CN104677396B - Dynamic distributed Brillouin optical fiber sensing device and method - Google Patents
Dynamic distributed Brillouin optical fiber sensing device and method Download PDFInfo
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- CN104677396B CN104677396B CN201510122412.7A CN201510122412A CN104677396B CN 104677396 B CN104677396 B CN 104677396B CN 201510122412 A CN201510122412 A CN 201510122412A CN 104677396 B CN104677396 B CN 104677396B
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Abstract
The invention discloses a dynamic distributed Brillouin optical fiber sensing device and method. The dynamic distributed Brillouin optical fiber sensing device comprises a narrow linewidth laser, a polarization-maintaining coupler, a coupler, a first electro-optic intensity modulator, a pulse signal generator, a frequency shifter, an optical amplifier, a polarization scrambler, an optical circulator, a polarization controller, a second electro-optic intensity modulator, a microwave signal source, a sensing optical fiber, a 3dB coupler, a balanced photoelectric detector and a data acquisition and processing module. Two technologies including a Brillouin gain spectrum dual-slope frequency point assisted method and a coherent detection technology are adopted at the same time. The coherent detection technology can increase the signal-noise ratio of a system, improve the measurement precision and increases the sensing distance; the Brillouin gain spectrum dual-slope frequency point assisted method solves a problem of influence of optical power fluctuation of a pumping pulse on the measurement precision in a conventional Brillouin gain spectrum slope frequency point assisted method. Therefore, the dynamic distributed Brillouin optical fiber sensing device and method can realize dynamic event measurement with relatively high measurement precision while guaranteeing that the Brillouin optical fiber sensing system has relatively long sensing distance.
Description
Technical field
The present invention relates to technical field of optical fiber sensing, and in particular to a kind of dynamic distributed Brillouin light fiber sensing equipment and
Method.
Background technology
Optical fiber Brillouin optical time-domain analysis technology (BOTDA) is a kind of distributed light based on stimulated Brillouin scattering effect
Fine sensing technology, by the way that a branch of pump light (pulsed light) and a branch of detection light (continuous light) are injected separately into into optical fiber two ends, when two
The difference on the frequency of Shu Guang in brillouin gain scope, between two-beam due to stimulated Brillouin effect occur energy transfer；To visiting
Light-metering pointwise frequency sweep, can show that sensor fibre brillouin gain spectrum along the line (BGS) is distributed, it is hereby achieved that Brillouin shift
(BFS) along the distribution of sensor fibre, using frequency shift amount and temperature/strain is proportional and optical time domain reflection technology, can be real
Existing temperature and the distributed measurement of strain.
BOTDA technologies have detectable signal stronger, distance sensing length, the characteristics of certainty of measurement is high, in Large Infrastructure Projects
Have a wide range of applications in monitoring structural health conditions.But because its measurement process generally requires to scan hundreds of megahertz of Brillouin
Gain spectral is obtaining Brillouin shift, and time of measuring is longer, therefore can not be applied to dynamic event such as dynamic strain, vibration
Deng measurement.The BOTDA technologies that can be used for Dynamic Signal measurement existing at present, have frequency comb to exempt from frequency sweep method, modulation detection light
Frequency method or variable ratio frequency changer visit photometry and brillouin gain Slope Method, and in these methods, brillouin gain Slope Method is the simplest
Preferably, additive method needs complicated frequency modulation(PFM) and data processing, but brillouin gain Slope Method is removed for list and the impact of performance
Measurement range is limited outer also to have one serious, shadow that the certainty of measurement of system is seriously fluctuated by pumping light power
Ring.
The content of the invention
To be solved by this invention is that certainty of measurement seriously receives pump in brillouin gain Slope Method BOTDA dynamic sensitive technologies
A kind of problem that Pu optical power fluctuation affects, there is provided dynamic based on coherent detection and BGS diclinic rate frequency householder methods point
Cloth Brillouin light fiber sensing equipment and method, can have the same of longer distance sensing Brillouin light fiber sensor system is ensured
When, moreover it is possible to realize being measured compared with the dynamic event of high measurement accuracy.
