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Sensors 2018, 18(3), 696; https://doi.org/10.3390/s18030696

Analysis of Resonance Asymmetry Phenomenon in Resonant Fiber Optic Gyro

1,2
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1,2
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2
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2
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3,* and 1,3,*
1
Sino-German College for Intelligent Manufacturing, Shenzhen Technology University, Shenzhen 518060, China
2
Guangdong Provincial Key Laboratory of Micro/Nano Optomechatronics Engineering, College of Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
3
Guangdong Provincial Key Laboratory of Micro/Nano Optomechatronics Engineering, College of Mechatronics and Control Engineering, Shenzhen University, Shenzhen 518060, China
*
Authors to whom correspondence should be addressed.
Received: 14 January 2018 / Revised: 17 February 2018 / Accepted: 17 February 2018 / Published: 26 February 2018
(This article belongs to the Section Physical Sensors)
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Abstract

This experiment demonstrated the resonance asymmetry phenomenon in the resonant fiber optic gyro. The asymmetry of resonant curve affects the system open-loop bias and its stability, which directly affects the accuracy of angular velocity measurement. In this paper, a new mathematic model is established. The influence of the coupler normal mode loss difference (the phase difference between the coupler cross port output optical field and direct port is less than the ideal π/2) on the symmetry of resonant curve, the resonant signal modulated by the triangular wave, and the demodulation curve are analyzed. Moreover, the asymmetry of the resonant curve leads to the asymmetry of the resonant signal, as modulated by the triangular wave and the demodulation curve from the theoretical simulation and the experiment. View Full-Text
Keywords: resonant fiber optic gyro; normal mode loss difference; resonance asymmetry resonant fiber optic gyro; normal mode loss difference; resonance asymmetry
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Li, Z.; He, N.; Sun, X.; Jin, C.; Liu, C.; Wu, X. Analysis of Resonance Asymmetry Phenomenon in Resonant Fiber Optic Gyro. Sensors 2018, 18, 696.

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