Optics: measuring and testing – By dispersed light spectroscopy – With monochromator structure
Patent
1981-04-06
1984-06-19
Evans, F. L.
Optics: measuring and testing
By dispersed light spectroscopy
With monochromator structure
G01J 318
Patent
active
044550871
ABSTRACT:
A monochromatic imaging apparatus comprising a pair of similar diffraction gratings, a pair of focusing lenses, a pair of collimating lenses, an entrance slit, an exit slit and an intermediate slit, and means for concurrently moving the two gratings; wherein a polychromatic source image is placed at the entrance slit, and a collimating lens collimates the light rays from the source image and projects the collimated rays onto the first diffraction grating thereby to disperse the rays. The dispersed rays are then focused by the first focusing lens onto the intermediate slit, and then collimated by the second collimating lens onto the second diffraction grating which thereupon recombines the dispersed light. The recombined rays are then focused by the second focusing lens onto the exit slit. The two gratings may be concurrently moved in opposite or similar directions about an axis in the grating ruling plane and at the centers thereof, and at similar angles, so that the angle of incidence at the first grating is equal to the angle of diffraction at the second grating. In this manner, a monochromatic image of the polychromatic source image will appear at the exit slit and be of a selected band of wavelengths of the visible or other spectrum dependent upon the angular position of the two gratings from zero order of diffraction.
REFERENCES:
patent: 3586442 (1971-06-01), Tripp
patent: 3664742 (1972-05-01), Witte et al.
Murty, Applied Optics, Jul. 1972, vol. 11, No. 7, pp. 1637, 1638.
Peisakhson, Sov. J. Opt. Technol., vol. 47, No. 2, Feb. 1980, pp. 73, 74.
Murty, Applied Optics, vol. 11, No. 10, Oct. 1972, pp. 2286-2288.
Allemand Charly D.
Brewer David L.
Evans F. L.
Hamamatsu Systems Inc.
Kriegsman Irving M.
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