CN104729549A - Two-way chaos ring laser distributed optical fiber sensing system and time difference positioning method thereof - Google Patents
Two-way chaos ring laser distributed optical fiber sensing system and time difference positioning method thereof Download PDFInfo
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- CN104729549A CN104729549A CN201510136273.3A CN201510136273A CN104729549A CN 104729549 A CN104729549 A CN 104729549A CN 201510136273 A CN201510136273 A CN 201510136273A CN 104729549 A CN104729549 A CN 104729549A
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Abstract
The invention discloses a two-way chaos ring laser distributed optical fiber sensing system and a time difference positioning method thereof. The system comprises a ring laser which is formed by sequentially connecting a semiconductor optical amplifier, a polarization controller, a coupler and a sensing optical fiber through optical fiber patch cords, polarization analyzers, photoelectric detectors and a data acquisition and processing system. Output beams of the ring laser enter the two photoelectric detectors through the two polarization analyzers to be converted into electric signals and enter the data acquisition and processing system. The positioning method comprises the steps that an auto-correlation function of any path of non-disturbance chaotic waveform is calculated in advance, and a time interval of adjacent auto-correlation peaks is a frame size t; a disturbance frame is determined through a frame number of a cross-correlation peak of a chaotic waveform of adjacent frames when the cross-correlation peak begins to decline; the disturbance frame and a previous frame and a next frame all subtract a waveform of a previous non-disturbance frame of the corresponding frame, duration time D<t> of a waveform which is different from a previous waveform and a next waveform is determined, and a disturbance position is calculated through a formula (please see the formula in the specification), wherein the v is the speed of light in a fiber core.
Description
Technical field
The present invention relates to a kind of two-way chaos ring laser Distributed optical fiber sensor system and digital method thereof.
Background technology
In chaos ring laser Distributed optical fiber sensor system, we once proposed unidirectional ring laser Distributed optical fiber sensor system structure and interframe cross-correlation positioning method thereof and short-term cross-correlation positioning method.But the sensitivity of unidirectional ring laser optical fiber sensing system is lower, response is also slow, so we are improved to two-way Polarization Chaos optical fiber ring laser structure it, the sensitivity of this structure is higher, responds also fast.In location, interframe cross-correlation method needs the graph of relation drawing disturbance location and cross-correlation peak value in advance, and can not position multipoint disturbance.And the rely benchmark of location of cross-correlation method is as the reference position of fiber optic loop corresponding to ring laser from pulse in the system output waveform of frame head in short-term, a frame time of such chaotic waves and the fiber position of fiber optic loop are one to one.But be constantly transmission change in ring from pulse, be not always corresponding with the reference position of ring, cause positioning result to there is inevitable stochastic error.Therefore, we also been proposed a kind of digital method of two-way Polarization Chaos ring laser Distributed optical fiber sensor system.When thanksing for your hospitality action and being used on sensor fibre, there is one section of waveform obviously different from waveform before and after it in the output time-domain waveform of this sensor-based system, its duration just in time equals disturbing signal and arrives the mistiming Δ t at sensor fibre two ends with counter clockwise direction clockwise respectively from disturbance location, the length of known whole sensor fibre or the frame length τ of ring laser, as long as obtain this mistiming Δ t, the position that disturbance occurs just can be obtained through converting.This localization method simple and fast, and there is not the stochastic problems of positioning datum.
Summary of the invention
The object of the invention is to the defect existed for prior art, a kind of two-way chaos ring laser Distributed optical fiber sensor system and digital method thereof are provided.
For achieving the above object, the present invention adopts following technical scheme:
A kind of two-way chaos ring laser Distributed optical fiber sensor system, comprises semiconductor optical amplifier, coupling mechanism, Polarization Controller, sensor fibre, the first analyzer, the second analyzer, the first photodetector, the second photodetector and data Collection & Processing System; Described semiconductor optical amplifier, coupling mechanism, Polarization Controller and the sensor fibre standard single-mode fiber wire jumper that comprises is connected successively, form optical fiber ring laser, the a port of described coupling mechanism connects semiconductor optical amplifier, the I port of described coupling mechanism connects Polarization Controller, and the II port of described coupling mechanism connects the first analyzer; The b port of described coupling mechanism connects the second analyzer, described first analyzer connects the first photodetector, described second analyzer connects the second photodetector, enters data Collection & Processing System after light signal is changed into electric signal by described first photodetector and the second photodetector.
