New Technique for the Implementation of Digital Demodulation in Fiber Optic Gyroscopes

Abstract. This paper describes a new technique for the demodulation of Sagnac fiber optic gyroscopes, based on the zero-crossing technique. The technique uses a digital approach with a quasi-synchronous clock, which allows for the implementation of very high resolution and low cost gyroscope demodulation circuits. The proposed demodulation circuit was tested in laboratory, using a emulated gyroscope signal. The experimental results measured in the prototype showed that the final resolution of the detection scheme is 1000 times better than the resolution possible to achieve in the conventional synchronous clock zero-crossing digital demodulator.