Patent ID: 6487898
Filing Date: 2002-12-03
Classification: G01L

Abstract:
A combustion chamber pressure transducer comprising:a body adapted for mounting in a sensing port in a combustion chamber and defining a cavity therein; a resilient pressure responsive diaphragm closing an opening of said cavity and formed of material capable of withstanding the temperatures and pressures of said combustion chamber; a coupling disc formed of a material having a relatively high coefficient of thermal expansion with respect to said body slidingly supported within said cavity and having an upper extension and a lower extension, said upper extension contacting said diaphragm; and a beam member made of piezoresistive material supported within said cavity with a portion of said beam member contacting said lower extension of said coupling disc, said beam member being electrically responsive to combustion pressure induced movement of said diaphragm transferred through said coupling disc, with said lower extension being operative for effecting a bending of said beam thereby generating an electrical signal in response to said bending.