Compact three-frequency resonant optical gyroscope

US10371524B2 · kind B2 · utility

Assignees

• THALES · FR
• CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE · FR
• Ecole Normale Superieure De Cachan · FR

Inventors

• Sylvain Schwartz · Paris, FR
• Gilles Feugnet · Les Ulis, FR
• Arnaud Brignon · Bourg-la-Reine, FR
• Fabien Bretenaker · Vélizy-Villacoublay, FR

Key dates

• Filing date: Apr 5, 2017
• Grant date: Aug 6, 2019
• Expiry date: Aug 2, 2037

Classification

• Technology area (CPC G): Physics
• CPC primary: G01C19/727
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A passive resonant optical gyroscope comprising a cavity and operating with three frequencies comprises: a first injecting laser to inject a first optical beam into the cavity in a first direction; a second injecting laser to inject a second optical beam into the cavity in an opposite direction; a third injecting laser to inject a third optical beam into the cavity in one of the aforementioned directions, one laser amongst the injecting lasers having a master frequency, the two other injecting lasers, called the first and second slave lasers, respectively having a first slave frequency and a second slave frequency; a master servocontrol device; a first servocontrol stage comprising first and second slave devices; and a second servocontrol stage comprising first and second optical phase-locking devices respectively comprising a first and second slave oscillator to generate a first radiofrequency offset signal and a second radiofrequency offset signal.