CN105784190A - Stimulated Brillouin effect-based differential temperature sensor - Google Patents
Stimulated Brillouin effect-based differential temperature sensor Download PDFInfo
- Publication number
- CN105784190A CN105784190A CN201410815888.4A CN201410815888A CN105784190A CN 105784190 A CN105784190 A CN 105784190A CN 201410815888 A CN201410815888 A CN 201410815888A CN 105784190 A CN105784190 A CN 105784190A
- Authority
- CN
- China
- Prior art keywords
- light
- signal
- modulation
- temperature sensor
- stokes
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Abstract
The present invention provides a stimulated Brillouin effect-based differential temperature sensor. The continuous light generated by a light generating unit is subjected to a first modulation amplifier unit to obtain a signal containing the Stokes light and the anti-Stokes light. After that, the signal is subjected to a second modulation amplifier unit to generate a phase modulated signal. The modulated signal is subjected to a filter, so that the Stokes light and the anti-Stokes light are filtered out. The Stokes light passes through a delay optical fiber to be integrated with the anti-Stokes light as one path of optical signals through a 3 dB coupler. The path of optical signals is subjected to a polarizer, so that the polarized light can be extracted. The extracted polarized light is subjected to a third modulation amplifier unit to obtain the pumped pulse light. The pumped pulse light is injected into the initial end of a sensing optical fiber. The detection light of the other path is infiltrated through the tail end of the sensing optical fiber via a scrambler instrument and an isolator. Inside the optical fiber, the detection light forms a circulator together with the pumped pulse light under the stimulated Brillouin effect, and then is converted into an electric signal through a photoelectric detector. According to the technical scheme of the invention, the temperature resolution and the sensing distance are higher on the premise that the high spatial resolution is realized.
Description
Technical field
The present invention relates to temperature or strain gauge technical field, particularly relate to a kind of differential type temperature sensor based on stimulated Brillouin effect.
Background technology
Based on the distributed fiber optic temperature of stimulated Brillouin effect, stress sensing system with light wave for transducing signal, with optical fiber for transmission medium, perception and the extraneous dut temperature of detection or stress signal, it not only has an advantage of general Fibre Optical Sensor, and can obtain simultaneously temperature or stress in time with the continuous distribution information in space.Owing to optical fiber itself is not charged, volume is little, light weight, flexible, electromagnetism interference, radiation resistance are good, particularly can be adapted under the adverse circumstances such as inflammable, explosive and strong electromagnetic and use, make it at following intelligent grid, Oilfield Pipelines security monitoring, the key areas such as communication line attack early warning has a wide range of applications demand.
At present, Brillouin light domain reflectometer (BOTDR), Brillouin optical time domain analysis (BOTDA), Brillouin light frequency-domain analysis (BOFDA) are specifically included that based on the sensor-based system of stimulated Brillouin effect.Wherein, BOTDA is high with its certainty of measurement, and relatively short response time and paid close attention to widely and studied.Its ultimate principle can be summarized as: has the pumping pulse light of fixed frequency difference and the continuous probe light of reverse transfer to cause optical fibre refractivity to rise and fall with space periodicity in time in the place that optical fiber meets by electrostriction effect, thus producing to be excited acoustic wavefield, under the effect of this acoustic wavefield, there is the transfer of energy between pump light and detection light, form stimulated Brillouin scattering.Obtaining continuous light Lorentz lorentz's type gain spectral under different frequency difference by constantly frequency sweep, this gain spectral obtains maximum at Brillouin shift place, and experiment finds that Brillouin shift has extremely strong linear dependence with temperature or stress.Therefore, as long as detecting that in optical fiber, the change of Brillouin shift can be obtained by the distribution on optical fiber of temperature or stress.Realizing this system needs the key technical indexes solved to include: spatial resolution, temperature resolution, measurement time, measurement distance.
In order to effectively promote above-mentioned four indices, the various improvement projects based on traditional BOTDA system are arisen at the historic moment in recent years.Specifically including that pre-pumping method, the method enters before sensor fibre in pumping pulse, is previously implanted segment length's pulse that power is relatively low, such that before pumping pulse arrives, prepulsing just produces the phonon of stable state with detection light action.The method breaches the restriction to spatial resolution of the phonon relaxation time effectively, improves spatial resolution；Dark pulse method, contrary with bright pulse, when not having pulse, pumping has stronger power, and pumping has extremely low power when there being pulse.So before dark pulse arrives, phonon can be full of whole section of sensor fibre, and detection light obtains the brillouin gain summation of whole section of optical fiber, once dark pulse arrives, detection light will lack the brillouin gain that dark pulse part is corresponding, thus realizing higher spatial resolution；π impulse method, the method is similar with dark pulse method, simply by π phase impulse that dark pulse partial replacement is identical with other Partial Powers.Equally, when π pulse arrives, detection light disappearance is not only brillouin gain corresponding to dark pulse part, and also has and detect, owing to π pulse-echo is added to, the gain brought on light, and its signal to noise ratio has aobvious acute lifting, is about 2 times of dark pulse；Traditional BOTDA scheme, to method, is namely measured 2 times by differential pulse with the two pairs of pulses having small difference in pulse width, and the difference that 2 times are measured signal is this brillouin gain corresponding to tiny differential pulse.The program can obtain ultimate attainment spatial resolution in theory, and avoids the restriction of the brillouin gain spectrum widening problem owing to short pulse punching causes and phonon relaxation.
