Gas sensor

Details Gas sensor Gas sensor

1998-06-29

2000-08-15

Williams, Hezron

Measuring and testing

Gas analysis

Gas of combustion

73 3106, 73 3105, 338 34, 422 98, G01N 2716, G01N 2700, G01N 2712, H01L 0700, B32B 0900

Patent

active

061018651

ABSTRACT:
A porous Al.sub.2 O.sub.3 thick film covers the SrTiO.sub.3 layer of an oxygen sensor, said SrTiO.sub.3 layer being contacted by means of two Pt electrodes and deposited on an Al.sub.2 O.sub.3 substrate. The electrically insulating Al.sub.2 O.sub.3 layer bears a protective layer, which is exposed to the exhaust gas and is preferably also made of SrTiO.sub.3. This construction ensures that the output signal of the sensor representing the oxygen partial pressure then depends only on the resistance or, respectively, conductivity value of the non-contaminated SrTiO.sub.2 sensor layer.

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