| 摘要 |
A gas sensor (10A) includes a first space (20) for a measurement gas from a gas-introducing hole (28) via a first diffusion rate-determining section (30), a main pumping means (44) for controlling a partial pressure of oxygen in the measurement gas introduced into the first space (20) to have a predetermined value, a second space (22) for the measurement gas from the first space (20) via a second diffusion rate-determining section (32), and a measuring pumping means (74) for reducing or decomposing a NOx component in the measurement gas introduced from the second space (22) via a third diffusion rate-determining section (72) so that oxygen produced thereby is pumped out to detect a current generated by pumping out the oxygen. A ratio (Wc/We) between a width (We) of an end of a sensor element (12) and a width (Wc) of the gas-introducing hole (28) is not less than 30% and less than 70%. <IMAGE> |
