Patent ID: 6568274
Filing Date: 2003-05-27
Classification: G01L

Abstract:
A pressure transducer assembly, comprising:(A) a housing member defining an interior cavity, said housing member having a first coefficient of thermal expansion; (B) a diaphragm mounted in said housing member and dividing said interior cavity into a first chamber and a second chamber, a portion of said diaphragm flexing in a first direction in response to a pressure in said first chamber being higher than a pressure in said second chamber, said portion of said diaphragm flexing in a second direction opposite said first direction in response to said pressure in said second chamber being higher than said pressure in said first chamber; (C) an electrode disposed in said first chamber and joined to said housing member, said electrode including a conductor, said electrode having a second coefficient of thermal expansion, said second coefficient being different from said first coefficient; and (D) a low thermal coefficient of expansion member rigidly connected to said housing member proximate where said electrode is joined to said housing member, said low thermal coefficient of expansion member having a third coefficient of thermal expansion, said third coefficient being lower than said first and second coefficients.