Patent ID: 7069770
Filing Date: 2006-07-04
Classification: G01N,Y02A,Y10T

Abstract:
1. A sensor element, comprising: a co-fired heater section comprising a heater, a shield, and a temperature sensor, with a first insulating layer disposed between the heater and the shield, and a second insulating layer disposed between the shield and the temperature sensor; a sensing section comprising an electrode portion and a sensing portion, wherein the sensing portion is disposed on a side of the electrode portion opposite the heater section; and a third insulating layer disposed between the electrode portion and the temperature sensor, wherein the heater further comprises, a serpentine, wherein the serpentine comprises center inner legs, second inner legs, and outer legs, and wherein the second inner legs have a varying second width, and leads in electrical communication with the outer legs, wherein, during operation, the heater has a longitudinal temperature gradient of less than or equal to about 5° C.