In realizing process of the present invention, inventor have found that in prior art, at least there are the following problems:
Traditional BOTDA system, owing to being subject to the restriction of phonon relaxation, pulse width can not less than the phonon relaxation time, otherwise can cause that phonon does not reach stable state, signal to noise ratio is caused to decline, brillouin gain spectrum widening, frequency resolution reduces, and so significantly limit the further raising of spatial resolution.Pre-pumping method to some extent solves the restriction of phonon relaxation by pre-one section of pulse of pumping in advance, but distance sensing is limited, and the sensing of distance can cause the gain that the brillouin gain of pulse base brings more than pulse itself.Dark pulse method due to dark pulse part pumping pulse and detection light between almost without inspiring phonon, cause in a period of time after dark pulse, the loss of brillouin gain is created due to the deficiency of phonon, i.e. " secondaryecho ", so can make calculate Brillouin shift error increase.Although and its signal to noise ratio of impulse method doubles than dark pulse, but still the defect same with dark pulse can be subject to, the practicality of influential system.As for differential pulse to method, really can obtain high spatial resolution and frequency resolution and long-distance sensing, but owing to needs are measured 2 times, length consuming time, its response time is 2 times of traditional B OTDA.
Summary of the invention
(1) to solve the technical problem that
The present invention proposes a kind of differential type temperature sensor based on stimulated Brillouin effect, realizes high spatial resolution and long measurement Distance-sensing, it is achieved higher frequency resolution simultaneously.
(2) technical scheme
For solving above-mentioned technical problem, the invention provides a kind of differential type temperature sensor based on stimulated Brillouin effect, including:
For producing pump light and the detection light generation unit of light, the first modulation amplifying unit, the second modulation amplifying unit, wave filter, time delay optical fiber, three-dB coupler, the polarizer, the 3rd modulation amplifying unit, scrambler, isolator, sensor fibre, circulator and photodetector；
The pump light that described smooth generation unit produces carries out double sideband modulation by described first modulation amplifying unit and obtains comprising the signal of stokes light and anti-Stokes light, then pass through the second modulation amplifying unit and carry out phase-modulation, obtain phase modulated signal, described phase modulated signal leaches stokes light and anti-Stokes light by described wave filter, described stokes light after described time delay optical fiber and described anti-Stokes light synthesize a road optical signal by described three-dB coupler after carry out the extraction of polarized light through the described polarizer, the polarized light extracted is modulated amplifying unit by the described 3rd and is carried out the modulation of preset strength and amplification obtains pumping pulse light, described pumping pulse light is injected the first end of described sensor fibre；
Described smooth generation unit produce detection light through described disturb inclined instrument after by described isolator inject described sensor fibre the other end, in described sensor fibre, it is transferred to described photodetector with after described pumping pulse light generation excited Brillouin effect by described circulator, described photodetector is converted into the signal of telecommunication.
Preferably, the described differential type temperature sensor based on stimulated Brillouin effect also includes oscillograph, is connected with the outfan of described photodetector, carries out output display for the signal of telecommunication that described photodetector is formed.
Preferably, described smooth generation unit includes the laser instrument and the fiber coupler that are sequentially connected with, it is 1550nm that described laser instrument is used for launching wavelength, and power is the laser of 15.5dBm, and described fiber coupler for being divided into pump light and detection light by the laser that described laser instrument is launched.
Preferably, the splitting ratio of described fiber coupler is 10:90.
Preferably, described first the first electrooptic modulator and the first fiber amplifier that amplifying unit includes being sequentially connected with is modulated；
Described first electrooptic modulator is for being modulated to suppressed-carrier double side band signal by pump light, and described double-sideband signal comprises stokes light and anti-Stokes light, and described double-sideband signal carries out signal amplification through described first fiber amplifier.
Preferably, described second the second electrooptic modulator and the second fiber amplifier that amplifying unit includes being sequentially connected with is modulated；
Described second electrooptic modulator carries out phase-modulation for the double-sideband signal modulating amplifying unit output to described first, and the signal after phase-modulation carries out signal amplification through described second fiber amplifier.
