Optical Sensors

Method to control the gain in modulation chain of closed-loop fiber optic gyroscope with periodical biasing modulation

[+] Author Affiliations
Wei Wang

China Academy of Aerospace Electronics Technology, No. 1 Fengying East Road, Haidian, Beijing 100094, China

Junlong Wang, Zhengxin Zhao

China Academy of Aerospace Electronics Technology, No. 1 Fengying East Road, Haidian, Beijing 100094, China

Opt. Eng. 51(6), 064401 (Jun 11, 2012). doi:10.1117/1.OE.51.6.064401
History: Received February 15, 2012; Revised May 1, 2012; Accepted May 15, 2012
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Abstract.  Both methods to control the gain in the modulation chain of interferometric fiber optic gyroscope (IFOG) are analyzed: One is based on the square wave biasing modulation, and the other is based on the four-state wave biasing modulation. The analysis results indicate that the method based on square wave is less efficient at low angular rate because of long reset time, and the method based on four-state wave may give the wrong or reverse gain error at high angular rate because of frequent resets. To eliminate the limitation of the existing methods, a novel demodulation method of the gain in the modulation chain based on periodical biasing modulation is proposed. This method is independent of the 2π phase ramp resets and the input angular rate. Experimental results indicate that the method effectively improves the scale factor stability and linearity of closed-loop IFOG.

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© 2012 Society of Photo-Optical Instrumentation Engineers

Citation

Wei Wang ; Junlong Wang and Zhengxin Zhao
"Method to control the gain in modulation chain of closed-loop fiber optic gyroscope with periodical biasing modulation", Opt. Eng. 51(6), 064401 (Jun 11, 2012). ; http://dx.doi.org/10.1117/1.OE.51.6.064401


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