Miniature air chamber

The utility model discloses a miniature air chamber which comprises an air chamber, and an input collimator is arranged in the air chamber. A band-pass optical filter is arranged at the rear end of the input collimator; a reflecting unit for changing a light ray propagation path is arranged in the air chamber; and an output collimator is also arranged in the gas chamber. The method is very suitable for environmental gas detection, especially for places with small spaces and severe environments; the detection gas chamber is simple in structure, convenient and durable, all devices are mature optical devices, and integration and industrial amplification of a detection system are facilitated. 本实用新型公开了一种微型气室，包括气室，所述气室内设置有输入准直器；所述输入准直器后端设置有带通滤光片；所述气室内设置有改变光线传播路径的反射单元；所述气室内还设置有输出准直器。对于环境气体检测特别是空间小环境恶劣的场所十分适用；检测气室结构简单，方便耐用，所用器件均为成熟光学器件，便于探测系统的集成化、工业化放大。