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Open loop fibre optic gyroscope with phase shift nulling signal processing

Open loop fibre optic gyroscope with phase shift nulling signal processing

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A simple analogue phase tracking circuit for the fibre gyroscope is described. The system provides a linear output from an open loop gyroscope configuration over a range in Sagnac phase shift >±500° Sagnac, with good linearity and relatively low noise and drift. The use of this demodulator in low-cost medium grade fibre gyroscope applications is projected.

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