Patent ID: 6254750
Filing Date: 2001-07-03
Classification: G01N

Abstract:
A sensor for detecting one or more components of a gaseous emission selected from the group consisting of CO, CO.sub.2, H.sub.2, O.sub.2, and H.sub.2 O, the sensor comprising:a detection cavity defined by a diffusion passage across which the gaseous emission enters the detection cavity, a first ceramic substrate which forms a portion of the detection cavity, and a second ceramic substrate which forms another portion of the detection cavity;a first oxygen pumping cell including a first electrode having an oxidative catalytic activity positioned within the detection cavity and in contact with the first ceramic substrate, and a second electrode positioned outside the detection cavity and in contact with the first ceramic substrate;a sensing cell including a third electrode positioned within the detection cavity and in contact with the second ceramic substrate, and a fourth electrode positioned outside the detection cavity and in contact with the second ceramic substrate;a second oxygen pumping cell including a fifth electrode having an oxidative catalytic activity positioned within the detection cavity and in contact with the first ceramic substrate, the fifth electrode oxidative catalytic activity being different than the oxidative activity of the first electrode, and a sixth electrode positioned outside the detection cavity and in contact with the first ceramic substrate; andelectronics which measure an air/fuel ratio using the sensing cell and the first pump cell and measure a combustion completeness using the first and second pumping cells.