To solve the above problems, the present invention is achieved by the following technical solutions：
A kind of dynamic distributed Brillouin light fiber sensing equipment, including narrow linewidth laser, polarization-maintaining coupler, coupler,
First electro-optic intensity modulator, pulse signal generator, frequency shifter, image intensifer, scrambler, optical circulator, Polarization Controller,
Second photoelectricity intensity modulator, microwave signal source, sensor fibre, three-dB coupler, balance photodetector and data acquisition process
Module.The output end of narrow linewidth laser connects the input of polarization-maintaining coupler, and the two-way output end of polarization-maintaining coupler connects respectively
Connect the input of the first electro-optic intensity modulator and the input of coupler.It is strong that pulse signal generator is directly connected to the first electric light
The radio frequency interface of degree modulator, the output end of the first electro-optic intensity modulator connects the input of image intensifer；Image intensifer
Output end connects the input of scrambler；The output end of scrambler is connected with the A ports of optical circulator.The two-way of coupler is defeated
Go out end and connect the input of frequency shifter and an input of three-dB coupler respectively；The output end connection Polarization Control of frequency shifter
The input of device, the output end of Polarization Controller connects the input of the second photoelectricity intensity modulator, and microwave signal source directly connects
Connect the radio frequency interface of the second electro-optic intensity modulator；The output end of the second electro-optic intensity modulator connects one end of sensor fibre；
The other end of sensor fibre connects the B ports of optical circulator；Another input of three-dB coupler connects the C-terminal of optical circulator
Mouthful.The output end Jing balance photodetector of three-dB coupler is connected with digital sampling and processing.
In such scheme, the pumping pulse optical width of the output of the first electro-optic intensity modulator is 10ns-50ns.
In such scheme, shift frequency amount f of frequency shifterm=Δ vB/ 2, wherein Δ vBFor half Gao Quan of excited Brillouin gain spectral
It is wide.
In such scheme, the frequency of the microwave telecommunication number of microwave signal source outputDynamic strain is not received equal to sensor fibre
When Brillouin shift.
In such scheme, the sensor fibre is general single mode fiber.
In such scheme, the detective bandwidth of the balance photodetector is 12GHz.
A kind of dynamic distributed Brillouin fiber optic method for sensing, comprises the steps：
Narrow linewidth laser sends frequency for f0Continuous light the continuous light of two-way is divided into by polarization-maintaining coupler, i.e., the first via connects
The continuous light of continuous light and the second road；Wherein
The continuous light of the first via is modulated into pumping pulse light by the first electro-optic intensity modulator, and the frequency of pumping pulse light is
f0, the pulse width size of the pumping pulse light of the first electro-optic intensity modulator modulation is by pulse signal generator control, modulation
Good pumping pulse light is exported to scrambler, the pumping arteries and veins of scrambler output after image intensifer is amplified to prospective peak value power
Wash off and optical circulator, and the one end exported by the B ports of optical circulator to sensor fibre are entered by the A ports of optical circulator；
The continuous light Jing couplers in second road are divided into the continuous light of two-way, that is, detect light and local oscillator light, now detect light and local oscillator
The frequency of light is all f0；Detection light Jing frequency shifters carry out shift frequency fmExport afterwards to the input of Polarization Controller, by Polarization Controller
Carry out being exported to the second electro-optic intensity modulator for being operated in suppression carrier-frequency mode, the second electro-optic intensity after polarization state control
Modulator is modulated into upper side band detection light and lower sideband detection light, the upper side band detection of the second electro-optic intensity modulator output
Light and lower sideband detection light all inject the other end of sensor fibre；
The pumping pulse light of the B ports output of optical circulator and the upper side band detection light of the second electro-optic intensity modulator injection
Light is detected when sensor fibre meets, produce stimulated Brillouin scattering and interact with lower sideband；The process of sensor fibre output
The local oscillator light that the upper side band detection light and lower sideband detection light that excited Brillouin interacts is exported with coupler, Jing 3dB couplings
After device coupling, then coherent detection is carried out by balance photodetector；The intermediate frequency electric signal of balance photodetector output is by data
Acquisition processing module is acquired and processes, respectively obtain through excited Brillouin interact after upper side band detection light and under
Sideband detects power distribution and their ratio of the light along sensor fibre, further according to the upper side band detection light and lower sideband that are obtained
Detection light is along the power ratio of sensor fibre and relation R (t, z, the δ v of residing sensor fibre position Brillouin shiftB) can obtain
To the Brillouin shift variable quantity δ v of present positionB(t, z), finally according to Brillouin shift variable quantity δ vB(t, z) and strain
Linear relationship realizes dynamic distributed strain sensing.