Preferably, the described 3rd the 3rd electrooptic modulator and the 3rd fiber amplifier that amplifying unit includes being sequentially connected with is modulated；
Described 3rd electrooptic modulator carries out, for the polarized light that the described polarizer is extracted, the intensity modulated that width is 60ns, obtains pumping pulse light, and described pumping pulse light is amplified by the 3rd fiber amplifier.
Preferably, the described differential type temperature sensor based on stimulated Brillouin effect also includes several Polarization Controllers, and several Polarization Controllers described keep identical peak power and polarization state to enter described 3rd electrooptic modulator for controlling described stokes light with anti-Stokes light.
Preferably, described sensor fibre is single-mode fiber.
(3) beneficial effect
Differential type temperature sensor based on stimulated Brillouin effect provided by the invention, make sensor the difference component of variations in temperature on optical fiber only can be detected, that is where the change detection light of where is it temperature will experience brillouin gain, and when not having variations in temperature, the brillouin gain difference of detection light experience remains 0.And under the premise not increasing the measurement time, the present invention can realize high spatial resolution and long measurement Distance-sensing, it is often more important that it is to variations in temperature and sensitivity thereof, it is possible to realize higher frequency resolution simultaneously.
Accompanying drawing explanation
Being more clearly understood from the features and advantages of the present invention by reference accompanying drawing, accompanying drawing is schematic and should not be construed as and the present invention is carried out any restriction, in the accompanying drawings:
Fig. 1 is the structured flowchart of a kind of differential type temperature sensor based on stimulated Brillouin effect that the present invention proposes；
Fig. 2 is the operation principle schematic diagram of a kind of differential type temperature sensor based on stimulated Brillouin effect that the present invention proposes；
Fig. 3 is the experimental program figure of a kind of differential type temperature sensor based on stimulated Brillouin effect that the embodiment of the present invention proposes；
Fig. 4 (a) for scanning the schematic diagram of the three-dimensional brillouin gain spectrum obtained with the frequency interval of 2KHz in the embodiment of the present invention；
Fig. 4 (b) for scanning the brillouin gain that the obtains graphics with frequency and change in location with the frequency interval of 2KHz in the embodiment of the present invention；
Fig. 5 (a) for emulating the three-dimensional brillouin gain spectrum schematic diagram obtained when the Brillouin shift difference in temperature variant area with temperature-resistant region is 1MHz in the embodiment of the present invention；
Fig. 5 (b) is the existing π impulse method three-dimensional brillouin gain spectrum schematic diagram that emulation obtains when the Brillouin shift difference in temperature variant area with temperature-resistant region is 1MHz
Fig. 6 is the time-domain curve of three typical frequencies place brillouin gains of the end (13.7m place) of temperature variant area in the embodiment of the present invention；
Fig. 7 (a) for the embodiment of the present invention and existing π impulse method for different temperature variant area poor with Brillouin shift in temperature-resistant region at 13.7m place corresponding to brillouin gain spectrum；
Fig. 7 (b) draws the schematic diagram of Brillouin shift in temperature variant area for embodiment of the present invention the Fitting Calculation.
Detailed description of the invention
For making the purpose of the embodiment of the present invention, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is a part of embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under not making creative work premise, broadly fall into the scope of protection of the invention.
Fig. 1 is the structured flowchart of a kind of differential type temperature sensor based on stimulated Brillouin effect that the present invention proposes, as it is shown in figure 1, include:
Light generation unit 1, first for producing pump light and detection light is modulated amplifying unit 2, second and is modulated amplifying unit 3, wave filter 4, time delay optical fiber 5, three-dB coupler 6, the polarizer the 7, the 3rd modulation amplifying unit 8, scrambler 9, isolator 10, sensor fibre 11, circulator 12 and photodetector 13；
The pump light that described smooth generation unit 1 produces carries out double sideband modulation by described first modulation amplifying unit 2 and obtains comprising the signal of stokes light and anti-Stokes light, then pass through the second modulation amplifying unit 3 and carry out phase-modulation, obtain phase modulated signal, described phase modulated signal leaches stokes light and anti-Stokes light by described wave filter 4, described stokes light after described time delay optical fiber 5 and described anti-Stokes light synthesize a road optical signal by described three-dB coupler 6 after carry out the extraction of polarized light through the described polarizer 7, the polarized light extracted is modulated amplifying unit 8 by the described 3rd and is carried out the modulation of preset strength and amplification obtains pumping pulse light, described pumping pulse light is injected the first end of described sensor fibre 11；
The detection light that described smooth generation unit 1 produces injects the other end of described sensor fibre 11 after described scrambler 9 by described isolator 10, in described sensor fibre 11, it is transferred to described photodetector 13 with after described pumping pulse light generation excited Brillouin effect by described circulator 12, described photodetector 13 is converted into the signal of telecommunication.
