Optics: measuring and testing – By dispersed light spectroscopy – Utilizing a spectrometer
Patent
1995-05-26
1996-10-15
Evans, F. L.
Optics: measuring and testing
By dispersed light spectroscopy
Utilizing a spectrometer
G01J 318
Patent
active
055659837
ABSTRACT:
A spectrometer includes a pair of crossed reflective gratings to effect a spectrally dispersed beam that is focussed to an array detector. The second grating is a plural grating with a surface formed of a first portion and a second portion. The first portion has a groove density for effecting ultraviolet in the dispersed beam. The second portion has a groove density for effecting visible radiation in the dispersed beam. A shutter blocks or exposes the second portion of the grating surface so as to select the first spectral range or the second spectral range for detection. The plural grating surface preferably may be contoured to compensate for aberrations in focussing of the beam to the detector. A computer may be used for selecting spectral lines for analysis, particularly selecting such lines in the second range that are not interfered with by the first range.
REFERENCES:
patent: 3521943 (1970-07-01), Kelderman
patent: 3523734 (1970-08-01), Brehm et al.
patent: 3791737 (1974-02-01), Johansson
patent: 4766287 (1988-08-01), Morrisroe et al.
patent: 4820048 (1989-04-01), Barnard
Evans F. L.
Grimes Edwin T.
Ingham Herbert S.
The Perkin-Elmer Corporation
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