Said method, still further comprises, and sensor fibre is obtained ahead of time not by dynamic by the frequency sweeping method of traditional BOTDA
Brillouin shift during strainThe step of.
In said method, the upper side band of the second electro-optic intensity modulator output detects frequency v of light+For：
The lower sideband of the second electro-optic intensity modulator output detects frequency v of light-For：
In formula, f0The frequency of the pumping pulse light modulated for the first electro-optic intensity modulator,It is defeated for microwave signal source
Go out the modulating frequency of the microwave signal to the second electro-optic intensity modulator, its numerical value be equal to sensor fibre do not receive dynamic strain when
Brillouin shift, Δ vBFor the full width at half maximum of excited Brillouin gain spectral.
In said method, the upper side band detection light and lower sideband interacted through excited Brillouin detects light along sense light
The power distribution of fibre and relation R (t, z, the δ v of the Brillouin shift variable quantity of residing sensor fibre positionB) be：
In formula, POn(t, z) is that the upper side band detection light interacted through excited Brillouin divides along the power of sensor fibre
Cloth, PUnder(t, z) is that the lower sideband interacted through excited Brillouin detects power distribution of the light along sensor fibre, and z is residing
The position of sensor fibre, G (v) represents normalized brillouin gain, v+For the frequency that upper side band detects light, v-For lower sideband spy
The frequency of light-metering；f0The frequency of the pumping pulse light modulated for the first electro-optic intensity modulator, Δ vBFor excited Brillouin gain
The full width at half maximum of spectrum, Export to the microwave of the second electro-optic intensity modulator for microwave signal source
The modulating frequency of signal, δ vB(t, z) is the Brillouin shift variable quantity of residing sensor fibre position.
Compared with prior art, the present invention is based on the dynamic distributed of coherent detection and BGS diclinic rate frequency householder methods
Brillouin light fiber sensing equipment and method, it employs brillouin gain spectrum diclinic rate frequency auxiliary law and coherent detection two simultaneously
The technology of kind.Coherent detection technology can improve signal to noise ratio, certainty of measurement and the increase distance sensing of system；Brillouin gain spectrum is double
It is smart to measurement that slope frequency auxiliary law overcomes pumping pulse optical power fluctuation in traditional brillouin gain slope frequency auxiliary law
The problem that degree affects.Therefore the present invention can be while ensureing that Brillouin light fiber sensor system has longer distance sensing, also
Can realize being measured compared with the dynamic event of high measurement accuracy.
Description of the drawings
Fig. 1 is the schematic diagram of dynamic distributed Brillouin light fiber sensing equipment.
Fig. 2 is the frequency relation of pumping pulse light, detection light and local oscillator light.
Fig. 3 is the intermediate-freuqncy signal schematic diagram of brillouin gain spectrum diclinic rate frequency auxiliary law output.
Fig. 4 is the intermediate-freuqncy signal schematic diagram exported after institute's probing light-metering coherent detection.
Specific embodiment
A kind of dynamic distributed Brillouin light fiber sensing equipment, as shown in figure 1, it includes narrow linewidth laser 01, protects inclined
Coupler 02, coupler 03, the first electro-optic intensity modulator 04, pulse signal generator 05, frequency shifter 06, image intensifer 07,
Scrambler 08, optical circulator 09, Polarization Controller 10, the second photoelectricity intensity modulator 11, microwave signal source 12, sensor fibre
13rd, three-dB coupler 14, balance photodetector 15 and digital sampling and processing 16.
