Optics: measuring and testing – By dispersed light spectroscopy – Utilizing a spectrometer
Patent
1997-09-10
1998-11-10
Evans, F. L.
Optics: measuring and testing
By dispersed light spectroscopy
Utilizing a spectrometer
G01J 318
Patent
active
058352104
ABSTRACT:
A multi-pass spectrometer. Light from a source is expanded and collimated with a collimating optic into a collimated beam. The collimated beam illuminates a dispersing optic such as a grating from which light is reflected back toward the collimating optic. A transmitting-reflecting optic is positioned across the collimated beam to cause at least two reflections of at least a portion of the collimated beam from the dispersing optic. A photometer measures the double dispersed beam at a range of spacial locations in order to determine spectral characteristics of the light from the light source. In a preferred embodiment, a partially reflecting mirror is positioned between the grating and a collimated optic. This mirror is positioned at an angle slightly different from 90 degrees so that a portion of the light reflected from the dispersing optic is reflected back toward the dispersing optic at a slightly different range of angles. A portion of this second reflected beam is dispersed again and reflected at a different range of angles by the dispersing optic. A portion of this second reflected beam transmits the partially reflecting mirror and may be focused, and the intensity of the light at spatially distinct positions are measured by a photometer to access spectral characteristics of the light source. In a second preferred embodiment, the light from a third reflected beam is measured.
REFERENCES:
Hettrick, Michaeal C., "In-focus monochromator: theory and experiment of a new grazing incidence mounting", Applied Optics, 1 Nov. 1990, vol. 29, No. 31, pp. 4531-4535.
Loewen, Erwin G. and Popov, Evgeny, "Diffraction Gratings and Applications", Copyright 1997, pp. 191-247 and pp. 464-474.
Murcray, David G., Murcray, Frank H. and Walter J. Williams, "A Balloon-Borne Grating Spectrometer", Applied Optics, Feb. 1967, vol. 6, No. 2, pp. 191-196.
Palmer, Christopher, "Absolute astigmatism correction for flat field spectrographs", Applied Optics, 1 May 1989, vol, 28, No. 9, pp. 1605-1607.
Cymber, Inc.
Evans F. L.
Ross John R.
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