Evaluation of vibrations of acoustic spherical antenna by laser interferometer

Abstract

The estimation of propagation of flexural waves on ultrasonic transducer’s surface by laser interferometer is described. The home made laser interferometer is used for measurements of vibrations distribution along the radii of parabolic antenna. One period electrical excitation signal is used for excitation of flexural vibrations in the acoustic antenna, along antenna’s radius. The time of the first peak of displacement and the second peak of displacement in different points along antenna’s radius is analyzed.
The measurements of distribution of front acoustic wave propagation to target in air and reflected wave can be planned after evaluation of reliability of information obtained by laser technique.
These results are very important in design of new piezoelectrical antennas for measurements in gaseous environment.