Fig. 2 is the operation principle schematic diagram of a kind of differential type temperature sensor based on stimulated Brillouin effect that the present invention proposes；
As in figure 2 it is shown, based on stimulated Brillouin effect differential type temperature sensor operation principle particularly as follows:
Comprise anti-Stokes frequency v0+fmWith stokes frequency v0-fmPump light from optical fiber one section injection, after they are phase-modulated simultaneously, it is divided into two-way by wave filter, make the relatively other sideband time delay T of a wherein sideband, then regulating the Polarization Controller on two sidebands keeps their peak power consistent with polarization state after they are synthesized a road by three-dB coupler, they are modulated into pulse that width is 60ns again, and after the amplification of fiber amplifier, the frequency with reverse transfer is v0Detection light meet in sensor fibre and excite Brillouin scattering.Detection light common portion before two pulses, accepts the amplification of anti-Stokes pulse and the decay of Stokes pulse, and the common portion of two pulses is used only for being formed the phonon of stable state, and the impact of carrier power is just cancelled out each other.And in time delay T part, detection light is owing to running into the anti-Stokes pulse of π phase place, the gain amplifier of reflection equivalent anti-Stokes pulse so that detection light accepts anti-Stokes pulse and the decay of Stokes pulse simultaneously, the aobvious play of signal to noise ratio promotes.After delay component, the upper and lower two equal main manifestations of sideband are π phase place phonon and progressively tend to stable state, and the impact of carrier power is slowly just cancelled out each other again by anti-Stokes pulse and Stokes pulse.Leach carrier component by wave filter, the temperature along fiber lengths distribution or stress information can be learnt.
Sensor fibre 11 in the embodiment of the present invention is single-mode fiber.
The differential type temperature sensor based on stimulated Brillouin effect that the embodiment of the present invention proposes, also includes oscillograph, and this oscillograph is connected with the outfan of photodetector, carries out output display for the signal of telecommunication that photodetector is formed.
In the embodiment of the present invention, light generation unit 1 includes the laser instrument and the fiber coupler that are sequentially connected with, it is 1550nm that described laser instrument is used for launching wavelength, and power is the laser of 15.5dBm, and described fiber coupler for being divided into pump light and detection light by the laser that described laser instrument is launched.Wherein, the splitting ratio of fiber coupler is 10:90.
In the embodiment of the present invention, the first modulation amplifying unit 2 includes the first electrooptic modulator and the first fiber amplifier that are sequentially connected with；
Described first electrooptic modulator is for being modulated to suppressed-carrier double side band signal by pump light, and described double-sideband signal comprises stokes light and anti-Stokes light, and described double-sideband signal carries out signal amplification through described first fiber amplifier.
In the embodiment of the present invention, the second modulation amplifying unit 3 includes the second electrooptic modulator and the second fiber amplifier that are sequentially connected with；
Described second electrooptic modulator carries out phase-modulation for the double-sideband signal modulating amplifying unit output to described first, and the signal after phase-modulation carries out signal amplification through described second fiber amplifier.
In the embodiment of the present invention, the 3rd modulation amplifying unit 8 includes the 3rd electrooptic modulator and the 3rd fiber amplifier that are sequentially connected with；Described 3rd electrooptic modulator carries out, for the polarized light that the described polarizer is extracted, the intensity modulated that width is 60ns, obtains pumping pulse light, and described pumping pulse light is amplified by the 3rd fiber amplifier.
The embodiment of the present invention propose based on the differential type temperature sensor of stimulated Brillouin effect also includes several Polarization Controllers, several Polarization Controllers described keep identical peak power and polarization state to enter described 3rd electrooptic modulator for controlling described stokes light and anti-Stokes light.
The technical scheme present invention proposed below by specific embodiment is described in detail.
Fig. 3 is the experimental program figure of a kind of differential type temperature sensor based on stimulated Brillouin effect that the embodiment of the present invention proposes.
