Sensitivity-enhanced fiber optic gyroscope for rotational seismology

Wenbo Wang; Lanxin Zhu; Yan He; Yanjun Chen; Huimin Huang; Xinyu Cao; Fangshuo Shi; Zhengbin Li

doi:10.1117/12.3023330

18 March 2024 Sensitivity-enhanced fiber optic gyroscope for rotational seismology

Wenbo Wang, Lanxin Zhu, Yan He, Yanjun Chen, Huimin Huang, Xinyu Cao, Fangshuo Shi, Zhengbin Li

Proceedings Volume 13104, Advanced Fiber Laser Conference (AFL2023); 1310433 (2024) https://doi.org/10.1117/12.3023330
Event: Advanced Fiber Laser Conference (AFL2023), 2023, Shenzhen, China

Abstract

The measurement of rotational components in seismic waves holds significant importance in various fields, including seismic early warning, subsurface structure inversion, and the study of Earth's internal dynamic processes. The interferometric fiber optic gyroscope (IFOG) is a kind of sensor that measures the rotational velocity of an object based on the Sagnac effect. In this study, a synchronous four-state modulation scheme based on a light source sharing configuration is employed to suppress RIN. Moreover, this work extensively investigates the impact of shot noise and Johnson-Nyquist noise. By adjusting the modulation depths of the two minimum configurations, the influence of shot noise and Johnson-Nyquist noise is well-handled while achieving RIN suppression. Furthermore, this scheme avoids introducing any external feedback, thereby preventing a decrease in sensitivity caused by the dead zone issue. In a test on detecting the rotation rate of the Earth, a self-noise level of 55 nrad/s/Hz^1/2 and an angular random walk of 1.5 × 10⁻⁴ deg/h^1/2 are achieved with an enclosed area of only 25.5 m². Compared to the minimum configuration using the conventional phase generated carrier algorithm, the scheme realizes a 20-fold reduction in self-noise and an 18- fold reduction in angular random walk.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Wenbo Wang, Lanxin Zhu, Yan He, Yanjun Chen, Huimin Huang, Xinyu Cao, Fangshuo Shi, and Zhengbin Li "Sensitivity-enhanced fiber optic gyroscope for rotational seismology", Proc. SPIE 13104, Advanced Fiber Laser Conference (AFL2023), 1310433 (18 March 2024); https://doi.org/10.1117/12.3023330

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KEYWORDS

Relative intensity noise

Modulation

Fiber optic gyroscopes

Light sources

Signal detection

Polarized light

Sensors

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