Temperature self-compensated lithium tantalate piezoelectric gyroscope forhigher stability

We are studying the flexura H-type vibrational gyroscope using a LiTiO3 sin gle crystal with large electromechanical coupling coefficients. The H-type LiTaO3 piezoelectric gyroscope sharply suppresses leakage output. As a resu lt, temperature characteristics of drift and sensitivity can he calculated using an equivalent circuit deduced from the experiment. The resonant frequ ency and Q-value of the X mode are stable with the temperature. However, th e resonant frequency and the Q-value of the Z mode show complicated fluctua tions with temperature due to the effects of the support and other factors. As a countermeasure, the possibilities of applying an automatic temperatur e characteristic compensation method with the monitor transducer in the dri ve mode of operating in nonresonant drive and resonant detection were studi ed. By adding a new monitor that detects the vibrational mode of the drive, we can establish a stable reference signal for the synchronous detection o f output. It is possible to greatly improve the temperature characteristics of sensitivity and drift.