The embodiment of the present invention, as it is shown on figure 3, a wavelength is the narrow linewidth laser of 1550nm, sends the laser of 15.5dBm, is divided into two-way by the fiber coupler of 10:90, and wherein, upper road is as pump light, and lower road is as detection light.nullThe continuous pump light on upper road is first modulated to suppressed-carrier double side band signal by the first electrooptic modulator (EOM1)，Namely Stokes and anti-Stokes frequency light are comprised，Phase-modulation is done by the second electrooptic modulator (EOM2) after the first fiber amplifier (EDFA1) amplifies，Stokes light and anti-Stokes light is leached respectively by programmable filter (Waveshaper4000S) after amplifying then through the second fiber amplifier (EDFA2)，Wherein stokes light is synthesized behind a road through a polarizer by three-dB coupler with anti-Stokes light after one section of time delay optical fiber，Regulate the Polarization Controller PC1-PC5 of two branch path respectively to keep both to have identical peak power and polarization state entering the 3rd electrooptic modulator (EOM3) and do the intensity modulated that width is 60ns，Pumping pulse light out is by injecting sensor fibre after the amplification of the 3rd fiber amplifier (EDFA3).On the other hand, detection light squeezed into from sensor fibre tail end by an isolator through disturbing inclined instrument, in optical fiber with pumping pulse light generation excited Brillouin effect after through circulator, photodetector be converted into the signal of telecommunication and export on oscillograph.
Sensor fibre in the embodiment of the present invention is a segment length is the general single mode fiber of 21.5m, Brillouin's frequency at room temperature is 10.873GHz, the heating region of one section of 50cm is wherein had in 13.2m to 13.7m interval, temperature is higher about 40 degree than room temperature, and theoretical Brillouin's frequency of its correspondence is 10.909GHz.The brillouin gain obtained after scanning with the frequency interval of 2MHz is with shown in graphics such as Fig. 4 (a) and Fig. 4 (b) of position and frequency change, and Fig. 4 (a) scans the schematic diagram of the three-dimensional brillouin gain spectrum obtained for the embodiment of the present invention with the frequency interval of 2KHz；Fig. 4 (b) scans the brillouin gain that the obtains graphics with frequency and change in location for the embodiment of the present invention with the frequency interval of 2KHz；From Fig. 4 (a) and Fig. 4 (b), the variations in temperature of heating region is significantly detected, and the brillouin gain in other non-heated regions is zero.In order to further prove effectiveness of the invention, shown in three-dimensional brillouin gain spectrum such as Fig. 5 (a) and Fig. 5 (b) time relatively the scheme of technical scheme and tradition π impulse method Brillouin shift difference in temperature variant area with temperature-resistant region is 1MHz, Fig. 5 (a) is the embodiment of the present invention three-dimensional brillouin gain spectrum schematic diagram that emulation obtains when the Brillouin shift difference in temperature variant area with temperature-resistant region is 1MHz；Fig. 5 (b) is the existing π impulse method three-dimensional brillouin gain spectrum schematic diagram that emulation obtains when the Brillouin shift difference in temperature variant area with temperature-resistant region is 1MHz；Comparison diagram 4 (a) and Fig. 5 (a), it is seen that adopt the three-dimensional brillouin gain spectrum that the differential type temperature sensor based on stimulated Brillouin effect that the present invention proposes obtains conscientiously believable, also demonstrate the feasibility of the present invention from emulation.And relatively can be seen that of Fig. 5 (a) and Fig. 5 (b), the differential type temperature sensor based on stimulated Brillouin effect that the present invention proposes only detects the differential gain of variations in temperature, and automatically filtered direct current component gain, compare other traditional schemes and detect direct current component gain and the differential gain of variations in temperature simultaneously, be effectively improved signal to noise ratio.Further, from this two width figure it can also be seen that when variations in temperature is minimum, such as the frequency shift (FS) of 1MHz, traditional π impulse method cannot detect the region of the change of temperature, and the present invention can detect the change of temperature with being apparent from.Therefore, the differential type temperature sensor based on stimulated Brillouin effect that the present invention proposes can detect the slight temperature change in sensor fibre effectively.
Fig. 6 is the variations in temperature end in the embodiment of the present invention (13.7m place) time-domain curve at three typical frequencies place brillouin gains, such as Fig. 6, for different frequency shift (FS)s, the time-domain curve of the brillouin gain that present invention detection obtains presents antisymmetry type, compare unimodal Lorentz lorentz's type fitting precision higher, Brillouin's frequency calculates more accurate, and its peak gain substantially increases with frequency shift (FS).And traditional π impulse method, Lorentz lorentz's type gain spectral that signal to noise ratio is higher has just been presented when there is no variations in temperature, skew along with frequency, this Lorentz lorentz's type gain spectral only has faint skew, when there is system noise, it is difficult to accurately identify out Brillouin's frequency that both are corresponding at peak gain place.
Fig. 7 (a) for the embodiment of the present invention and existing π impulse method for different temperature variant area poor with Brillouin shift in temperature-resistant region at 13.7m place corresponding to brillouin gain spectrum；；Fig. 7 (b) draws the schematic diagram of Brillouin shift in temperature variant area for embodiment of the present invention the Fitting Calculation.As it is shown in fig. 7, the gain spectral that temperature variant area different in Fig. 7 (a) is corresponding at z=13.7m place with Brillouin shift difference in temperature-resistant region, wherein solid line is the result of the present invention, and dotted line is the result of tradition π impulse method；In order to embody the spatial resolution of this example, Fig. 7 (b) is by Brillouin's frequency of each point in matching temperature variant area and calculates its center frequency value, the relatively response time of this curve 10% to 90% power, can draw, it is proposed that scheme in spatial resolution, the phase delay being really solely dependent upon two pumping pulses is poor.