The two-way light path of described first analyzer and the first photodetector and described second analyzer and the second photodetector composition only get wherein a road as receiving light path, another road when working state of system is bad as the reference signal of location.
A digital method for two-way chaos ring laser Distributed optical fiber sensor system, comprises the steps:
1) the multiframe data of chaotic waves during any road light path undisturbed of prior collection, calculate its autocorrelation function, determine frame length τ by the time interval of adjacent self correlated peak;
2) calculate the cross correlation function of the consecutive frame of the chaotic waves of any road or two-way light path, which frame the sequence number determination disturbance of the frame declined by its cross-correlation peak value occurs in, and namely determines the sequence number of disturbance frame;
3) disturbance frame and front and back one frame thereof are deducted the waveform of the previous undisturbed frame of this three frame, determined to be different from the duration Δ t of one section of waveform of waveform before and after it by three frame waveforms after subtracting each other, calculate to obtain disturbance location by v × (τ+Δ t)/2.Wherein, v is the light velocity in fibre core.
The principle of work of native system and feature:
The optical fiber ring laser be connected to form by standard single-mode fiber by semiconductor optical amplifier (SOA), Polarization Controller (PC) and coupling mechanism (OC), the drive current of adjustment Polarization Controller and semiconductor optical amplifier can make laser instrument export chaotic waves.Chaotic waves has picture format structure, and its autocorrelation function has multiple self correlated peak, and the interval time of these self correlated peaks all equals light and goes in ring the once required time in ring cavity, is called frame length τ.And consecutive frame chaotic waves has similarity.This similarity can be weighed with the peak value height of the cross correlation function of two frame waveforms.The time similarity of undisturbed consecutive frame chaotic waves is fine, each cross-correlation peak is all very high, normalized-cross-correlation function is close to 1, and waveform can change after being disturbed, cause its similarity to reduce, consecutive frame cross-correlation peak also can reduce, accordingly, can find and which frame waveform there occurs disturbance from, be called disturbance frame.
When external disturbance acts on sensor fibre, disturbing signal causes the phase place of the chaos light in optical fiber to change, thus cause chaos polarisation of light state to change, because chaos system is to the susceptibility of initial value comprising polarization state, chaotic waves changes at once, the waveform of change arrives sensor fibre two ends, i.e. semiconductor optical amplifier and coupling mechanism place respectively along clockwise direction with counterclockwise through t1 and the t2 time, and exports from coupling mechanism.In this chaos sensor-based system, the connecting fiber length between SOA, OC and PC can be ignored, and SOA is in Image magnify state.After the light of both direction all arrives SOA, two-beam interacts at SOA place.Cause the part of change, due to interaction, larger change occurs by disturbance, and both direction chaos light arrive SOA time interval Δ t=t2-t1 in time domain waveform not influenced, also be different from disturbance occur before chaotic waves, therefore obviously can see in whole time domain waveform and have one period of duration to be that the time domain waveform of Δ t is all different from waveform before and after it.The length of known whole sensor fibre or frame length τ, as long as obtain this mistiming Δ t, just can obtain the position that disturbance occurs through converting.
But chaotic waves to be class random, be with the naked eye difficult to the start/stop time differentiating the change of its waveform.In order to improve the accuracy of location, each frame time domain waveform of disturbance frame and front and back thereof is deducted respectively the time domain waveform of a undisturbed frame before this three frame.Three frame time domain waveforms after subtracting each other clearly can see required mistiming Δ t, thus can obtain disturbance present position L=v × (τ+Δ t)/2.Wherein, v is the light velocity in fibre core.
The present invention compared with prior art, has following apparent outstanding substantive distinguishing features and remarkable advantage:
A kind of two-way chaos ring laser Distributed optical fiber sensor system and its system architecture of digital method thereof and data processing all very simple, therefore, the real-time of detection & localization is all fine, and accurate positioning, there is not the stochastic problems of positioning datum.
Accompanying drawing explanation
Fig. 1 is embodiment 1 system architecture schematic diagram.
Polarization Chaos waveform when Fig. 2 is the undisturbed of two-way output.
