Optics: measuring and testing – By dispersed light spectroscopy – Utilizing a spectrometer
Patent
1988-03-02
1989-07-25
McGraw, Vincent P.
Optics: measuring and testing
By dispersed light spectroscopy
Utilizing a spectrometer
356334, G01J 318, G01J 336
Patent
active
048507067
ABSTRACT:
A spectral analysis system which may operate as a spectrograph or monochromator comprises a folded optical path within a housing wherein the optical input is provided on one side and the optical output is provided on an opposite side at a spectral focal field, thereby separating optical and electrical functions. The folded optical path is provided within a vertically extending portion of the housing providing for a narrow profile to the optical instrument and keeping the entrance and exit apertures in-line in close proximity. The grating is caused to operate in a near Littrow condition with a reflecting prism having first and second inclined surfaces which respectively reflect entrance aperture light to said grating and disperse exit aperture light from said grating along paths slightly inclined to the Littrow axis of the grating. The prism surface reflecting light to the spectral focal field may be cylindrically concave to focus the output radiation at different frequencies onto a substantially planar spectral focal field. The grating is operated with the spectral separation occurring in a plane orthogonal to the plane containing the gratings recording points. A tilt adjustment for the grating may employed in order to operate the spectral analysis system as a monochromator.
REFERENCES:
patent: 3753618 (1973-08-01), Haley
patent: 4183668 (1980-01-01), Lindblom
patent: 4405199 (1983-02-01), Ogle et al.
patent: 4412744 (1983-11-01), Lee et al.
patent: 4601036 (1986-07-01), Faxvog et al.
American Holographic, Inc.
McGraw Vincent P.
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