The output end of narrow linewidth laser 01 connects the input of polarization-maintaining coupler 02, the two-way output of polarization-maintaining coupler 02
End connects respectively the input of the first electro-optic intensity modulator 04 and the input of coupler 03；
Pulse signal generator 05 is directly connected to the radio frequency interface of the first electro-optic intensity modulator 04, and the first electro-optic intensity is adjusted
The light path of device processed 04 is exported as pumping pulse light, and the width of pumping pulse light is controlled by pulse signal generator 05, and first is electric
The output end of light intensity modulator 04 connects the input of image intensifer 07；The output end connection scrambler 08 of image intensifer 07
Input；The output end of scrambler 08 is connected with the A ports of optical circulator 09；
The two-way output end of coupler 03 connects respectively an input of three-dB coupler 14 and the input of frequency shifter 06
End, wherein the light all the way being connected with 14 1 inputs of three-dB coupler is used as local oscillator light, it is another with the input of frequency shifter 06
Road light is used as detection light；The output end of frequency shifter 06 connects the input of Polarization Controller 10, the output end of Polarization Controller 10
Connect the second photoelectricity intensity modulator 11, microwave signal source 12 is directly connected to the radio frequency interface of the second electro-optic intensity modulator 11；
The output end of the second electro-optic intensity modulator 11 connects one end of sensor fibre 13；The other end connection light annular of sensor fibre 13
The B ports of device 09；Another input of three-dB coupler 14 connects the C-terminal mouth of optical circulator 09；
In sensor fibre 13, detection light and pumping pulse light interact because of stimulated Brillouin scattering；Jing phases
The detection light of interaction enters the B ports of optical circulator 09, and exports to three-dB coupler 14 from the C-terminal mouth of optical circulator 09,
The output end of three-dB coupler 14 is connected Jing after balance photodetector 15 carries out coherent detection with digital sampling and processing 16,
Digital sampling and processing 16 obtains double-side band detection light and 2 intermediate-freuqncy signals after local oscillator optical coherent detection simultaneously.
In the present invention, the pumping pulse optical width of the output of first electro-optic intensity modulator 04 is 10ns-50ns,
The pumping pulse optical width exported in the present embodiment is 30ns.The pulse signal generator 05 is produced using Agilent company
, model 8110A pulse signal generator, pulse signal generator output pulse width for 30ns electric impulse signal, this
Sensing device can be allowed to realize the spatial resolution of 3m.Shift frequency amount f of the frequency shifter 06mFor 20-80MHz, preferably, this
Embodiment is using the acousto-optic modulator of frequency upper shift 30MHz as frequency shifter.The image intensifer 07 is erbium-doped fiber amplifier,
And the phase peak power of pumping pulse light is amplified to into about 23dBm.The frequency of the microwave telecommunication number of the output of the microwave signal source 12
RateBrillouin shift during dynamic strain is not received equal to sensor fibre.The sensor fibre 13 is general single mode fiber.It is described
The detective bandwidth of balance photodetector 15 is 12GHz.The digital sampling and processing 16 is operated in external trigger pattern and energy
Upper and lower sideband detection light and two intermediate-freuqncy signals after local oscillator optical coherent detection are obtained simultaneously, and trigger is by pulse signal
Generator 05 is provided.
The dynamic distributed Brillouin fiber optic sensing designed based on above-mentioned dynamic distributed Brillouin light fiber sensing equipment
Method, comprises the following steps：
The narrow linewidth laser 01 sends frequency for f0Continuous light the continuous light of two-way is divided into by polarization-maintaining coupler 02, i.e.,
The continuous light of the continuous light of the first via and the second road；Wherein
The continuous light of the first via is modulated into pumping pulse light by the first electro-optic intensity modulator 04, and the frequency of pumping pulse light is
f0, the pulse width size of pumping pulse light of the modulation of the first electro-optic intensity modulator 04 controls by pulse signal generator 05,
Preferably, pumping pulse optical width is 10ns-50ns, the pumping pulse light for modulating is amplified to expection through image intensifer 07
Export after peak power to the input of scrambler 08, the pumping pulse light from the output of the output end of scrambler 08 is by optical circulator 09
A ports enter and optical circulator 09 and exported to one end of sensor fibre by the B ports of optical circulator 09；
The continuous light Jing couplers 03 in second road are divided into the continuous light of two-way, that is, detect light and local oscillator light, now detect light and sheet
Shake light frequency all be f0；Detection light Jing frequency shifters 06 carry out shift frequency fmExport afterwards to the input of Polarization Controller 10, by polarizing
