Six-dimensional seismic wave measuring device based on composite interferometer

Abstract

The invention provides a six-dimensional seismic wave measuring device based on a composite interferometer. The device comprises an optical fiber sensing shell 12, a sensing module 13, a composite interferometer 14 and a photoelectric conversion module 15, a data acquisition processing module 16; a light path of the composite interferometer 14 mainly comprises light source input; a circulator 143,couplers 144, 146, 147, 148, 148, 149, 149. a polarizer 142, a wavelength division multiplexer 145. A Mach-Zehnder interferometer and Sagnac interferometer composite optical structure is adopted, theinfluence of temperature on measurement is eliminated through double polarization maintaining optical paths, six-dimensional measurement of seismic waves is achieved through a mandrel type integratedstructure, and the miniaturization design of the optical fiber seismometer is achieved.

Description

technical field [0001] The invention relates to a seismic wave measuring device, in particular to a seismic wave measuring device based on an optical fiber interferometer. Background technique [0002] Seismic observation is a frontier field related to the safety of people’s property. The traditional understanding of earthquakes is based on the elastic model, and it is believed that seismic waves are transverse waves. With the continuous development of seismic observation technology, modern earthquake theory believes that seismic waves include not only translational components, but also Therefore, to completely describe and analyze the deformation information of geological structures caused by earthquakes, it is necessary to obtain accurate, fine, and real full-dimensional seismic wave information. The rotating seismic wave can provide not only the observation information of deep earthquakes, but also the complete real waveform information of near-field earthquakes. It can o...

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Problems solved by technology

Such as an ultra-short baseline conformal column structure optical fiber displacement sensor and optical fiber strain gauge (CN201210381978.8); a short baseline differential laser strain gauge (CN201210381976.9); an ultrashort baseline differential disc optical fiber displacement sensor and Optical fiber strain gauge (CN201210381977.3); two-dimensional high-precision combined interference fiber integrated accelerometer (CN101865935A); a rotational seismic wave measurement device based on a composite interferometer (CN106125131 A); a simultaneous measurement of axial acceleration and horizontal rotation Optical fiber sensing device (CN106643836 A) etc. of angular velocity, set forth how to utilize Michelson interferometer to measure the strain that seismic wave produces in above patent document, axial acceleration, its strain measurement resolution (10 -11 ~10 -12 ε), the dynamic range is greater than 180dB, but it is easily affected by temperature interference, which affects the measurement accuracy

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