1. The Development of a New IFOG-Based 3C Rotational Seismometer
- Author
-
Dong He, Chen Yanjun, Yang Chunxia, Tong Zhou, Zhengbin Li, Cao Yuwen, Zhang Dingfan, Zhu Lanxin, Yujia Cao, and Zeng Weiyi
- Subjects
Seismometer ,010504 meteorology & atmospheric sciences ,fiber optic gyroscope ,Acoustics ,rotational seismometer ,TP1-1185 ,010502 geochemistry & geophysics ,Rotation ,01 natural sciences ,Biochemistry ,Analytical Chemistry ,Acceleration ,Electrical and Electronic Engineering ,Instrumentation ,0105 earth and related environmental sciences ,Physics ,Sagnac effect ,Communication ,Chemical technology ,Fibre optic gyroscope ,Scale factor ,Atomic and Molecular Physics, and Optics ,Interferometry ,three-component ,Harmonics ,sagnac effect - Abstract
For many years, seismological research mainly focuses on translational ground motions due to the lack of appropriate sensors. However, because of the development of devices based on Sagnac effect, measuring rotational waves directly comes available. In this work, a portable three-component broadband rotational seismometer named RotSensor3C based on open loop interferometric fiber optic gyroscope (IFOG) is designed and demonstrated. Laboratory tests and results are illustrated in detail. The self-noise ranging from 0.005 Hz to 125 Hz is about 1.2×10−7rads−1/Hz, and with the harmonics compensation the scale factor variation over ±250∘/s is lower than 10 ppm (parts per million). The misalignment matrix method is adopted to revise the output rotation rate. In a special near field experiment using the explosive source, the back-azimuths and phase velocity are estimated by the recorded acceleration and rotation rate. All the results prove the practicability of this new rotational sensor.
- Published
- 2021