Differential type temperature sensor based on stimulated Brillouin effect provided by the invention, it is simultaneously achieved the key technical indexes of ideal distributed Brillouin's temperature sensor, including: high spatial resolution, high frequency resolution, long range measurements and measuring the time normally, simultaneously as the present invention only detects the relative quantity of variations in temperature, having higher detection efficiency and temperature resolution, putting into for Brillouin's temperature or strain gauge actually used has very big impetus.
Embodiment of above is merely to illustrate the present invention; and it is not limitation of the present invention; those of ordinary skill about technical field; without departing from the spirit and scope of the present invention; can also make a variety of changes and modification; therefore all equivalent technical schemes fall within scope of the invention, and the scope of patent protection of the present invention should be defined by the claims.
Claims (9)
1. the differential type temperature sensor based on stimulated Brillouin effect, it is characterised in that including:
For producing pump light and the detection light generation unit of light, the first modulation amplifying unit, the second modulation amplifying unit, wave filter, time delay optical fiber, three-dB coupler, the polarizer, the 3rd modulation amplifying unit, scrambler, isolator, sensor fibre, circulator and photodetector；
The pump light that described smooth generation unit produces carries out double sideband modulation by described first modulation amplifying unit and obtains comprising the signal of stokes light and anti-Stokes light, then pass through the second modulation amplifying unit and carry out phase-modulation, obtain phase modulated signal, described phase modulated signal leaches stokes light and anti-Stokes light by described wave filter, described stokes light after described time delay optical fiber and described anti-Stokes light synthesize a road optical signal by described three-dB coupler after carry out the extraction of polarized light through the described polarizer, the polarized light extracted is modulated amplifying unit by the described 3rd and is carried out the modulation of preset strength and amplification obtains pumping pulse light, described pumping pulse light is injected the first end of described sensor fibre；
Described smooth generation unit produce detection light through described disturb inclined instrument after by described isolator inject described sensor fibre the other end, in described sensor fibre, it is transferred to described photodetector with after described pumping pulse light generation excited Brillouin effect by described circulator, described photodetector is converted into the signal of telecommunication.
2. the differential type temperature sensor based on stimulated Brillouin effect according to claim 1, it is characterised in that also include oscillograph, be connected with the outfan of described photodetector, carries out output display for the signal of telecommunication that described photodetector is formed.
3. the differential type temperature sensor based on stimulated Brillouin effect according to claim 1 and 2, it is characterized in that, described smooth generation unit includes the laser instrument and the fiber coupler that are sequentially connected with, it is 1550nm that described laser instrument is used for launching wavelength, power is the laser of 15.5dBm, and described fiber coupler for being divided into pump light and detection light by the laser that described laser instrument is launched.
4. the differential type temperature sensor based on stimulated Brillouin effect according to claim 3, it is characterised in that the splitting ratio of described fiber coupler is 10:90.
5. the differential type temperature sensor based on stimulated Brillouin effect according to claim 1 and 2, it is characterised in that described first modulation amplifying unit includes the first electrooptic modulator and the first fiber amplifier that are sequentially connected with；
Described first electrooptic modulator is for being modulated to suppressed-carrier double side band signal by pump light, and described double-sideband signal comprises stokes light and anti-Stokes light, and described double-sideband signal carries out signal amplification through described first fiber amplifier.
6. the differential type temperature sensor based on stimulated Brillouin effect according to claim 1 and 2, it is characterised in that described second modulation amplifying unit includes the second electrooptic modulator and the second fiber amplifier that are sequentially connected with；
Described second electrooptic modulator carries out phase-modulation for the double-sideband signal modulating amplifying unit output to described first, and the signal after phase-modulation carries out signal amplification through described second fiber amplifier.
7. the differential type temperature sensor based on stimulated Brillouin effect according to claim 1 and 2, it is characterised in that described 3rd modulation amplifying unit includes the 3rd electrooptic modulator and the 3rd fiber amplifier that are sequentially connected with；
Described 3rd electrooptic modulator carries out, for the polarized light that the described polarizer is extracted, the intensity modulated that width is 60ns, obtains pumping pulse light, and described pumping pulse light is amplified by the 3rd fiber amplifier.
