Ultrasonic transducer with improved transient response and method for utilizing transducer to increase accuracy of measurement of an ultrasonic flow meter

摘要

An ultrasonic transducer employs a ceramic disc which, when excited by a d-c pulse, vibrates in its planar resonant frequency mode. The sensitivity is selectively increased for the second positive half cycle of the transient oscillation of the disc and a method is described for using the selectively improved transient response to greatly increase the precision of measurement of the time interval for a transient pulse of ultrasonic energy to travel the distance between an ultrasonic transmitter and an ultrasonic receiver.