GYROSCOPE WITH SURFACE ACOUSTIC WAVE AND ANGULAR VELOCITY MEASURING METHOD

摘要

PURPOSE: A gyroscope using a surface elastic wave and an angular velocity measuring method are provided to enhance the durability and the shock resistance using an elastic wave travelling along the surface of a piezoelectric material. CONSTITUTION: A gyroscope using a surface elastic wave comprises a resonator(200), a sensing oscillator(210), a reference oscillator(220), and a measuring circuit. The resonator generates a first surface elastic wave, produces the Coriolis force by the interaction of the applied angular velocity and the velocity component of the first wave at a Metallic dot layer(230) placed on a given location and a second surface elastic wave is generated by the Coriolis force. The sensing oscillator generates a third surface elastic wave and generates an interferential wave by the interference of the third wave and the second wave. The reference oscillator has the same structure to the sensing oscillator and generates a fourth surface elastic wave equal to the third wave. The measuring circuit measures the frequency difference between the interferential wave and the fourth wave to measure the magnitude of the applied angular velocity.