Patent ID: 6725514
Filing Date: 2004-04-27
Classification: G01K,G01L,Y10T

Abstract:
A method of forming a sensor for detecting the pressure and temperature of a pressurized fluid, comprising the steps of:forming a sensor element including a thin metal diaphragm portion, an annular side-wall axially depending from a rim of said diaphragm portion, and a central mass radially enclosed by said sidewall and axially depending from an inboard central portion of said diaphragm portion; forming a layer of dielectric on an outboard surface of said diaphragm portion opposite said sidewall and central mass; depositing a patterned layer of piezo-resistive thick-film paste on said dielectric layer between axial extensions of said sidewall and central mass, and drying and firing such paste to form a set of piezo-resistor elements for detecting stress in said diaphragm portion due to said pressurized fluid; and depositing a region of temperature sensitive thick-film resistive paste on said dielectric layer between axial extensions of said sidewall and central mass, and drying and firing such paste to form a thermistor element for detecting a temperature of said diaphragm portion due to said pressurized fluid.