| 摘要 |
A gas sensor includes an internal space, a diffusion control part, a pumping cell, and a measuring cell. A measurement gas is introduced to the internal space from the outside. The diffusion control part is in communication with the internal space in a lengthwise direction of the sensor element. The diffusion control part has a slit-like shape with a smaller thickness than that of the internal space. The diffusion control part applies a predetermined diffusion resistance to the measurement gas having been introduced from the internal space. The pumping cell is operable to pump out oxygen existing in the internal space when a predetermined voltage is applied between a first electrode formed on a surface of the internal space and a second electrode formed in a space different from the internal space. The measuring cell is operable to measure a current flowing between a third electrode and a fourth electrode when a voltage is applied between the third electrode and the fourth electrode. The third electrode is formed in the diffusion control part, and can reduce an oxide gas component in a predetermined gas component to which the predetermined diffusion resistance has been applied by the diffusion control part. The fourth electrode is formed in a part different from the diffusion control part. |
