A scanning monochromator or spectrometer having a reflecting grating whose curvature in the meridian plane is equal to the curvature of a circle upon which the source, detecting means and grating lie and whose lines are ruled with a frequency which varies systematically and directly in proportion to...http://www.google.es/patents/US4027975?utm_source=gb-gplus-sharePatente US4027975 - Scanning monochromator and concave reflecting grating employed therein
Scanning monochromator and concave reflecting grating employed therein
