Discretization positioning method of sagnac distributed optical fiber sensing system
A technology of sensing system and distributed optical fiber, which is applied in the pipeline system, gas/liquid distribution and storage, instruments, etc., to achieve the effects of noise insensitivity, good real-time performance, and flexible and adjustable positioning resolution
Active Publication Date: 2021-11-05
SHANGHAI UNIV
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In the aspect of distributed optical fiber sensing positioning, some scholars also use the support vector machine algorithm to approximate the disturbance position and the actual position determined by the spectrum after wavelet denoising to reduce the positioning error, but this method still needs to use the zero frequency method for preliminary positioning
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[0026] Preferred embodiments of the present invention are described as follows in conjunction with the accompanying drawings:
[0027] The monitoring of pipeline leakage by the circular Sagnac distributed optical fiber sensing system is simulated by OptiSystem software, and the feasibility of the discretization positioning method of the present invention is verified.
[0028] Such as figure 1 As shown, the simulated annular Sagnac distributed optical fiber sensing system includes a continuous laser 1, a 2×2 bidirectional 3dB optical coupler 2, a sensing fiber 3, a sensing fiber 4, a delay fiber 5, a phase modulator 6, and a photodetector 7. Data acquisition and processing unit 8. The length of sensing fiber 3 and sensing fiber 4 R 1 , R 2 The sum is equal to the length of the delay fiber R 3 . The effect of the pipeline leakage disturbance signal on the light in the sensing fiber is simulated by the phase modulator 6 . Since the bandwidth of the impact signal generate...
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The invention discloses a discrete positioning method of a Sagnac distributed optical fiber sensing system. Taking the required positioning resolution as the interval, divide the sensing fiber into several position intervals, and number each position interval; simulate the disturbance of the sensing fiber by broadband signals in each position interval, and collect the corresponding Interference signal; transform or analyze the interference signal, select the appropriate characteristic variable and its data length; use the characteristic data of the interference signal as the training input and the position interval number as the target output to construct a multi-classification model; Extract features of the interference signal caused by a disturbance in a location interval; input the characteristic data of the interference signal into the trained multi-classification model, and obtain the corresponding location interval number, which realizes the discretization and positioning of the disturbance signal. The invention is simple and effective, insensitive to noise, and has flexible and adjustable positioning resolution, and can be used for disturbance positioning of a ring or linear Sagnac distributed optical fiber sensing system.
Description
technical field [0001] The invention relates to a positioning method, in particular to a discrete positioning method of a Sagnac distributed optical fiber sensing system. Background technique [0002] Distributed optical fiber sensing system can be used for oil and gas pipeline leakage monitoring. Among them, the system based on Sagnac interferometer has the advantages of strong anti-interference and low requirements on light source, and is a hot research topic at present. For the Sagnac distributed optical fiber sensing system, when the external disturbance is a broadband signal, the spectrum of the phase change signal caused by it has periodic zero points, that is, zero frequency points. Through the relationship between the zero frequency point and the disturbance position, the position of the disturbance point can be calculated. Due to the influence of factors such as random phase drift and thermal noise in the sensing system, the zero frequency coexists with a large amo...
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IPC IPC(8): G01H9/00G06Q50/06F17D5/02
CPCF17D5/02
Inventor 方捻吕继东王陆唐
Owner SHANGHAI UNIV