Controller 10 carries out exporting after polarization state control to the second electro-optic intensity modulator 11 for being operated in suppression carrier-frequency mode, the
Two electro-optic intensity modulators 11 are modulated into frequency and are respectivelyWith's
Upper side band detects light and lower sideband detection light, whereinExport to the micro- of the second electro-optic intensity modulator 11 for microwave signal source 12
The modulating frequency of ripple signal, Brillouin shift during dynamic strain, Δ v are not received equal to sensor fibre 13BFor excited Brillouin increasing
The full width at half maximum of benefit spectrum；The upper side band detection light and lower sideband detection light of the output of the second electro-optic intensity modulator 11 all injects sensing
The other end of optical fiber 13；
The pumping pulse light of the B ports output of optical circulator 09 and the upper side band of the injection of the second electro-optic intensity modulator 11 are visited
Light-metering and lower sideband detect light when sensor fibre 13 meets, and detection light and the pumping pulse light are produced when sensor fibre meets
Raw stimulated Brillouin scattering interacts, sensor fibre 13 export the upper side band detection light that interacts through excited Brillouin and
Lower sideband detection light carries out coherent detection Jing after three-dB coupler 14 is coupled with described local oscillator light by balance photodetector 15,
The intermediate frequency electric signal of the balance output of photodetector 15 is acquired and is processed by digital sampling and processing 16, is obtained through receiving
Upper side band detection light that sharp Brillouin interacts and lower sideband detection light along sensor fibre 13 power distribution and its they
Ratio, further according to the upper side band power ratio and residing fiber position of light and lower sideband detection light along sensor fibre 13 is detected
The relation of Brillouin shift can obtain the Brillouin shift variable quantity δ v of present positionB(t, z), finally according to Brillouin shift
Variable quantity δ vB(t, z) realizes dynamic distributed strain sensing with the linear relationship of strain.
In said method, need that sensor fibre 13 is obtained ahead of time by dynamic strain by the frequency sweeping method of tradition BOTDA
When Brillouin shiftThe microwave signal modulating frequency of the output of the microwave signal source 12 is equal to sensor fibre 13 not by dynamic
Brillouin shift during strainThe pumping pulse optical width is 10ns-50ns, the pumping pulse light exported in the present embodiment
Width is 30ns.The shift frequency amount of the frequency shifter 06 is fm=Δ vB/ 2, wherein Δ vBFor half Gao Quan of excited Brillouin gain spectral
Width, Δ v in the present embodimentBFor 60MHz, the frequency shifter 06 is the acousto-optic modulator of frequency upper shift 30MHz.The upper side band is visited
Difference on the frequency between light-metering and lower sideband detection light and pumping pulse light is steady state value, respectivelyWithTherefore balance photodetector 15 carries out the frequency of the intermediate frequency electric signal exported after coherent detection and is respectivelyWithThe time-domain power of exactly the two intermediate-freuqncy signals that digital sampling and processing 16 is extracted
Curve.Power of the upper side band detection light and lower sideband detection light after excited Brillouin interacts along sensor fibre
Respectively：
POn(t, z)=K × P (z) × G ([v+-f0-vB(t,z)]/ΔvB)
PUnder(t, z)=K × P (z) × G ([v--f0-vB(t,z)]/ΔvB)
Wherein, z is residing sensor fibre position, and K is constant, and P (z) is pumping pulse luminous power, and G (v) represents normalization
Brillouin gain, Δ vBFor the full width at half maximum of excited Brillouin gain spectral,δvB(t, z) is sensing
The Brillouin shift variable quantity produced when optical fiber is by dynamic strain, v+And v-Respectively upper side band detection light and lower sideband detect light
Frequency, and have：
With
The upper side band detection light interacted through excited Brillouin and lower sideband detect work(of the light along sensor fibre
Rate ratio and residing fiber position Brillouin shift variable quantity δ vBThe relation of (t, z) is：
Obviously described upper side band detection light and lower sideband detection light are Brillouin shifts along the power ratio of sensor fibre
Variable quantity δ vBThe function of (t, z) and position z and time t, it is unrelated with pumping pulse power, therefore pumping arteries and veins can be greatly reduced
Wash impact of the power swing to certainty of measurement off.
Fig. 2 is the frequency relation of pumping pulse light, detection light and local oscillator light.Fig. 3 is brillouin gain spectrum diclinic rate frequency
The intermediate-freuqncy signal and brillouin gain spectrum frequency distribution schematic diagram of auxiliary law output.Fig. 4 is defeated after institute's probing light-metering coherent detection
The IF signal frequency schematic diagram for going out.
Above-described embodiment is merely to illustrate the present invention, but it is not for limiting the present invention, the developer of this area
Embodiments of the invention can be carried out it is various change and modification without departing from the spirit and scope of the present invention.
