J. Phys. IV France 128 (2005) 201-205
Interest of using piezoelectric single crystals with high electromechanical coupling factor in Coriolis Vibrating GyrosA. Parent, S. Masson and O. Le Traon
ONERA, Physics, Instrumentation and Sensing Department, Sensors and Microtechnology Unit, BP. 72, 29 avenue de la Division Leclerc, 92322 Châtillon Cedex, France
In piezoelectric Coriolis Vibrating Gyros piezoelectricity is both used to excite the in plane reference vibration and to detect the out of plane vibration induced by an input angular rate. Quartz crystal is used because of its good mechanical properties (e.g. high quality factor... ). In this paper, the opportunity of using new piezoelectric crystals with high electromechanical coupling factor is studied. An analytical model of a piezoelectric beam CVG has been established in the case of high piezoelectric coupling. This model predicts an improvement by a factor 50 of the gyro resolution by using the ferroelectric single crystal PMN-0.34PT instead of quartz.
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