| 摘要 |
An NDIR(Non-dispersive infrared absorption) gas measuring apparatus is provided to miniaturize the size of the apparatus and to accurately measure the gas density when the apparatus is applied to a gas requiring a long reaction distance such as carbon dioxide gas. An NDIR(Non-dispersive infrared absorption) gas measuring apparatus includes a bench section including an infrared lamp, an optical bench, and a bench section. In the optical bench, a light passage(103) having a same width and bent in multiple steps is formed by installing a partition wall(102) in a body(101). Reflection mirrors(105) are installed at corner portions of the light passage. A plurality of ventilation holes(109) are formed on the upper and lower sides of a space portion outside the partition wall of the light passage. Ventilation holes(110) communicating the space portion and the light passage are formed in the partition wall.
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