System for increasing sensing distance of phase-sensitive optical time domain reflectometer
A technology of time-domain reflectometer and phase-sensitive light, which is applied in the direction of transmitting sensing components, converting sensor output, and measuring devices by using optical devices, can solve problems such as infeasibility, and achieve good realizability, simple system structure, and transmission long distance effect
Active Publication Date: 2021-06-08
ZHEJIANG UNIV
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On the other hand, the method of adding devices in the middle of the fiber to be tested is usually not feasible in the actual measurement environment
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[0027] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, and do not limit the protection scope of the present invention.
[0028] In order to effectively overcome the problem that the sensing signal is submerged and difficult to measure due to the extension of the sensing distance and the weakening of the signal. The embodiment provides a system for increasing the sensing distance of a phase-sensitive optical time-domain reflectometer. figure 1 The structural block diagram of the system for improving the sensing distance of the phase-sensitive optical time-domain reflectometer in the present invention, such as figure 1 As shown, the system provided by the embodiment includes a laser 1, a co...
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The invention discloses a system for increasing the sensing distance of a phase-sensitive optical time domain reflectometer. The system comprises a light source module, a sensing light path module and a self-adaptive signal processing module. The light source module generates detection light and intrinsic light and transmits the detection light and the intrinsic light to the sensing light path module. Backscattering light, transmitted to a sensing optical fiber, of the detection light and the intrinsic light are coherent in the sensing light path module and then transmitted to the self-adaptive signal processing module. The self-adaptive signal processing module sequentially performs photoelectric conversion, preprocessing and sampling on the incoming coherent light and then sends the coherent light to the computer to obtain a detection result, and the preprocessing comprises sectional amplification, amplitude demodulation and self-adaptive filtering. The system can effectively solve the problem that sensing signals are submerged and difficult to measure due to the fact that the sensing distance is lengthened and the signals are weak, and has the advantages of being simple in structure and long in single-end sensing distance.
Description
technical field [0001] The invention belongs to the field of distributed optical fiber sensing, and in particular relates to a system for increasing the sensing distance of a phase-sensitive optical time domain reflectometer. Background technique [0002] Distributed optical fiber sensing technology has the ability of distributed measurement, which can detect the continuous distribution of measured time and space. The phase-sensitive optical time domain reflectometer detects the measurement by detecting the phase change of light. It has the advantages of high resolution and anti-electromagnetic interference. It has a good application prospect and is suitable for long-distance distributed measurement. [0003] The realization of long-distance phase-sensitive optical time-domain reflectometer needs to solve the problem that the sensing signal is submerged in the noise due to the lengthening of the optical fiber distance and the weakening of the signal, so as to ensure that the...
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IPC IPC(8): G01D5/353
CPCG01D5/35306
Inventor 宋牟平王轶轩
Owner ZHEJIANG UNIV