Sight glass container for airway test bench

The invention provides a sight glass container for an air passage test bench, which comprises a bottom plate and a cover body fixed on the bottom plate, the inner cavity of the cover body is used for arranging a reflector, the bottom plate is provided with a lower vent hole communicated with the cover body for connecting a vent pipe, and the top wall of the cover body is provided with an upper vent hole for butt joint installation of a simulation cylinder sleeve. Light holes are formed in two adjacent side walls or three side walls of the cover body so that the sight glass can be installed in a sealed mode. According to the sight glass container, an airway flow field characteristic test can be conveniently carried out by adopting a PIV (Particle Image Velocimetry) technology, the three side walls of the cover body are all provided with the light transmitting holes for mounting the sight glass, so that light rays can be conveniently transmitted into the cover body, and various forms of light path arrangement c