Claims (8)
1. dynamic distributed Brillouin fiber optic method for sensing, it is characterised in that comprise the steps：
Narrow linewidth laser (01) sends frequency for f0Continuous light the continuous light of two-way is divided into by polarization-maintaining coupler (02), i.e., first
The continuous light of the continuous light in road and the second road；Wherein
The continuous light of the first via is modulated into pumping pulse light by the first electro-optic intensity modulator (04), and the frequency of pumping pulse light is f0,
The pulse width size of the pumping pulse light of the first electro-optic intensity modulator (04) modulation is controlled by pulse signal generator (05),
The pumping pulse light for modulating is exported to scrambler (08), scrambler after image intensifer (07) is amplified to prospective peak value power
(08) the pumping pulse light of output enters optical circulator (09) by the A ports of optical circulator (09), and by the B of optical circulator (09)
The one end of port output to sensor fibre (13)；
The continuous light Jing couplers (03) in second road are divided into the continuous light of two-way, that is, detect light and local oscillator light, now detect light and local oscillator
The frequency of light is all f0；Detection light Jing frequency shifters (06) carries out shift frequency fmExport afterwards to the input of Polarization Controller (10), by inclined
The controller (10) that shakes carries out being exported to the second electro-optic intensity modulator for being operated in suppression carrier-frequency mode after polarization state control
(11), the second electro-optic intensity modulator (11) is modulated into upper side band detection light and lower sideband detection light, the second electro-optic intensity
The upper side band detection light and lower sideband detection light of modulator (11) output all inject the other end of sensor fibre (13)；
The pumping pulse light of the B ports output of optical circulator (09) and the upper side band of the second electro-optic intensity modulator (11) injection are visited
Light-metering and lower sideband detect light when sensor fibre (13) meets, and produce stimulated Brillouin scattering and interact；Sensor fibre
(13) the upper side band detection light interacted through excited Brillouin and lower sideband detection light of output is exported with coupler (03)
Local oscillator light, Jing after three-dB coupler (14) coupling, then coherent detection is carried out by balance photodetector (15)；Balance light electrical resistivity survey
The intermediate frequency electric signal for surveying device (15) output is acquired and is processed by digital sampling and processing (16), is respectively obtained through being excited
Brillouin interact after upper side band detection light and lower sideband detection light along sensor fibre (13) power distribution and they
Ratio, further according to the upper side band detection light and lower sideband for being obtained power ratio and residing biography of the light along sensor fibre (13) is detected
Relation R (t, z, the δ v of photosensitive fibre (13) position Brillouin shiftB) the Brillouin shift variable quantity δ v of present position can be obtainedB
(t, z), finally according to Brillouin shift variable quantity δ vB(t, z) realizes dynamic distributed strain sensing with the linear relationship of strain；
The upper side band detection light and lower sideband detection light for wherein interacting through excited Brillouin divides along the power of sensor fibre
Relation R (t, z, the δ v of cloth and the Brillouin shift variable quantity of residing sensor fibre (13) positionB) be：
In formula, POn(t, z) is that the upper side band detection light interacted through excited Brillouin divides along the power of sensor fibre (13)
Cloth, PUnder(t, z) is that the lower sideband interacted through excited Brillouin detects power distribution of the light along sensor fibre (13), and z is
The position of residing sensor fibre (13), G (v) represents normalized brillouin gain, v+For the frequency that upper side band detects light, v-For
Lower sideband detects the frequency of light；f0The frequency of the pumping pulse light modulated for the first electro-optic intensity modulator (04), Δ vBBe by
The full width at half maximum of sharp brillouin gain spectrum, Export to the second electric light for microwave signal source (12)
The modulating frequency of the microwave signal of intensity modulator (11), δ vB(t, z) is the Brillouin shift of residing sensor fibre (13) position
Variable quantity.
2. dynamic distributed Brillouin fiber optic method for sensing according to claim 1, it is characterised in that：Also further wrap
Include, sensor fibre (13) is obtained ahead of time by Brillouin shift during dynamic strain by the frequency sweeping method of traditional BOTDA's
Step.
