OPGW optical cable seismic signal extraction method based on distributed optical fiber sensing

Abstract

The invention discloses an OPGW optical cable seismic signal extraction method based on distributed optical fiber sensing. The method comprises the following steps: a, acquiring OPGW optical cable vibration data through a distributed optical fiber vibration detection device, and storing the acquired data as an original data file; b, performing parsing and FFT spectrum analysis on data in the original data file, and extracting data in a frequency band interval of 280-380 Hz in a frequency spectrum; c, drawing a frequency-time broken line graph; d, screening out mutation points from the change rate of the frequency-time broken line graph, and matching a mutation point information with seismic information published by the seismic station network; e, performing three-frequency-band data extraction and analysis on the data near the mutation point to obtain frequency-time data of three frequency bands; and f, drawing a thermodynamic diagram according to the frequency-time data of the three frequency bands, and searching fan-shaped textures from the thermodynamic diagram. The method does not need to erect a seismic wave detection sensor, is low in cost, and is simple and practical.

Description

【Technical field】 [0001] The invention relates to a seismic signal extraction method, in particular to a low-cost, simple and practical OPGW optical cable seismic signal extraction method based on distributed optical fiber sensing. 【Background technique】 [0002] At present, seismic wave detection systems are mostly used in national professional institutions. Seismic wave detection devices are mostly precision instruments, which are expensive and bulky, and these seismic wave detection devices need to be installed and embedded in specific regions and depths. Therefore, the existing seismic monitoring system has defects such as large area occupation, high cost, and unfavorable popularization and use in large areas. [0003] Distributed optical fiber sensing has dual characteristics of sensing and signal transmission, and can realize continuous measurement distributed along the optical fiber. Compared with point sensors and quasi-distributed sensors, distributed optical fiber...

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Problems solved by technology

[0002] At present, seismic wave detection systems are mostly used in national professional institutions. Seismic wave detection devices are mostly precision instruments, which are expensive and bulky, and these seismic wave detection devices need to be installed and embedded in specific regions and depths

Therefore, the existing earthquake monitoring system has defects such as large area, high cost, and unfavorable promotion and use in large areas.

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