Square beam type piezo-electric vibrating gyro is developed for measurement of angular velocity, which is compact, small in size and mass-producible. It features that three pieces of piezo-electric ceramic are bonded onto one face of equilateral square bar type gyro head. Two of them are used as sentuators which drive the gyro head and measure Coriolis force. The third piece is used for the feedback signal in order to resonate the gyro head with its fundamental natural frequency. Matching two fundamental natural frequencies in the gyro head with its driving frequency is found critical in design of vibrating gyro. Calibration results show that the vibrating gyro developed has the dynamic characteristics of a first-order system within the frequency range of interest, which can be easily compensated by a lead compensator.
