Patent ID: 6310347
Filing Date: 2001-10-30
Classification: G01J

Abstract:
An optical spectrometer system having a central axis comprising:a detector having a detector surface disposed at one end of the system and located at a focal plane of the optical spectrometer system;a cold stop associated with the detector for permitting entrance of target source radiation onto said detector surface while blocking radiation from the surroundings;cooling means coupled to the detector for cooling the detector and the cold stop to a predetermined low temperature;a flat plate having a spectrometer slit formed therein, said plate having a flat surface facing said detector, said flat surface being coated with a highly reflective, low emissivity material;fore-optics means located in front of the flat plate for focusing radiation onto the slit at the flat plate at a telecentric space between the fore-optics means and collimating lenses, said collimating lenses being located between the flat plate and the cold stop for collimating light from the slit and forming a pupil at the cold stop; anda dispersion element associated with said cold stop for dispersing light toward said detector surface.