Transducer

Claim 1

AN ELECTROMECHANICAL DEVICE COMPRISING A PAIR OF THIN STRIPS OF PIEZOELECTRIC CERAMIC, A FIRST METAL STRIP, AN ELECTRODE APPLIED TO EACH SURFACE OF EACH OF SAID THIN STRIPS OF PIEZOELECTRIC CERAMIC, SAID THIN STRIPS OF PIEZOELECTRIC CERAMIC BEING AFFIXED TO SAID FIRST METAL STRIP SUCH THAT ELECTRICAL AND MECHANICAL CONTACT IS MADE BETWEEN AN ELECTRODE ON EACH OF SAID THIN STRIPS OF PIEZOELECTRIC CERAMIC AND SAID FIRST METAL STRIP, A PAIR OF THIN STRIPS OF PIEZORESISTIVE MATERIAL, A PAIR OF ELECTRODES APPLIED TO EACH OF SAID THIN STRIPS OF PIEZORESISTIVE MATERIAL, A SECOND METAL STRIP, SAID THIN STRIPS OF PIEZORESISTIVE MATERIAL BEING AFFIXED TO EACH SURFACE OF SAID SECOND METAL STRIP SUCH THAT SAID SECOND METAL STRIP, IS MOUNTED BETWEEN SAID THIN STRIPS OF PIEZORESISTIVE MATERIAL, ONE OUTER SURFACE OF ONE OF SAID THIN STRIPS OF PIEZOELECTRIC CERAMIC BEING AFFIXED TO ONE OUTER SURFACE OF ONE OF SAID THIN STRIPS OF PIEZORESISTIVE MATERIAL, MEANS FOR MAKING ELECTRICAL CONNECTION TO THE ELECTRODES, APPLIED TO SAID THIN STRIPS OF PIEZOELECTRIC CERAMIC, MEANS FOR MAKING ELECTRICAL CONNECTION TO THE ELECTRODES APPLIED TO SAID THIN STRIPS OF PIESORESISTIVE MATERIAL, MEANS FOR APPLYING MECHANICAL STRESS TO THE COMBINATION, A FIRST AMPLIFIER CONNECTED TO THE ELECTRODES APPLIED TO SAID THIN STRIPS OF PIEZOELECTRIC CERAMIC, A SOURCE OF VOLTAGE, A FIRST RESISTOR, A SECOND RESISTOR AND A SECOND AMPLIFIER, SAID SOURCE OF VOLTAGE, SAID FIRST RESISTOR, SAID SECOND RESISTOR, AND SAID SECOND AMPLIFIER BEING CONNECTED TO THE ELECTRODES APPLIED TO SAID THIN STRIP OF PIEZORESISTIVE MATERIAL SUCH THAT SAID THIN STRIPS OF PIEZORESISTIVE MATERIAL FROM TWO ARMS OF A BRIDGE CIRCUIT AND SAID RESISTOR AND SAID SECOND RESISTOR FORM THE OTHER TWO ARMS OF SAID BRIDGE CIRCUIT, SAID SOURCE OF VOLTAGE BEING CONNECTED TO TWO OPPOSITE TERMINALS OF SAID BRIDGE CIRCUIT AND THE INPUT OF SAID SECOND AMPLIFIER BEING CONNECTED TO THE OTHER TWO TERMINALS OF SAID BRIDGE CIRCUIT.