| 摘要 |
A gas sensor includes a light source 17 configured to emit light for gas component estimation and a light detector 18 configured to receive light transmitted while being reflected in a cell. The cell includes a parallel flat-plate-shaped cell body 11 and a parallel-flat-plate-shaped lid member 12 mounted on the cell body 11, the cell body 11 includes a flat ellipsoidal-column shaped cell space 13 having a constant depth, the lid member 12 or the cell body 11 is formed with openings 16A, 16B configured to encourage gas to be measured to flow in and flow out, the light source 17 is provided on one focal line L1 of the cell space 13, the light detector 18 is provided on the other focal line L2 of the cell space 13, and an entire surface surrounding the cell space 13 is formed into a light reflecting surface. Accordingly, even when the length of optical path is increased, the cell is prevented from becoming three-dimensionally bulky, the amount of gas required for filling up the cell may be small, and a compact gas sensor having high sensitivity is provided. |
