Patent ID: 6355152
Filing Date: 2002-03-12
Classification: G01N

Abstract:
A gas sensor for measuring an amount of a measurement gas component contained in a measurement gas existing in an external space, said gas sensor at least comprising:a substrate composed of a solid electrolyte to make contact with the external space; an internal space formed at the inside of said substrate; a gas-introducing port for introducing measurement gas from the external space into said internal space; a diffusion rate-determining slit passage for introducing measurement gas from the external space into said internal space via said gas-introducing port under a predetermined diffusion resistance; a buffering space provided between said gas-introducing port and said slit passage; and a pumping means including an inner pumping electrode and an outer pumping electrode formed at the inside and outside of said internal space respectively, for pumping-processing oxygen contained in the measurement gas introduced from the external space, on the basis of a control voltage applied between said electrodes, wherein: said slit passage has, when viewed in a plane substantially perpendicular to a longitudinal extension axis thereof, two dimensions, and at least one dimension is not more than 10 &mgr;m; and said buffering space has a cross-sectional area greater than that of said slit passage.