Modulation frequency control in a fiber optic rotation sensor

Details Modulation frequency control in a fiber optic rotation sensor Modulation frequency control in a fiber optic rotation sensor

G - Physics

01

C

G01C 19/72 (2006.01)

Patent

CA 2084502

In a fiber optic rotation sensor having a pair of light waves counter- propagating in an optical waveguide loop, a phase modulator is driven by a modulating signal at the loop eigenfrequency. Upon exiting the loop the waves are combined into a light intensity signal which is sensed, the sensed signal including a component in quadrature with a desired rotation rate component, the magnitude of the quadrature component being proportional to any deviations in the frequency of the modulating signal from the loop eigenfrequency. The phase modulator is servo-controlled so as to drive the quadrature component to zero, thereby compensating for any deviations in the modulator frequency from the loop eigenfrequency.

Dans un détecteur de rotation à fibre optique possédant une paire de faisceaux lumineux en contre-propagation dans une boucle de guides d'ondes optiques, un modulateur de phase est commandé par un signal de modulation à la fréquence propre de la boucle. Lorsquelles quittent la boucle, les ondes se rassemblent pour former un signal d'intensité lumineuse qui est détecté. Le signal détecté comporte un élément en quadrature avec un élément de vitesse de rotation voulue, et l'ampleur de l'élément en quadrature est proportionnelle aux déviations quelconques de la fréquence du signal de modulation de la fréquence propre de la boucle. Le modulateur de phase est servocommandé de sorte que l'élément en quadrature soit remis à zéro, ce qui compense les déviations quelconques de la fréquence du modulateur de la fréquence propre de la boucle.

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