Multipurpose piezoelectric transducer system

Claim 1

A TRANSDUCING SYSTEM COMPRISING: TRANSDUCER MEANS HAVING FIRST AND SECOND PIEZOELECTRIC ELEMENTS MOUNTED FOR RESPONSE TO DIFFERENT INPUT SIGNAL PARAMETERS, AT LEAST TWO OF WHICH PARAMETERS ARE TO BE UTILIZED; SAID PIEZOELECTRIC ELEMENTS HAVING ESSENTIALLY IDENTICAL PIEZOELECTRIC CONSTANTS AND CAPACITIES; TRANSDUCER OUTPUT PATH MEANS CONNECTED TO EACH OF SAID PIEZOELECTRIC ELEMENTS FOR PROVIDING OUTPUT SIGNALS FROM SAID FIRST ELEMENT 180* OUT OF PHASE WITH OUTPUT SIGNALS FROM SAID SECOND ELEMENT; AND SUM AND DIFFERENCE OUTPUT SIGNAL-PRODUCING CIRCUIT MEANS HAVING A FIRST OUTPUT CONSTITUTING A SUM OUTPUT AND A SECOND OUTPUT CONSTITUTING A DIFFERENCE OUTPUT, INCLUDING MEANS FOR EQUALIZING THE AMPLITUDES OF SAID OUTPUT SIGNALS, CONNECTED TO SAID OUTPUT PATH MEANS FOR PRODUCING ONE SYSTEM OUTPUT MEASUJREMENT SIGNAL CORRESPONDING TO SAID AT LEAST ONE INPUT SIGNAL PARAMETER, WHEREBY THE OUTPUT MEASUREMENT SIGNAL IS UNAFFECTED BY THE OTHER RECEIVED INPUT SIGNAL PARAMETER.