Subminiature pressure transducer

Claim 1

A PIEZOELECTRIC TRANSDUCER FOR MEASURING VARIABLE PRESSURES PREVAILING ON THE OUTER SURFACE OF A WALL OF A STRUCTURE PROVIDED WITH AN ORIFICE OF A GIVEN DIAMETER, SAID TRANSDUCER COMPRISING A THIN TUBULAR SUPPORT HAVING AT ONE END A COLLAR FOR FIXING TO THE INSIDE SURFACE OF SAID WALL COAXIALLY TO SAID ORIFICE, SAID COLLAR HAVING AN INSIDE DIAMETER EQUAL TO SAID GIVEN DIAMETER, AT THE OTHER END A GUIDING REINFORCEMENT OF INSIDE DIAMETER SLIGHTLY SMALLER THAN SAID GIVEN DIAMETER; A SLEEVE ADAPTED TO SLIDE COAXIALLY IN SAID GUIDING REINFORCEMENT AND INTERNALLY REINFORCED NEAR ONE OF ITS ENDS BY A DIAPHRAGM; A THIN PIEZOELECTRIC FLAKE MOUNTED AT SAID END OF SAID SLEEVE AND SUPPORTED BY SAID DIAPHRAGM THROUGH THE MEDIUM OF AN INSULATING ANNULAR SUPPORT, WHEREBY SAID FLAKE CAN BE ACCURATELY GUIDED AND FIXED IN LINE WITH THE OUTSIDSE SURFACE OF SAID WALL WITHOUT CONTACT BETWEEN SAID WALL AND SAID FLAKE WHICH IS THUS RELIEVED OF ALL BENDING STRESSES.