Optics: measuring and testing – By dispersed light spectroscopy – Utilizing a spectrometer
Patent
1989-08-29
1991-11-19
Evans, F. L.
Optics: measuring and testing
By dispersed light spectroscopy
Utilizing a spectrometer
356334, G01J 320
Patent
active
050661272
ABSTRACT:
An improved method and apparatus for focused stigmatic imaging with spherical concave diffraction gratings incorporates a concave spherical diffraction grating with parallel, normally ruled lines. An entrance light beam source or projector propagates a beam of light to be analyzed through an entrance point and onto the surface of the diffraction grating. A light detector or analyzer is positioned at or near a detection point for detecting or characterizing the light diffracted from the grating. The entrance point and detection point are positioned in spaced-apart relation to each other and to the grating according to disclosed formulae, such that they are in respectively corresponding stigmatic or near stigmatic focus with each other.
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Advertisement page for the Model VM-521 and the Model VM-523 Vacuum Monochromators.
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Evans F. L.
Hyperfine, Inc.
Young James R.
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