Verfahren zum nachtraeglichen Abgleichen der Laufzeit von elektroakustischen Verzoegerungsleitungen auf piezoelektrischen Keramiksubstraten

摘要

A method for adjusting or varying the transit time between input and output transducers disposed on a piezo-electric substrate of a polarized ceramic by applying an electrical field in a direction opposed to the residual polarization to decrease the residual polarization or with the direction of residual polarization to increase the residual polarization to cause corresponding changes in the modulus of elasticity of the substrate and thus the speed of propagation of a surface wave between the input and output electrodes.