Patent ID: 6640636
Filing Date: 2003-11-04
Classification: G01N

Abstract:
An ultrasound radiating and receiving device comprising:a piezoelectric substrate; a first comb-shaped electrode formed on an upper end surface of said piezoelectric substrate; a second comb-shaped electrode formed on said upper end surface of said piezoelectric substrate; and a counter electrode formed on a lower end surface of said piezoelectric substrate and in contact with a surface-part of a material through the lower end surface of said counter electrode, said first- and second comb-shaped electrodes forming an interdigital arrangement, said first comb-shaped electrode and said counter electrode receiving an input electric signal, radiating a longitudinal wave into said material through said surface-part of said material along the direction vertical to said lower end surface of said piezoelectric substrate, and making an object located inside said material reflect said longitudinal wave back, said second comb-shaped electrode and said counter electrode detecting a reflected longitudinal wave as a delayed electric signal.