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Fiber optic interferometric velocity seismometer

delete2025-05-28
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PRE
AI
H
Huicong Li
W
Wenzhu Huang
L
Li, Li
DOI：10.1016/j.measurement.2025.117667delete
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Abstract

Abstract

En 中文
No fiber optic seismometers can directly measure ground velocity through their own passive optomechanical designs. We propose a fiber optic interferometric velocity seismometer (iVSeis) based on a cross-spring inverted pendulum and a differentiating Mach-Zehnder interferometer. iVSeis uses only the differentiating interferometer as a velocity sensor to record the ground velocity picked up by the cross-spring inverted pendulum, achieving a direct flat response to the ground velocity. To our knowledge, this is the first passive fiber optic velocity seismometer. An iVSeis prototype was developed and tested to have a constant sensitivity of 1,649.34 rad/(m/s), a linearity error better than 0.2 % @ 1 Hz, a self-noise close to Peterson's new low noise model (NLNM) within 0.2 Hz similar to 3 Hz, and a dynamic range of 145 dB @ 10 Hz. Moreover, iVSeis was successfully used to record natural earthquakes, confirming its ability to serve seismology.
Keywords:
Fiber optic sensor
Velocity seismometer
Inverted pendulum
Differentiating interferometer

Journal

Measurement cover
Measurement
IF:
5.6
Papers:
2.0W
Citations:
5.4W

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No organization information available