Differential Michelson optical fiber interference sensing seismic detector

Abstract

The invention discloses a differential Michelson optical fiber interference sensing seismic detector,and relates to the field of optical fiber sensing technology. The differential Michelson optical fiber interference sensing seismic detector comprises a narrow linewidth laser,a first photodetector,a second photodetector,a 1X2 coupler,and a first 2X2 coupler and a second 2X2 coupler and further includes a support shaft,a mass body,a first fiber ring,a second fiber ring,a first Faraday fiber mirror,a second Faraday fiber mirror,a third Faraday fiber mirror,and a four Faraday fiber optic mirror.The differential Michelson optical fiber interference sensing seismic detector not only has the advantages of simple structure,good economy,but also has the advantages of quick response and strong reliability,and has a broad application prospect in advance forecasting and petroleum surveying.

Description

technical field [0001] The invention relates to the technical field of optical fiber sensing, in particular to a differential Michelson optical fiber interference sensing geophone. Background technique [0002] With the development of seismic exploration technology, especially the deepening of high-resolution exploration, the requirements for the accuracy and quality of seismic exploration data collection are getting higher and higher, and the collected data is required to have broadband, high fidelity, high signal-to-noise ratio, and high dynamics. In order to better identify geological structure, lithology, fluid, and fractured reservoirs, improve reservoir location, reservoir characteristics, description of reservoir connectivity, and enhanced recovery. As one of the key components of field data acquisition, the performance of the geophone is directly related to the quality of the collected data and the effect of geological analysis. [0003] In conventional reflection s...

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Problems solved by technology

[0005] The permanent magnet of the electromagnetic induction geophone is greatly affected by temperature and geomagnetism, is easily oxidized and has an unstable magnetic field, so the geophone has low sensitivity, poor stability and repeatability

The on-site workload is heavy, there are many natural frequency selections, a large number of geophone combinations are required, the arrangement is complex, and the intensity is high

In the actual detection work, geological prospecting personnel need to carry a large amount of measuring equipment, especially when laying out the detector array, the heavy cables and numerous detectors are unbearable

The detection location is often in the deep mountains and forests, and the workload is heavy. At the same time, the detector cable is easily disturbed by the external electromagnetic field, which affects the reliability of the data.

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