THE SENSITIVITY ESTIMATION FOR THE ULTRASONIC ANGULAR VELOCITY SENSORS

Abstract

The paper discusses the principles of the occurrence of inherent noise of the sensitive element of the angular velocity sensor, the calculation of these noises and methods of their reduction. The principle of operation of the sensing element of the angular velocity sensor on bulk acoustic waves, which consists in detecting the rotation of the polarization vector of the emitted linearly polarized shear wave, is presented in the work. The results of calculations of the noise level for various materials and sizes of plate piezoelectric transducers and acoustic duct are presented in the work. It is shown that a sensitive element with plate piezoelectric transducers made of langasite and an acoustic duct made of glass, a heavy flint, has a minimum noise level. It is shown that with an increase in the operating frequency of a plate piezoelectric transducer, the noise level decreases. A program for calculating the noise characteristics of solid-state angular velocity sensors based on bulk acoustic waves has been developed. The element base of the receiving amplifier of the device has been selected. Recommendations for reducing the level of noise are formulated, such as: increasing the operating frequency and reducing the bandwidth of plate piezoelectric transducers, as well as the choice of optimal materials for both piezoelectric transducers and acoustic duсt.