Optical multipath system - has turntable reflecting objective and composite mirror assembly for IR spectral analysis

摘要

The system directs radiation (1) from a light source (2) through an input window (3,20) on a mirror objective (6) which can be turned around the axis (8). The light beam is directed by it on an assembly of a flat (16) and a concave mirror (17) at right angles to each other. After two reflections from the mirror (17) and one from the mirror (16) the beam leaves through a window next to the input window. The composite mirrors (16,17) are mounted in such a way that the angles of incidence of the light beam (1) on the mirror (17) with the greater curvature are less than those on the mirror (16) with the smaller curvature. Igniting of inclined light beams at any flux passage angle is reduced.