Patent ID: 6901806
Filing Date: 2005-06-07
Classification: G01L

Abstract:
1. An electrical capacitance sapphire diaphragm pressure sensor, comprising: a pressure-sensing element having a pressure-receiving part with a deposition electrode formed on each of the opposing surfaces of sapphire diaphragms which are provided in opposing relation to each other, and a securing part with a metal deposited on a portion of the surface of each of the sapphire diaphragms; a metal base for securing the pressure-sensing element at its securing part; a conductive sealing agent for sealing a gap between said securing part with a deposited metal and said metal base; and a nickel protective layer for protecting at least said conductive sealing agent from a medium whose pressure is to be measured; whereby a measured pressure of the medium is transferred to said pressure-receiving part, and the resulting variations in a distance between the deposition electrodes formed on the opposing faces of the sapphire diaphragms cause a change in capacitance.