ACOUSTIC PRESSURE TRANSDUCER Russian patent published in 1995 - IPC

FIELD: instrumentation. SUBSTANCE: acoustic pressure transducer has case 1 with membrane 2 which carries working piezoelement 3 and vibration compensation unit placed inside case. Unit is manufactured in the form of hollow cylinder 4 with compensating membrane 5 which carries piezoelement 6. Collet 7 pressed against surface of membrane 5 with threaded bushing 8 is located inside cylinder 4. Pressing element 9 is positioned inside collet 7. Collet 7 is fixed against turning over with lockpin 10. Current collector 11 is used to pick off signals from piezoelements. Diameter of opening of collet 7 in free state should be smaller than diameter of membrane 2 by value Δ which is necessary for control over compensation unit by change of frequency of its inherent oscillations within range overlapping frequency of inherent oscillations of working unit. EFFECT: increased precision of measurements. 1 dwg