Back to results
US 5,565,983 AGranted
Optical spectrometer for detecting spectra in separate ranges
AssigneeThe Perkin-Elmer Corporation
InventorThomas W. Barnard
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeThe Perkin-Elmer Corporation
InventorThomas W. Barnard
Estimating the term…
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.
An optical spectrometer for separate detection of different spectral ranges, comprising initial dispersion means receptive of source radiation to effect light radiation in the form of an initial spectrum, a plural dispersion grating receptive of the initial spectrum and being crossed with the initial dispersion means to effect a spectrally dispersed beam, and detector means comprising a two dimensional array of photodetectors receptive of the beam for spectral detection thereof, wherein the plural dispersion grating has a grating surface comprising a first surface portion and a second surface portion, the first portion having a first groove configuration for effecting the dispersed beam in a first spectral range, and the second portion having a second groove configuration for effecting the dispersed beam in a second spectral range different than the first spectral range.
Dependencies are inferred from the claim text.