laser instrument (1), a fiber coupler (2), a Polarization Controller (3), No. two Polarization Controllers (4), adjustable D. C regulated (5), an electrooptic modulator (6), field programmable gate array (7), microwave generator (8), No. two electrooptic modulators (9), photoelectric switching circuit (10), No. two fiber couplers (11), Fiber Bragg Grating FBG (12), an optical fiber circulator (13), Erbium-Doped Fiber Amplifier (EDFA) (14), data collecting card (15), fibre optic isolater (17), disturb inclined to one side instrument (17), photodetector (18), No. two optical fiber circulators (19) and sensor fibre (20),
The continuous laser of laser instrument (1) transmitting is divided into two bundle continuous lights through a fiber coupler (2), this two bundles continuous light is incident to respectively a Polarization Controller (3) and No. two Polarization Controllers (4), polarized light after a Polarization Controller (3) is incident to an electrooptic modulator (6), the relevant dipulse sequence light signal of an electrooptic modulator (6) output after field programmable gate array (7) drives, described relevant dipulse sequence light signal is divided into two row coherent pulse sequence light signals after No. two fiber couplers (11), the relevant dipulse sequence light signal of these two row is incident to respectively the light-sensitive surface of Erbium-Doped Fiber Amplifier (EDFA) (14) and photoelectric switching circuit (10), the electric signal obtaining through photoelectric switching circuit (10) conversion inputs to the conditioning signal input end of adjustable D. C regulated (5),
Relevant dipulse sequence light signal after Erbium-Doped Fiber Amplifier (EDFA) (14) amplifies is disturbed No. 1 port that is incident to No. two optical fiber circulators (19) to the rear through disturbing inclined to one side instrument (17), the relevant dipulse sequence light signal of (19) No. 2 port outputs of No. two optical fiber circulators is incident to one end of sensor fibre (20)
The bias voltage adjustment signal output part of adjustable D. C regulated (5) connects the voltage signal input end of an electrooptic modulator (6);
Polarized light after No. two Polarization Controllers (4) is incident to No. two electrooptic modulators (9), the driving signal output part of microwave generator (8) connects the driving signal input of No. two electrooptic modulators (9), light beam after No. two electrooptic modulators (9) modulation is incident to No. 1 port of an optical fiber circulator (13), after No. 2 port outputs of an optical fiber circulator (13), be incident to Fiber Bragg Grating FBG (12), detection light after Fiber Bragg Grating FBG (12) frequency-selective filtering is from No. 3 port outputs of an optical fiber circulator (13), the light beam of exporting from No. 3 ports of an optical fiber circulator (13) is incident to the other end of sensor fibre (20) after fibre optic isolater (17),
In sensor fibre (20), there is stimulated Brillouin scattering effect with the detection light after fibre optic isolater (17) in the relevant dipulse sequence light signal of (17) No. 2 port outputs of No. two optical fiber circulators, the detection light that sensor fibre (20) inscattering goes out is incident to No. 2 ports of No. two optical fiber circulators (17), the light signal of launching through No. 3 ports of No. two optical fiber circulators (17) is incident on the light-sensitive surface of photodetector (18), electric signal after photodetector (18) conversion is sent to the data-signal input end of data collecting card (15), trigger pip output terminal connection data capture card (15) the data acquisition control signal input part of field programmable gate array (7).
2. according to claim 1ly it is characterized in that based on relevant dual-pulse time series technique Brillouin optical time domain analysis instrument, laser instrument (1) adopts tunable laser or distributed feedback type semiconductor laser.
3. according to claim 1ly it is characterized in that based on relevant dual-pulse time series technique Brillouin optical time domain analysis instrument, sensor fibre (20) adopts single-mode fiber or polarization maintaining optical fibre.
