| 摘要 |
A gas sensor in which exhaust gas is introduced into a chamber 2 provided to a gas sensor element 1, the oxygen concentration in an upstream pump cell 3 is reduced, and NOx is detected in exhaust gas in a downstream sensor cell 4, wherein the surface of a shielding sheet 13 and/or a solid electrolyte sheet 11 constituting a wall face of the chamber 2 is configured so as to have a curved shape convex toward the inside of the chamber at the position where the pump cell 3 is formed, the amount of curvature is set to a range of 0.10% to 1.38%, and the height Hp of a diffusion layer 21 in the layering direction thereof is configured so as to be less than the average height Have of the chamber in the layering direction at the position where the pump cell is formed. |
