Fiber optic gyroscope

G - Physics – 01 – C

Patent

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G01C 19/72 (2006.01)

Patent

CA 2316890

An apparatus for eliminating or reducing vibration-induced errors due to vibration rectification by applying a variable weighting function at the demodulator or analog-to-digital converter by changing the size of the demodulator reference signal or the converter gain, respectively. The changing is performed within the frequency spectrum of the vibration. Sampling of the detector output may be utilized and the samples are accumulated and processed to remove the variations due to vibration, and the rotation rate is recovered by digital demodulation.

L'invention concerne un appareil d'élimination ou de réduction des erreurs induites par la vibration lors de la rectification de la vibration par l'application d'une fonction de pondération variable au niveau du démodulateur ou du convertisseur analogique-numérique par la modification de la taille du signal de référence du démodulateur ou du gain du convertisseur. La modification a lieu dans le spectre de fréquences de la vibration. On peut utiliser l'échantillonnage de la valeur de sortie du détecteur et accumuler et traiter les échantillons de manière à éliminer les variations dues à la vibration. On retrouve ainsi la vitesse de rotation par démodulation numérique.

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