3. dynamic distributed Brillouin fiber optic method for sensing according to claim 1 and 2, it is characterised in that：
The upper side band of the second electro-optic intensity modulator (11) output detects frequency v of light+For：
The lower sideband of the second electro-optic intensity modulator (11) output detects frequency v of light-For：
In formula, f0The frequency of the pumping pulse light modulated for the first electro-optic intensity modulator (04),For microwave signal source (12)
The modulating frequency of the microwave signal to the second electro-optic intensity modulator (11) is exported, its numerical value is equal to sensor fibre (13) not by dynamic
Brillouin shift when state is strained, Δ vBFor the full width at half maximum of excited Brillouin gain spectral.
4. the dynamic distributed Brillouin light fiber sensing equipment of claim 1 methods described is realized, it is characterised in that：Including narrow line
Wide laser instrument (01), polarization-maintaining coupler (02), coupler (03), the first electro-optic intensity modulator (04), pulse signal generator
(05), frequency shifter (06), image intensifer (07), scrambler (08), optical circulator (09), Polarization Controller (10), the second photoelectricity
Intensity modulator (11), microwave signal source (12), sensor fibre (13), three-dB coupler (14), balance photodetector (15) and
Digital sampling and processing (16)；Shift frequency amount f of above-mentioned frequency shifter (06)m=△ vB/ 2, wherein Δ vBFor excited Brillouin gain
The full width at half maximum of spectrum；
The input of output end connection polarization-maintaining coupler (02) of narrow linewidth laser (01), the two-way of polarization-maintaining coupler (02) is defeated
Go out end and connect the input of the first electro-optic intensity modulator (04) and the input of coupler (03) respectively；
Pulse signal generator (05) is directly connected to the radio frequency interface of the first electro-optic intensity modulator (04), and the first electro-optic intensity is adjusted
The input of output end connection image intensifer (07) of device (04) processed；Output end connection scrambler (08) of image intensifer (07)
Input；The output end of scrambler (08) is connected with the A ports of optical circulator (09)；
The two-way output end of coupler (03) connects respectively an input of the input of frequency shifter (06) and three-dB coupler (14)
End；The input of output end connection Polarization Controller (10) of frequency shifter (06), the output end connection the of Polarization Controller (10)
The input of two photoelectricity intensity modulators (11), microwave signal source (12) is directly connected to penetrating for the second electro-optic intensity modulator (11)
Frequency interface；One end of output end connection sensor fibre (13) of the second electro-optic intensity modulator (11)；Sensor fibre (13) it is another
The B ports of one end connection optical circulator (09)；The C-terminal of another input connection optical circulator (09) of three-dB coupler (14)
Mouthful；
Output end Jing balance photodetector (15) of three-dB coupler (14) is connected with digital sampling and processing (16).
5. dynamic distributed Brillouin light fiber sensing equipment according to claim 4, it is characterised in that：First electro-optic intensity
The pumping pulse optical width of the output of modulator (04) is 10ns-50ns.
6. dynamic distributed Brillouin light fiber sensing equipment according to claim 4, it is characterised in that：Microwave signal source
(12) frequency of the microwave telecommunication number of outputBrillouin shift during dynamic strain is not received equal to sensor fibre (13).
7. dynamic distributed Brillouin light fiber sensing equipment according to claim 4, it is characterised in that：The sensor fibre
(13) it is general single mode fiber.
8. dynamic distributed Brillouin light fiber sensing equipment according to claim 4, it is characterised in that：The balance photoelectricity
The detective bandwidth of detector (15) is 12GHz.
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| US7480460B2 (en) * | 2005-03-29 | 2009-01-20 | University Of New Brunswick | Dynamic strain distributed fiber optic sensor |
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| CN103335666B (en) * | 2013-06-13 | 2015-09-16 | 哈尔滨工业大学 | Dynamic distributed Brillouin light fiber sensing equipment and method |
| CN103913185B (en) * | 2014-03-31 | 2016-05-25 | 广西师范大学 | Brillouin light fiber sensor system and method |
| CN204439100U (en) * | 2015-03-19 | 2015-07-01 | 广西师范大学 | Dynamic distributed Brillouin light fiber sensing equipment |
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| CN106123933A (en) * | 2016-07-18 | 2016-11-16 | 太原理工大学 | A kind of chaos fiber optic loop declines and swings sensing device and method |
| CN106123933B (en) * | 2016-07-18 | 2018-01-09 | 太原理工大学 | A kind of chaos fiber optic loop, which declines, swings sensing device and method |
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