Long-optical-path gas detection device with fine adjustment mechanism
The invention relates to a long-optical-path gas detection device with a fine adjustment mechanism. The long-optical-path gas detection device comprises a container, wherein the container is internally provided with an airtight gas chamber; a first concave mirror and a second concave mirror which are arranged opposite to an emitting surface are arranged in the gas chamber of the container; a fine adjustment reflecting mirror is arranged on one side of the first concave mirror; a parallel light emitter and a photoelectric sensor are arranged on the container and positioned on the two sides of the first concave mirror; the parallel light emitter is close to the fine adjustment reflecting mirror; a light source emitting end of the parallel light emitter and a light ray receiving end of the photoelectric sensor stretch into the gas chamber. The long-optical-path gas detection device adopts a multiple reflection method to reduce the volume of the gas chamber and improve the detection capability of an instrument. The fine adjustment reflecting mirror can change the path of reflected light and reflect back the reflected light again, so the effective optical path can be increased and the standard distance effect can be avoided.