4. based on relevant dual-pulse time series technique Brillouin optical time domain analysis instrument, it is characterized in that, this analyser comprises laser instrument (1), a fiber coupler (2), a Polarization Controller (3), No. two Polarization Controllers (4), adjustable D. C regulated (5), an electrooptic modulator (6), field programmable gate array (7), microwave generator (8), No. two electrooptic modulators (9), photoelectric switching circuit (10), No. two fiber couplers (11), Fiber Bragg Grating FBG (12), an optical fiber circulator (13), Erbium-Doped Fiber Amplifier (EDFA) (14), data collecting card (15), fibre optic isolater (17), disturb inclined to one side instrument (17), photodetector (18), No. two optical fiber circulators (19), sensor fibre (20) and function generator (21),
The continuous laser of laser instrument (1) transmitting is divided into two bundle continuous lights through a fiber coupler (20), this two bundles continuous light is incident to respectively a Polarization Controller (3) and No. two Polarization Controllers (4), polarized light after a Polarization Controller (3) modulation is incident to an electrooptic modulator (6), the relevant dipulse sequence light signal of an electrooptic modulator (6) output after function generator (21) drives, described relevant dipulse sequence light signal is divided into the relevant dipulse sequence light signal of two row after No. two fiber couplers (11), the relevant dipulse sequence light signal of these two row is incident to respectively the plane of incidence of Erbium-Doped Fiber Amplifier (EDFA) (14) and the light-sensitive surface of photoelectric switching circuit (10), the electric signal obtaining through photoelectric switching circuit (10) conversion inputs to the conditioning signal input end of adjustable D. C regulated (5),
Relevant dipulse sequence light signal after Erbium-Doped Fiber Amplifier (EDFA) (14) amplifies is disturbed No. 1 port that is incident to No. two optical fiber circulators (19) to the rear through disturbing inclined to one side instrument (17), the relevant dipulse sequence light signal of (19) No. 2 port outputs of No. two optical fiber circulators is incident to one end of sensor fibre (20)
The bias voltage adjustment signal output part of adjustable D. C regulated (5) connects the voltage signal input end of an electrooptic modulator (6);
Polarized light after No. two Polarization Controllers (4) modulation is incident to No. two electrooptic modulators (9), the driving signal output part of microwave generator (8) connects the driving signal input of No. two electrooptic modulators (9), light beam after No. two electrooptic modulators (9) modulation is incident to No. 1 port of an optical fiber circulator (13), after No. 2 port outputs of an optical fiber circulator (13), be incident to Fiber Bragg Grating FBG (12), detection light after Fiber Bragg Grating FBG (12) frequency-selective filtering is from No. 3 port outputs of an optical fiber circulator (13), the light beam of exporting from No. 3 ports of an optical fiber circulator (13) is incident to the other end of sensor fibre (20) after fibre optic isolater (17),
In sensor fibre (20), there is stimulated Brillouin scattering with the detection light after fibre optic isolater (17) in the relevant dipulse sequence light signal of (19) No. 2 port outputs of No. two optical fiber circulators, the light signal scattering is incident to No. 2 ports of No. two optical fiber circulators (19), the light signal of launching through No. 3 ports of No. two optical fiber circulators (19) is incident on the light-sensitive surface of photodetector (18), electric signal after photodetector (18) conversion is sent to the data-signal input end of data collecting card (15), trigger pip output terminal connection data capture card (15) the data acquisition control signal input part of field programmable gate array (7).
