Abstract

This paper presents a method for frequency-response evaluation of ultrasonic probes in air. It mainly consists of propagating a non-linear plane acoustic wave in a waveguide and in measuring its harmonics content by alternately using a reference probe and the probe to be calibrated. From the comparison between both measurements, the sensitivity of the unknown probe can be determined over a wide frequency band. The principal advantages of this method are the simplicity of the experimental set-up and the rapidity in the determination of the probe sensitivity for a certain number of frequencies. The method has been implemented for the frequency range of approximately 20 to 190 kHz in an air-filled tube. © 1998 Elsevier Science S.A. All rights reserved.