Backscatter error reducer for interferometric fiber optic...

G - Physics – 01 – C

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G01C 19/72 (2006.01)

Patent

CA 2265594

A backscatter or secondary wave error reducer for an interferometric fiber optic gyroscope having at least one phase modulator for receiving a square wave bias phase modulation signal and a sine wave carrier suppression modulation signal. The amplitude of the carrier suppression modulation signal is sufficient to greatly reduce the interference between two sets of backscattered or secondary waves of light originating in the Sagnac loop of the gyroscope. Reduction or elimination of the interference of the two sets of secondary waves reduces or eliminates the secondary wave induced rotation rate sensing error. The frequency of the carrier suppression signal is near or equal to an even harmonic of the proper frequency of the Sagnac loop to reduce the simusoidal or periodic rotation rate sensing error caused by the carrier suppression modulation signal.

L'invention concerne un dispositif de réduction d'erreurs d'ondes secondaires ou de rétrodiffusion destiné à un gyroscope à fibre optique interférométrique comprenant au moins un modulateur de phase permettant de recevoir un signal de modulation de tension de polarisation en onde carrée et un signal de modulation de suppression d'onde porteuse sinusoïdale. L'amplitude du signal de modulation de suppression d'onde porteuse est suffisante pour réduire de manière significative l'interférence entre deux séries d'ondes lumineuses secondaires ou de rétrodiffusion provenant de la boucle de Sagnac du gyroscope. La réduction ou l'élimination de l'interférence entre les deux séries d'ondes secondaires permet de réduire ou d'éliminer une erreur de détection de vitesse de rotation induite par l'onde secondaire. La fréquence du signal de suppression de la porteuse est proche d'un harmonique pair de la fréquence propre de la boucle de Sagnac, ou égale à cet harmonique, pour réduire l'erreur de détection de vitesse de rotation périodique ou sinusoïdale provoquée par le signal de modulation de suppression d'onde porteuse.

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