Noise measurement hydrophone

Claim 1

A TRANSDUCER FOR THE CONVERSION OF SONIC VIBRATIONS IN A FLUID MEDIUM TO ELECTRICAL ENERGY COMPRISING; A HOLLOW CYLINDRICAL SEALING SLEEVE OF RIGID WATERPROOF MATERIAL, A CYLINDRICAL AXIALLY POLARIZED CRYSTAL MOTOR LOCATED WITHIN SAID SLEEVE AND SPACED THEREFROM IN SUBSTANTIALLY COAXIAL RELATIONSHIP; A LOW MASS DIAPHRAGM CEMENTED TO ONE AXIAL END OF SAID CRYSTAL MOTOR; A RELATIVELY HIGH MASS DIAPHRAGM CEMENTED TO THE OPPOSITE AXIAL END OF SAID MOTOR, SAID DIAPHRAGMS BEING WITHIN AND SPACED FROM SAID SLEEVE WITH A PERIPHERAL GROOVE IN THE SURFACE OF EACH ADJACENT SAID SLEEVE; AN O-RING OF RESILIENT MATERIAL MOUNTED IN EACH SAID GROOVE AND ENGAGING THE INNER SURFACE OF SAID SLEEVE TO POSITION SAID MOTOR AND DIAPHRAGMS; A CLOSED HOLLOW CYLINDRICAL HOUSING SURROUNDING SAID SLEEVE; RESILIENT MOUNTING MEANS FOR SUPPORTING SAID SLEEVE IN SPACED RELATIONSHIP TO THE INNER WALLS OF SAID HOUSING; AND A LIQUID MEDIUM FILLING THE SPACE SEPARATING THE HOUSING AND SAID SLEEVE AND CONTACTING BOTH OF SAID DIAPHRAGMS.