Fig. 3 is the autocorrelation function of the waveform that the first photodetector exports.
Fig. 4 is that the Polarization Chaos waveform of two-way output is by the waveform after disturbance.
Fig. 5 is the cross-correlation peak value of the Polarization Chaos waveform consecutive frame that two-way exports.
Fig. 6 is the result that the waveform of the disturbance frame by disturbance waveform that exports of the first photodetector and front 1 undisturbed frame of each 1 frame and this three frame thereafter subtracts each other.
Embodiment
The preferred embodiment of the present invention, accompanying drawings is as follows:
Embodiment 1
As shown in Figure 1, a kind of two-way chaos ring laser Distributed optical fiber sensor system, comprises semiconductor optical amplifier 1, coupling mechanism 2, Polarization Controller 3, sensor fibre 4, first analyzer 5, second analyzer 6, first photodetector 7, second photodetector 8 and data Collection & Processing System 9; Describedly comprise semiconductor optical amplifier 1, coupling mechanism 2, Polarization Controller 3 be connected successively with sensor fibre 4 standard single-mode fiber wire jumper, form optical fiber ring laser, the a port of described coupling mechanism 2 connects semiconductor optical amplifier 1, the I port of described coupling mechanism 2 connects Polarization Controller 3, and the II port of described coupling mechanism 2 connects the first analyzer 5; The b port of described coupling mechanism 2 connects the second analyzer 6, described first analyzer 5 connects the first photodetector 7, described second analyzer 6 connects the second photodetector 8, enters data Collection & Processing System 9 after light signal is changed into electric signal by described first photodetector 7 and the second photodetector 8.
In the present embodiment, BOA (Booster OpticalAmplifier) module (BOA1004S) of THORLABS company of the U.S. selected by semiconductor optical amplifier 1.The 2X2 coupling mechanism that output coupler 2 adopts Shanghai Han Yu Fibre Optical Communication Technology company limited to produce, splitting ratio is 20:80.Polarization Controller 3 adopts the optical fiber squeezer (PLC-001) of General Photonics company of the U.S..All optical fiber all adopts G.652 standard single-mode fiber.First analyzer 5 and the second analyzer 6 all adopt the tail fiber type analyzer of GeneralPhotonics company, and the first photodetector 7 and the second photodetector 8 are the PIN-TIA detector that Shenzhen Photon company produces.Data Collection & Processing System 9 is made up of PicoScope 5203 digital oscilloscope of a conventional microcomputer and PICO company of Britain, and oscillograph is sent to computing machine the data gathered, and obtains disturbance location with Matlab software programming process.
Embodiment 2
The present embodiment is substantially the same manner as Example 1, special feature is as follows: the two-way light path of described first analyzer 5 and the first photodetector 7 and described second analyzer 6 and the second photodetector 8 composition only get wherein a road as receiving light path, another road when working state of system is bad as the reference signal of location.
Embodiment 3
A digital method for two-way chaos ring laser Distributed optical fiber sensor system, comprises the steps:
The drive current of adjustment semiconductor optical amplifier 1 and Polarization Controller 3, make system works in chaos state.Gather a part of chaos data, as shown in Figure 2, the output of corresponding first photodetector of chaotic waves of top, following chaotic waves corresponds to the output of the second photodetector.The chaotic waves data selecting the first detector to export calculate its autocorrelation function, as shown in Figure 3, obtain frame length τ=16.63 μ s.A lithium niobate electro-optic phase modulator is added as simulated disturbance source at the sensor fibre place of distance semiconductor optical amplifier 3.232km, the frequency utilizing the signal generator of Agilent company (33250A) to produce is 25kHz, peak-to-peak value is 3Vpp, pulsewidth be the output under burst pattern of the pulse signal of 20us as disturbing signal, burst parameter is: cycle 10ms, 1 cycle.By the waveform after disturbance as shown in Figure 4.Can see, it is synchronous that two-way exports, and is all cluster bunch ground change by disturbance waveform.Calculate the cross correlation function of the Polarization Chaos waveform consecutive frame that two-way exports, obtain consecutive frame cross-correlation peak value figure as shown in Figure 5.The consecutive frame cross-correlation peak value that Fig. 5 shows two-way output waveform all declines from the 26th frame, and also namely their disturbance frame is all the 27th frame.The each frame of disturbance frame and front and back thereof selecting the first photodetector to export deducts the waveform of the previous undisturbed frame of this three frame, and namely the 26th, 27,28 frame waveforms deduct the 25th frame waveform, and the result obtained as shown in Figure 6.Mistiming Δ t=15.1 μ s is obtained from Fig. 6.Calculating disturbance location is L=v × (τ+Δ t)/2=3/1.472 × 10
8× (16.63+15.1) × 10
-6/ 2=3.2334km (refractive index of fibre core is taken as 1.472 here).Compared with actual disturbance location 3.232km, absolute error 1.4m, relative error 0.04%.
