The Development of a New IFOG-Based 3C Rotational Seismometer

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...

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Bibliographic Details
Published in:Sensors (Basel, Switzerland) Switzerland), 2021-06, Vol.21 (11), p.3899
Main Authors: Cao, Yuwen, Chen, Yanjun, Zhou, Tong, Yang, Chunxia, Zhu, Lanxin, Zhang, Dingfan, Cao, Yujia, Zeng, Weiyi, He, Dong, Li, Zhengbin
Format: Article
Language:English
Subjects:
Acceleration
Broadband
Communication
Earthquakes
fiber optic gyroscope
Ground motion
Interferometric fiber optic gyroscopes
Laboratories
Light
Misalignment
Noise
Phase velocity
Rotation
rotational seismometer
Sagnac effect
Seismic engineering
Seismographs
Seismology
Sensors
three-component
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Summary: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.
ISSN:1424-8220
1424-8220
DOI:10.3390/s21113899