New technique for the implementation of digital demodulation of fiber optic gyroscopes / Implementação de uma nova tecnica para demodulação digital de sinal de giroscopio a fibra optica

AUTOR(ES)
DATA DE PUBLICAÇÃO

2009

RESUMO

Gyroscopes are devices used to measure angular orientation, being extensively employed for guidance, navigation and stabilization. Among the many types of gyroscopes, IFOG (Interferometer Fiber Optic Gyroscope), based on Sagnac effect, is the most interesting solution due to its high sensitivity, resolution, reliability, small size and EMI immunity. The present work describes a digital electronic circuit implementation for open-loop IFOGs using zero-crossing demodulation techniques. The technique used in the electronic circuit described in this work employs a quasi-synchronous clock for signal processing which leads to an accurate, simple and low cost digital demodulation scheme. The experimental results of the prototype showed that the final detection resolution is 1000 times better than one achieved by the conventional synchronous clock zero-crossing digital demodulator.

ASSUNTO(S)

giroscopios oticos detectores oticos signal processing moduladores (eletronica) optical detectors optics gyroscopes detecção de sinais processamento de sinais signal detection modulators (eletronics)

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