Patent ID: 9689744
Date: 2017-06-27
CPC Classifications: G01J

Claim:
1. A visible-infrared plane grating imaging spectrometer, consisting of: an entrance slit for transmitting light, an achromatic doublet lens with a reflective back surface, a plane reflective diffraction grating immersed in a wedged optical element, an order sorting filter, a visible-infrared detector; said entrance slit, said achromatic doublet lens with the reflective back surface, said plane reflective diffraction grating immersed in a wedged optical element, said order sorting filter, and said detector for visible and infrared radiation positioned wherein, said entrance slit transmits light to said achromatic doublet lens with the reflective back surface, which refracts light and then reflects the light back from the surface, passing back through the lens and is directed to said plane reflective diffraction grating immersed in a wedged optical element, said wedged optical element refracts the light then the reflective diffraction grating spectrally disperses and directs the light back through the wedged optical element, which refracts light to said achromatic doublet lens with the reflective back surface, said achromatic doublet lens with the reflective back surface refracts light and then reflects the light from the back surface, passing back through the lens and focuses it to said order sorting filter, said order sorting filter transmits the selected spectral orders to said visible-infrared detector.