Patent ID: 8514394
Filing Date: 2013-08-20
Classification: G01J

Abstract:
1. A spectrograph for measuring radiation as a function of wavelength comprising: a lens for collecting radiation to be measured; at least one detector for generating output signals as a function of position on the at least one detector; a first optical assembly for angularly dispersing the collected radiation as a function of wavelength for measurement by the at least one detector; a second optical assembly for angularly dispersing the collected radiation as a function of wavelength for measurement by the at least one detector, wherein a spectrum of the dispersed radiation from the second optical assembly reaching the at least one detector is different from a spectrum of the dispersed radiation from the first optical assembly, and wherein each of the first and second optical assemblies include a first transmissive grating and a mirror arranged so that the collected radiation passes through the first grating, is reflected off the mirror and then passes back through the first grating a second time before reaching said detector; and a mechanism supporting the first and second optical assemblies and including a movable portion for moving the first and second optical assemblies between first and second positions for selectively aligning the dispersed radiation from one of the first and second optical assemblies with the at least one detector depending upon a desired spectrum to be measured.