Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1978-10-31
1980-05-27
Smith, Alfred E.
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
250338, 250353, 356328, G01J 100
Patent
active
042052297
ABSTRACT:
A cooled echelle grating spectrometer for detecting wavelengths between one micron and fifteen microns. More specifically, a spectrometer is disclosed having a cross-dispersing grating for ordering infrared energy, and an echelle grating for further ordering of the infrared energy. Means are disclosed to direct infrared energy to the cross-dispersing grating and then to the echelle grating. Ordered radiation from the echelle grating is sensed by a detecting means. Means are also disclosed for cooling the cross-dispersing grating, the echelle grating and the detecting means so that background radiation can be minimized. In a specific embodiment the cross-dispersing grating and echelle grating are in separate enclosed volumes having access to each other through a single intermediate aperture, reflected energy from the cross-dispersing grating being focused so as to pass through the intermediate aperture and then collimated and directed to the echelle grating for further ordering. Also disclosed is use of a Schmidt camera for focusing the further ordered radiation from the echelle grating onto a detector array having individual detectors dispersed on a plane which substantially corresponds to a curved focal plane of the Schmidt camera. A spectrometer constructed according to the teachings of the present invention will continuously cover the spectrum between one micron and fifteen microns and have a resolution of 0.1 cm..sup.-1.
REFERENCES:
patent: 3658423 (1972-04-01), Elliott
McNutt et al., "Cryogenic Infrared Grating Spectrometer", Applied Optics, vol. 14, No. 5, May 1975, pp. 1116-1119.
Butcher, "An Echelle Grating for the 74-inch Coude", Pro. Astron. Soc. Anst. (Australia), vol. 2, No. 1, Jul. 1971, pp. 21-22.
Schroeder, "Design Considerations for Astronomical Echelle Spectrographs", Publ. Astron. Soc. Pacific, vol. 82, No. 490, Dec. 1970, pp. 1253-1275.
Schroeder et al., "An Echelle Spectrograph for Astronomical Use", Pub. Astron. Soc. Pacific, vol. 83, No. 494, Aug. 1971, pp. 438-446.
Beer Reinhard
Frosch Robert A. Administrator of the National Aeronautics and Space
Fields Carolyn E.
Manning John R.
McCaul Paul F.
Mott Monte F.
Smith Alfred E.
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