pressure transducers used in oil drilling.

摘要

A pressure sensor of the invention can perform pressure measurements under very severe mechanical and thermal conditions. It comprises a cell (10A, 10B) carrying a strain-measuring circuit. The cell is placed inside a body (2, 4) and is put into contact with the pressure to be measured. The cell has a hermetically sealed internal chamber (12) inside which pressure is set to a low value. The outside surface of the cell is subjected to the pressure to be measured. The cell is constituted by two half-shells (10A, 10B) joining together according to a join plane. The cell is preferably made of sapphire, with the crystal axis of the sapphire being perpendicular to the join plane so as to obtain isotropic stresses. The circuit is deposited on a plane surface of one of the half-shells, parallel to the join plane. The sensor is particularly suitable for testing oil deposits.