5. based on relevant dual-pulse time series technique Brillouin optical time domain analysis instrument, it is characterized in that, this time-domain analysis instrument comprises laser instrument (1), a fiber coupler (2), a Polarization Controller (3), No. two Polarization Controllers (4), adjustable D. C regulated (5), an electrooptic modulator (6), field programmable gate array (7), microwave generator (8), photoelectric switching circuit (10), No. two fiber couplers (11), Erbium-Doped Fiber Amplifier (EDFA) (14), data collecting card (15), fibre optic isolater (17), disturb inclined to one side instrument (17), photodetector (18), No. two optical fiber circulators (19), sensor fibre (20) and single side-band modulator (22),
The two bundle continuous lights of the continuous laser of laser instrument (1) transmitting after a fiber coupler (2) are incident to respectively a Polarization Controller (3) and No. two Polarization Controllers (4), polarized light after a Polarization Controller (3) modulation is incident to an electrooptic modulator (6), an electrooptic modulator (6) is output coherent pulse sequence after field programmable gate array (7) drives, the two row relevant dipulse sequence of relevant dipulse sequence after No. two fiber couplers (11) is incident to respectively the light-sensitive surface of Erbium-Doped Fiber Amplifier (EDFA) (14) and adjustable D. C regulated (5), after amplifying, Erbium-Doped Fiber Amplifier (EDFA) (14) disturbs dry pulse train to the rear and is incident to No. 1 port of No. two optical fiber circulators (19) through disturbing inclined to one side instrument (17), the relevant dipulse sequence of (19) No. 2 port outputs of No. two optical fiber circulators is incident to one end of sensor fibre (20),
The bias voltage adjustment signal output part of adjustable D. C regulated (5) connects the voltage signal input end of an electrooptic modulator (6);
Polarized light after No. two Polarization Controllers (4) modulation is incident to single side-band modulator (22), the driving signal output part of microwave generator (8) connects the driving signal input of single side-band modulator (22), and the light beam after single side-band modulator (22) modulation is incident to the other end of sensor fibre (20) after fibre optic isolater (17);
In sensor fibre (20), there is stimulated Brillouin scattering with the detection light after fibre optic isolater (17) in the relevant dipulse sequence light signal of (19) No. 2 port outputs of No. two optical fiber circulators, the light signal scattering is disturbed No. 2 ports that are incident to No. two optical fiber circulators (17) to the rear through disturbing inclined to one side instrument (19), the light signal of launching through No. 3 ports of No. two optical fiber circulators (17) is incident on the light-sensitive surface of photodetector (18), electric signal after photodetector (18) conversion is sent to the data-signal input end of data collecting card (15), trigger pip output terminal connection data capture card (15) the data acquisition control signal input part of field programmable gate array (7).
6. utilize and suppress the method for common-mode noise based on relevant dual-pulse time series technique Brillouin optical time domain analysis instrument described in claim 1, it is characterized in that the concrete steps of the method:
The power supply transmitting continuous laser beam of step 1, unlatching laser instrument (1), is divided into two bundle continuous lights in the ratio of 1:1 by continuous laser beam through a fiber coupler (2);
Step 2, function generator (21) produce electric impulse signal and drive the relevant dual-pulse sequence light signal of electrooptic modulator (6) output;
In described relevant dual-pulse sequence, the duration of pulse of previous pulse is τ
1, the duration of pulse of a rear pulse is τ
2, the recurrent interval is Δ τ, relevant dual-pulse sequence time is spaced apart τ
coherent; Be less than pulse to sequence interference time τ with the interval delta τ of set of pulses centering two pulses
coherent, i.e. Δ τ < τ
coherent;
Step 3, relevant dual-pulse sequence light signal are disturbed partially through disturbing inclined to one side instrument (17) after Erbium-Doped Fiber Amplifier (EDFA) (14) amplifies, and will disturb relevant dual-pulse sequence to the rear and be incident to No. 1 port of No. two optical fiber circulators (19), be emitted to one end of sensor fibre (20) through No. 2 ports of No. two optical fiber circulators (19);
Relevant dual-pulse sequence light signal is sent to the conditioning signal input end of adjustable D. C regulated (5) after changing by photoelectric switching circuit (10) simultaneously, and adjustable D. C regulated (5) regulates the voltage of an electrooptic modulator (6);
Step 4, the microwave signal of utilizing microwave generator (8) to produce, and microwave signal is loaded with the continuous light of No. two electrooptic modulators (9) reception and superposeed, and the continuous light after stack is emitted to No. 1 port of an optical fiber circulator (13);
The microwave signal of utilizing microwave generator (8) to produce, and the continuous light of microwave signal and No. two electrooptic modulators (9) reception is superposeed: the side frequency deviation that continuous light produces by No. two electrooptic modulators (9) is Brillouin shift ν
b, the continuous light frequency of acquisition is ν
0± ν
band ν
0, wherein ν
0for the frequency of laser instrument 1;
Step 5, be incident to an optical fiber circulator (13) light beam through Fiber Bragg Grating FBG (12) filtering lower side frequency, obtain continuous upper side frequency light, upper side frequency light is emitted to the other end of sensor fibre (20) after fibre optic isolater (17) continuously;
Step 6, continuous upper side frequency light and disturb relevant dual-pulse sequence light signal to the rear stimulated Brillouin scattering effect occurs in sensor fibre (20);
Step 7, detection light after stimulated Brillouin scattering effect are incident on the light-sensitive surface of photodetector (18) after No. two optical fiber circulators (17), photodetector (18) is converted to electric signal by the light signal receiving and is sent to data collecting card (15), obtains brillouin scattering signal;
Step 8, adopt differential data disposal route to remove pulse in the brillouin scattering signal that step 7 obtains, to corresponding two total common-mode noises of back scattering Brillouin signal, to realize the inhibition to common-mode noise.
