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Rotating seismic wave measurement device based on composite interferometer

A technology of measuring device and interferometer, which is applied in the direction of measuring device, geophysical measurement, seismology, etc., to achieve the effect of small size, large output dynamic range and functional expansion.

Active Publication Date: 2016-11-16
HARBIN ENG UNIV
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Problems solved by technology

Since then, many journals have published other rotational component estimation methods developed in elastic medium mechanics. The above research results show that the rotational component may have a non-negligible impact on the seismic response of some structures

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  • Rotating seismic wave measurement device based on composite interferometer
  • Rotating seismic wave measurement device based on composite interferometer
  • Rotating seismic wave measurement device based on composite interferometer

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Embodiment Construction

[0019] The present invention will be further described below in conjunction with the accompanying drawings.

[0020] The invention provides a rotating seismic wave measuring device based on a composite interferometer, and the sensing device is composed of a Michelson interferometer and a Sagnac interferometer. Among them, the two sensing arms of the Michelson interferometer are spliced ​​into the sensing fiber ring of the Sagnac interferometer, and the different components of the optical path of the same input light source are used as two sets of interferometers by using the spectral characteristics of the distributed Bragg grating. Controlling the arm length difference of the Michelson interferometer ensures the normal operation of the interferometer. The device can effectively measure the rotational angular velocity and axial acceleration simultaneously, and has broad application prospects in the fields of rotational seismic wave measurement and the like.

[0021] Optical m...

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Abstract

The invention belongs to the field of fiber interferometer measurement, and specifically relates to a rotating seismic wave measurement device based on a composite interferometer. The device comprises a fiber sensing probe 10, the composite interferometer 20, and peripheral equipment. In the composite interferometer 20, an input light source 204 is connected to a port a of a second circulator 212, and a port b of the second circulator 212 is connected to a port a of a first circulator 211. A port b of the first circulator 211 is connected to a first optical grating 221, and then is connected to a second detector 202. A port c of the first circulator 211 is connected to a first detector 201. The device employs an optical path multiplexing structure to enable a Michelson interferometer and a Sagnac interferometer to share a light source and a sensing arm, and reduces the system manufacture cost.

Description

technical field [0001] The invention belongs to the field of optical fiber interferometer measurement, and in particular relates to a rotating seismic wave measurement device based on a compound interferometer. Background technique [0002] Seismic surveying is a frontier surveying field related to the safety of people's property and the stable development of the country. Seismic measurement technology has a history of thousands of years since Zhang Heng invented the seismograph. Seismic measurement methods have become more and more abundant, and earthquake theoretical models have become more and more complete. Modern seismometry believes that the motion of the earth medium caused by earthquakes is no longer a common plane activity, but a complex multi-dimensional motion, which not only includes three independent translational components, but also three independent rotation component. The previous literature has been devoted to how to record and analyze the displacement in...

Claims

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Application Information

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IPC IPC(8): G01V1/18
CPCG01V1/181
Inventor 彭峰侯璐杨军苑勇贵吴冰
Owner HARBIN ENG UNIV
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