Claims (3)
1. a two-way chaos ring laser Distributed optical fiber sensor system, it is characterized in that, comprise semiconductor optical amplifier (1), coupling mechanism (2), Polarization Controller (3), sensor fibre (4), the first analyzer (5), the second analyzer (6), the first photodetector (7), the second photodetector (8) and data Collection & Processing System (9); Described semiconductor optical amplifier (1), coupling mechanism (2), Polarization Controller (3) are connected with standard single-mode fiber wire jumper successively with sensor fibre (4), form optical fiber ring laser, the a port of described coupling mechanism (2) connects semiconductor optical amplifier (1), the I port of described coupling mechanism (2) connects Polarization Controller (3), and the II port of described coupling mechanism (2) connects the first analyzer (5); The b port of described coupling mechanism (2) connects the second analyzer (6), described first analyzer (5) connects the first photodetector (7), described second analyzer (6) connects the second photodetector (8), enters data Collection & Processing System (9) after light signal is changed into electric signal by described first photodetector (7) and the second photodetector (8).
2. two-way chaos ring laser Distributed optical fiber sensor system according to claim 1, it is characterized in that, the two-way light path that described first analyzer (5) and the first photodetector (7) and described second analyzer (6) and the second photodetector (8) form only get wherein a road as receiving light path, another road when working state of system is bad as the reference signal of location.
3. a digital method for two-way chaos ring laser Distributed optical fiber sensor system, is characterized in that, comprise the steps:
1) the multiframe data of chaotic waves during any road light path undisturbed of prior collection, calculate its autocorrelation function, determine frame length τ by the time interval of adjacent self correlated peak;
2) calculate the cross correlation function of the consecutive frame of the chaotic waves of any road or two-way light path, which frame the sequence number determination disturbance of the frame declined by its cross-correlation peak value occurs in, and namely determines the sequence number of disturbance frame;
3) disturbance frame and front and back one frame thereof are deducted the waveform of the previous undisturbed frame of this three frame, determined to be different from the duration of one section of waveform of waveform before and after it by three frame waveforms after subtracting each other
t, by
calculate to obtain disturbance location, wherein,
vfor the light velocity in fibre core.
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| CN105973280A (en) * | 2016-06-13 | 2016-09-28 | 上海大学 | Discrete multi-switch state detecting system of optical feedback semiconductor laser and detecting method thereof |
| CN108199259A (en) * | 2017-12-25 | 2018-06-22 | 武汉光迅科技股份有限公司 | A kind of joint disturbance formula chaotic laser light signal generator and its application method |
| CN108759882A (en) * | 2018-05-03 | 2018-11-06 | 上海大学 | Semiconductor laser mutually pouring-in Distributed optical fiber sensor system and localization method |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105973280B (en) * | 2016-06-13 | 2018-04-06 | 上海大学 | The discrete Multi- Switch condition detecting system and method for light feedback semiconductor laser |
| CN108199259A (en) * | 2017-12-25 | 2018-06-22 | 武汉光迅科技股份有限公司 | A kind of joint disturbance formula chaotic laser light signal generator and its application method |
| CN108199259B (en) * | 2017-12-25 | 2020-01-17 | 武汉光迅科技股份有限公司 | Combined disturbance type chaotic laser signal generator and using method thereof |
| CN108759882A (en) * | 2018-05-03 | 2018-11-06 | 上海大学 | Semiconductor laser mutually pouring-in Distributed optical fiber sensor system and localization method |
| CN108759882B (en) * | 2018-05-03 | 2021-01-12 | 上海大学 | Semiconductor laser mutual injection type distributed optical fiber sensing system and positioning method |
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