Ultrasonic delay lines and method of making the same

摘要

A multiple reflection type solid ultrasonic delay line which comprises a solid ultrasonic delay medium in the form of a thin flat plate having input and output transducers and reflection elements formed on the periphery thereof, and one or more arc grooves provided on part of side surfaces which is other than desirable reflection elements for ultrasonic vibration and a low melting metal or alloy being provided in said arc grooves. In the delay lines, undesirable signals are remarkably attenuated.