Sub-tau phase modulation

Details Sub-tau phase modulation Sub-tau phase modulation

H - Electricity

01

S

345/56

H01S 3/10 (2006.01) G01C 19/66 (2006.01) G01C 19/72 (2006.01)

Patent

CA 2009787

A method and apparatus are disclosed for closed-loop phase modulation to measure rate and control phase modulator gain errors in an electrical signal representing the phase difference between first and second light signals from lightwaves counterpropagating in an interferometric rotation sensor including a closed light path with a phase modulator in the path. The disclosed method and apparatus correct phase modulator gain in a way that is independent of rate.

Méthode et appareil de modulation de phase en boucle fermée, visant à mesurer la vitesse et les erreurs de gain de modulateur de phase de commande associées à un signal électrique représentant la différence de phase entre un premier et un second signaux d'ondes lumineuses qui se rétropropagent dans un capteur de rotation interférométrique comprenant un trajet lumineux fermé sur lequel un modulateur de phase est présent. La méthode et l'appareil présentés corrigent le gain de modulateur de phase indépendamment de la vitesse.

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