Distributed strain sensing system and its measurement method based on adaptive reference compensation
A technology of distributed strain and self-adaptive compensation, which is applied in the direction of measuring devices, instruments, and optical devices, etc., can solve the problems of low precision, the measurement of optical fiber sensing system is easily affected by temperature, and the range is small, so as to reduce the measurement error , Realize high-precision strain measurement and improve the effect of zero drift stability
Active Publication Date: 2020-05-19
HUAZHONG UNIV OF SCI & TECH
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[0005] In view of the above defects or improvement needs of the prior art, the present invention provides a distributed strain sensing system based on adaptive reference compensation and its measurement method, aiming at solving the problem that the measurement of the existing optical fiber sensing system is easily affected by temperature, range Small and inaccurate problems
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[0035] 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, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.
[0036] figure 1It is a schematic diagram of a distributed optical fiber strain sensing system based on adaptive reference compensation provided by the present invention. The distributed strain sensing system includes a light source module 1. The light source module 1 is used to generate two continuous narrow line width lasers, and the two output light They are respectively connected to the puls...
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The invention discloses a distributed strain sensing system based on self-adaptive reference compensation and a measuring method thereof. The system comprises a light source module, a pulse modulationmodule, a circulator, a strain sensing optical cable, a coherent receiving module, a signal processing module and a self-adaptive compensation module. The system demodulates the phase information ofeach point in the strain sensing optical cable in real time in a coherent phase demodulation mode. The specially packaged strain sensing optical cable comprises a strain sensing optical fiber and a reference optical fiber, and the strain sensing optical fiber is subjected to real-time compensation of phase noise caused by temperature drift and laser frequency drift through phase change in the reference optical fiber. In order to achieve high-precision phase compensation, the system adopts an adaptive compensation method to carry out real-time tracking and self-adaptive phase compensation on the phase information of the reference optical fiber. Compared with the prior art, the system can effectively inhibit temperature drift and laser light source phase jitter and achieve high-precision distributed strain sensing.
Description
technical field [0001] The invention belongs to the field of optical fiber sensing, and more specifically relates to a distributed strain sensing system based on adaptive reference compensation and a measurement method thereof. Background technique [0002] my country is an earthquake-prone country with many seismically active areas. Strong earthquakes have occurred frequently in history. Strong earthquakes have caused serious loss of life and property to the people of our country. Studying the laws of earthquakes, finding the deterministic precursors of earthquakes, and realizing accurate earthquake predictions are the key issues that need to be solved urgently. Academician Li Siguang once pointed out that the occurrence of earthquakes is mainly due to the gradual development and intensification of the contradiction between the ground stress caused by the movement of the crust in the rock strata and the rock resistance. The ground stress is observed to find out the properti...
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IPC IPC(8): G01B11/16
CPCG01B11/161
Inventor 孙琪真刘涛李豪艾凡闫志君刘德明
Owner HUAZHONG UNIV OF SCI & TECH