A system for improving the sensing distance of phase-sensitive optical time-domain reflectometer
A technology of time domain reflectometry and phase sensitive light, which is applied in the direction of using optical devices to transmit sensing components, convert sensor outputs, instruments, etc. long distance effect
Active Publication Date: 2022-04-12
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 is shown in Figure 1. The system provided by the embodiment includes a laser 1, a coupler 2...
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The invention discloses a system for improving the sensing distance of a phase-sensitive optical time-domain reflectometer, comprising a light source module, a sensing optical path module and an adaptive signal processing module; the light source module generates detection light and intrinsic light and transmits them to transmission The photosensitive circuit module, the backscattered light and the intrinsic light transmitted from the detection light to the sensing optical fiber are coherent and transmitted to the adaptive signal processing module; the adaptive signal processing module coherents the incoming The light is sequentially photoelectrically converted, pre-processed, and sampled, and then sent to a computer to obtain detection results. The pre-processing includes segmented amplification, amplitude demodulation, and adaptive filtering. The system can effectively overcome the problem that the sensing signal is submerged and difficult to measure due to the lengthening of the sensing distance and the weakening of the signal. At the same time, it has the characteristics of simple structure and long single-ended 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