High power piezoelectric beam generating system with acoustic impedance matching

Claim 1

IN A GENERATOR FOR TRANSMITTING AN ACOUSTC WAVE INTO A FLUID MEDIUM, AN ELECTROMECHANICAL TRANSDUCER HAVING A VIBRATORY SURFACE, MATCHING MEANS HAVING ONE FACE ENGAGED WITH SAID SURFACE AND AN OPPOSITE FACE ENGAGED WITH SAID LIQUID MEDIUM ARRANGED TO PRODUCE A LARGE VIBRATORY MOVEMENT OF SAID OPPOSITE FACE IN RESPONSE TO A SMALL AMPLITUDE ELECTRIC DRIVING FUNCTION APPLIED TO THE TRANSDUCER AS COMPARED TO THE CONFIGURATION WHEREIN THE ELECTROMECHANICAL TRANSDUCER IS IN DIRECT CONTACT WITH THE SAID FLUID MEDIUM, AND MEANS FOR OPERATING SAID GENERATOR IN A HIGH PRESSURE FLUID MEDIUM TO APPLY UNIFORM COMPRESSION THERETO, SAID MATCHING MEANS INCLUDING A FIRST SECTION DEFINING SAID OPPOSITE FACE AND HAVING A HIGH CHARACTERISTIC ACOUSTIC IMPEDANCE COMPARED TO THE CHARACTERISTIC ACOUSTIC IMPEDANCE OF THE FLUID MEDIUM AND A SECOND SECTION BETWEEN SAID FIRST SECTION AND SAID TRANSDUCER HAVING A LOWER CHARACTERISTIC IMPEDANCE THAN THAT OF SAID FIRST SECTION.