8. the differential type temperature sensor based on stimulated Brillouin effect according to claim 7, it is characterized in that, also including several Polarization Controllers, several Polarization Controllers described keep identical peak power and polarization state to enter described 3rd electrooptic modulator for controlling described stokes light with anti-Stokes light.
9. the differential type temperature sensor based on stimulated Brillouin effect according to claim 1 and 2, it is characterised in that described sensor fibre is single-mode fiber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410815888.4A CN105784190B (en) | 2014-12-23 | 2014-12-23 | A kind of differential type temperature sensor based on stimulated Brillouin effect |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410815888.4A CN105784190B (en) | 2014-12-23 | 2014-12-23 | A kind of differential type temperature sensor based on stimulated Brillouin effect |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105784190A true CN105784190A (en) | 2016-07-20 |
| CN105784190B CN105784190B (en) | 2019-10-18 |
Family
ID=56377483
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410815888.4A Active CN105784190B (en) | 2014-12-23 | 2014-12-23 | A kind of differential type temperature sensor based on stimulated Brillouin effect |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105784190B (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106225949A (en) * | 2016-08-04 | 2016-12-14 | 电子科技大学 | Wavelength-division multiplex dual-wavelength optical-fiber delay temperature sensor |
| CN106959167A (en) * | 2017-05-12 | 2017-07-18 | 暨南大学 | Measurement apparatus, Brillouin optical time-domain reflectometer and brillouin frequency shift measurement system |
| CN108692766A (en) * | 2018-05-21 | 2018-10-23 | 北京邮电大学 | BFS measuring devices, method and distributed fiber-optic sensor system |
| CN110445009A (en) * | 2019-07-29 | 2019-11-12 | 北京邮电大学 | Optical fiber Brillouin amplifier based on orthogonal double pumping action |
| CN110487309A (en) * | 2019-09-16 | 2019-11-22 | 北京邮电大学 | A kind of fiber-optic probe method and system |
| CN111913052A (en) * | 2020-06-03 | 2020-11-10 | 北京无线电计量测试研究所 | Radio-over-fiber control module and radio-over-fiber cross-correlation detection system |
| CN112414584A (en) * | 2020-10-19 | 2021-02-26 | 太原理工大学 | Brillouin optical time domain analysis device and method based on pi-pulse Gray code coding |
| CN113595638A (en) * | 2021-07-21 | 2021-11-02 | 华南师范大学 | BOTDA system based on four-frequency-division driving |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2502275C (en) * | 2004-03-26 | 2008-08-05 | University Of New Brunswick | System and method for resolution enhancement of a distributed sensor |
| CN101506635A (en) * | 2006-08-24 | 2009-08-12 | 住友电气工业株式会社 | Optical fiber temperature sensor |
| CN101975626A (en) * | 2010-10-13 | 2011-02-16 | 华中科技大学 | Brillouin scattering based distributive fiber sensing system |
| CN102353474A (en) * | 2010-05-18 | 2012-02-15 | 华北电力大学（保定） | Seawater temperature profile BOTDA measuring method based on optical fiber Brillouin scattering principle |
| CN102645236A (en) * | 2012-04-06 | 2012-08-22 | 南昌航空大学 | BOTDA (Brillouin Optical Time-domain Analyzer) system based on comb frequency spectrum continuous probe beam |
| CN102998025A (en) * | 2012-12-18 | 2013-03-27 | 华北电力大学（保定） | Measuring method for pulse pre-pump rayleigh BOTDA (Brilouin optical time domain analysis) temperature and strain |
| CN103063325A (en) * | 2013-01-16 | 2013-04-24 | 电子科技大学 | Brillouin optical time domain analysis (BOTDA) temperature and strain simultaneous measurement method based on large effective area fiber (LEAF) |
-
2014
- 2014-12-23 CN CN201410815888.4A patent/CN105784190B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2502275C (en) * | 2004-03-26 | 2008-08-05 | University Of New Brunswick | System and method for resolution enhancement of a distributed sensor |
| CN101506635A (en) * | 2006-08-24 | 2009-08-12 | 住友电气工业株式会社 | Optical fiber temperature sensor |
| CN102353474A (en) * | 2010-05-18 | 2012-02-15 | 华北电力大学（保定） | Seawater temperature profile BOTDA measuring method based on optical fiber Brillouin scattering principle |
| CN101975626A (en) * | 2010-10-13 | 2011-02-16 | 华中科技大学 | Brillouin scattering based distributive fiber sensing system |
| CN102645236A (en) * | 2012-04-06 | 2012-08-22 | 南昌航空大学 | BOTDA (Brillouin Optical Time-domain Analyzer) system based on comb frequency spectrum continuous probe beam |
| CN102998025A (en) * | 2012-12-18 | 2013-03-27 | 华北电力大学（保定） | Measuring method for pulse pre-pump rayleigh BOTDA (Brilouin optical time domain analysis) temperature and strain |
