Fig. 18

The layout of the automated efficiency checker (AEC) at Richardson Gratings (Newport Corp.) is shown. The apparatus is in a dark room and is computer operated. The grating and the scan arm can move independently to allow either monochromator mode (fixed grating deviation angle) or spectrograph mode (fixed grating incidence angle) or any other geometry (e.g. fixed wavelength, scanning incidence angle) to be measured.