Development of Powerful Airborne Ultrasonic Transmitter for Robot Metrology

Abstract

An airborne ultrasonic transmitter which uses an electric spark discharge was developed for robot metrology. By inserting a condenser of a few hundred picofarads to the secondary side of an ignition coil in the electric circuit of the transmitter, the sound pressure of the radiated ultrasonic pulse becomes about ten times as strong as the case in which the condenser is not inserted. An ultrasonic ranging system which uses this transmitter was also developed.