| CN103063325A (en) * | 2013-01-16 | 2013-04-24 | 电子科技大学 | Brillouin optical time domain analysis (BOTDA) temperature and strain simultaneous measurement method based on large effective area fiber (LEAF) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106225949A (en) * | 2016-08-04 | 2016-12-14 | 电子科技大学 | Wavelength-division multiplex dual-wavelength optical-fiber delay temperature sensor |
| CN106959167A (en) * | 2017-05-12 | 2017-07-18 | 暨南大学 | Measurement apparatus, Brillouin optical time-domain reflectometer and brillouin frequency shift measurement system |
| CN108692766A (en) * | 2018-05-21 | 2018-10-23 | 北京邮电大学 | BFS measuring devices, method and distributed fiber-optic sensor system |
| CN110445009A (en) * | 2019-07-29 | 2019-11-12 | 北京邮电大学 | Optical fiber Brillouin amplifier based on orthogonal double pumping action |
| CN110487309A (en) * | 2019-09-16 | 2019-11-22 | 北京邮电大学 | A kind of fiber-optic probe method and system |
| CN111913052A (en) * | 2020-06-03 | 2020-11-10 | 北京无线电计量测试研究所 | Radio-over-fiber control module and radio-over-fiber cross-correlation detection system |
| CN112414584A (en) * | 2020-10-19 | 2021-02-26 | 太原理工大学 | Brillouin optical time domain analysis device and method based on pi-pulse Gray code coding |
| CN113595638A (en) * | 2021-07-21 | 2021-11-02 | 华南师范大学 | BOTDA system based on four-frequency-division driving |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105784190B (en) | 2019-10-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105784190A (en) | Stimulated Brillouin effect-based differential temperature sensor | |
| AU2018343339B2 (en) | Tailor distributed amplification for fiber sensing | |
| US10359302B2 (en) | Non-linear interactions with backscattered light | |
| Chen et al. | 108-km Distributed Acoustic Sensor With 220-p $\varepsilon/\surd $ Hz Strain Resolution and 5-m Spatial Resolution | |
| CN106525096B (en) | A kind of brillouin distributed optical fiber sensing device and reduce gain spectral line width method | |
| CN103364106B (en) | A kind of Brillouin optical time domain analysis sensor-based system based on the pumping of overlength loop laser | |
| CN102829807B (en) | BOTDA (Brillouin Optical Time Domain Analyzer) and POTDR (Polarization Optical Time Domain Reflectometer) combined distributed type optical fiber sensing system | |
| CN105067143B (en) | A kind of homodyne Brillouin optical time-domain reflectometer based on Raman amplifiction | |
| KR101310783B1 (en) | Distributed optical fiber sensor and sensing method using simultaneous sensing of brillouin gain and loss | |
| CN109186736A (en) | It is a kind of can fixing frequency displacement structure slope auxiliary Brillouin fiber optic sensing vibration measurement device and measurement method | |
| Li et al. | An enhanced distributed acoustic sensor with large temperature tolerance based on ultra-weak fiber Bragg grating array | |
| CN103376124A (en) | Brillouin optical time domain analyzer | |
| Jostmeier et al. | Long-distance botdr interrogator with polarization-diverse coherent detection and power evaluation | |
| KR100468612B1 (en) | Fiber Optic Brillouin OTDA(Optical Time Domain Analysis) Sensor System and the Strain Measurement Method of Large Structures | |
| CN113758509B (en) | Temperature, strain and vibration integrated optical fiber sensing device | |
| CN102506915B (en) | Three-order Raman amplification technology-based Brillouin optical time domain analysis system | |
| CN109186645A (en) | A kind of pumping optical signal to noise ratio lifting device and method applied to distributive fiber optic strain demodulation | |
| Chen et al. | Development of distributed vibration sensing system based on polarization optical time domain reflectometry | |
| Nguyen et al. | Sensitivity enhancement in long-range distributed Brillouin fiber sensor using an anti-Stokes single-sideband probe and a bidirectional EDFA | |
| Chen et al. | Distributed fiber-optic acoustic sensor with long sensing range over 100 km and sub-nano strain resolution | |
| Xu et al. | Intelligent Distributed Acoustic Sensing System Based on Φ–OTDR and Phase Generated Carrier Algorithm | |
| GB2547520A (en) | Non-linear interactions with backscattered light | |
| CN113390445B (en) | Sensitivity-enhanced distributed Brillouin optical fiber bending sensor | |
| CN212843638U (en) | Compound distributed optical fiber sensor | |
| van Putten et al. | A Long Range Distributed Acoustic Sensor Based on Remotely Pumped Optical Amplifier |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |