Patent ID: 6688181
Filing Date: 2004-02-10
Classification: G01L,Y10T

Abstract:
Pressure sensor able to operate at high temperature and to measure the pressure of a hostile medium, comprising:a sensing element integrating a membrane in monocrystalline silicon carbide and made by micro-machining a substrate in polycrystalline silicon carbide, a first surface of the membrane being intended to be in contact with said medium, a second surface of the membrane comprising detection means to detect membrane deformation and connected to electric contacts to connect electric connection means, the surfaces of the sensing element intended to be in contact with the said medium being chemically inert relative to this medium; a carrier supporting the sensing element so that said first surface of the membrane may be placed in contact with said medium and said second surface of the membrane may be shielded from contact with said medium, the carrier being in polycrystalline silicon carbide; a seal strip, in material containing silicon carbide, brazed between the carrier and the sensing element to shield the second surface of the membrane from any contact with said medium.