Patent ID: 6360611
Filing Date: 2002-03-26
Classification: B06B

Abstract:
A device for ultrasound radiation into a material comprising:a piezoelectric substrate having two end surfaces; a first input interdigital transducer; a second input interdigital transducer; an output interdigital transducer, all said first input-, said second input-, and said output interdigital transducers being formed on one end surface of said piezoelectric substrate; an amplifier; and a voltage controller, said first input interdigital transducer receiving an input electric signal and exciting a first elastic wave, composed of a leaky- and a non-leaky components, in said piezoelectric substrate, said output interdigital transducer detecting said non-leaky component of said first elastic wave as a delayed electric signal, said amplifier amplifying said delayed electric signal and feeding a signal part, as said input electric signal, of an amplified electric signal back to said first input interdigital transducer, again, said voltage controller controlling a voltage of a remaining signal part of said amplified electric signal, said second input interdigital transducer receiving said remaining signal part, exciting a second elastic wave, composed of a leaky- and a non-leaky components, in said piezoelectric substrate, and radiating said leaky component of said second elastic wave in the form of a longitudinal wave, by an intensity corresponding to said voltage of said remaining signal part, into a material through the other end surface of said piezoelectric substrate.