7. utilize and suppress the method for common-mode noise based on relevant dual-pulse time series technique Brillouin optical time domain analysis instrument described in claim 4, it is characterized in that, the concrete steps of the method are:
The power supply transmitting continuous laser beam of step 1, unlatching laser instrument (1), is divided into two bundle continuous lights in the ratio of 1:1 by continuous laser beam through a fiber coupler (2);
Step 2, function generator (21) produce electric impulse signal and drive the relevant dual-pulse sequence light signal of electrooptic modulator (6) output;
The duration of pulse that described relevant dipulse sequence is previous pulse in sequence is τ
1, the duration of pulse of a rear pulse is τ
2, the recurrent interval is Δ τ, relevant dual-pulse sequence time is spaced apart τ
coherent; Be less than pulse to sequence interference time τ with the interval delta τ of set of pulses centering two pulses
coherent, i.e. Δ τ < τ
coherent;
Step 3, relevant dual-pulse sequence light signal are disturbed partially through disturbing inclined to one side instrument (17) after Erbium-Doped Fiber Amplifier (EDFA) (14) amplifies, and will disturb relevant dual-pulse sequence light signal to the rear and be incident to No. 1 port of No. two optical fiber circulators (19), be emitted to one end of sensor fibre (20) through (19) No. 2 ports of No. two optical fiber circulators;
Relevant dual-pulse sequence light signal is filled and is changed the conditioning signal input end that is sent to adjustable D. C regulated (5) after circuit (10) is changed by photoelectricity simultaneously, and adjustable D. C regulated (5) regulates the voltage of an electrooptic modulator (6);
Step 4, the microwave signal of utilizing microwave generator (8) to produce, and microwave signal is loaded with the continuous light of No. two electrooptic modulators (9) reception and superposeed, and the continuous light after stack is emitted to No. 1 port of an optical fiber circulator (13);
The microwave signal of utilizing microwave generator (8) to produce, and the continuous light of microwave signal and No. two electrooptic modulators (9) reception is superposeed: the side frequency deviation that continuous light produces by No. two electrooptic modulators (9) is Brillouin shift ν
b, the continuous light frequency of acquisition is ν
0± ν
band ν
0, wherein ν
0for the frequency of laser instrument (1);
Step 5, be incident to an optical fiber circulator (13) light beam through Fiber Bragg Grating FBG (12) filtering lower side frequency, obtain continuous upper side frequency light, upper side frequency light is emitted to the other end of sensor fibre (20) after fibre optic isolater (17) continuously;
Step 6, continuous upper side frequency light and disturb relevant dual-pulse sequence light signal to the rear stimulated Brillouin scattering occurs in sensor fibre (20);
Light signal after step 7, Brillouin scattering is incident on the light-sensitive surface of photodetector (18) after No. two optical fiber circulators (17), electric explorer (18) is converted to electric signal by the light signal receiving and is sent to data collecting card (15), obtains brillouin scattering signal;
Step 8, adopt differential data disposal route to remove pulse in the brillouin scattering signal that step 7 obtains, to corresponding two total common-mode noises of back scattering Brillouin signal, to realize the inhibition to common-mode noise.
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