MONOCHROMATOR

摘要

PP. 1235. An Ebert monochromator e.g. for a spectrophotometer, in which the diffraction grating is positioned off the central optical axis of the collimator mirror by interpositioning a plane mirror between collimator and grating. The plane mirror may be movable to select one of several diffraction gratings. By arranging the diffraction grating about an axis parallel with the central optical axis a simple mechanical wavelength drive system with a common cam-shaft driving the grating, a filter holder and a rotatable slit plate, can be provided. Further gratings may be driven from the cam-shaft as may the movable plane mirror which selects them.