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US 4,984,888 AGranted
Two-dimensional spectrometer
AssigneeIMO Industries, Inc.
InventorReginald Tobias
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AssigneeIMO Industries, Inc.
InventorReginald Tobias
Estimating the term…
The invention contemplates a two-dimensional spectrometer wherein a single catadioptric system is both the collimator and the camera for two-pass use of any two-dimensionally dispersed spectrometer. Off-axis aberration effects are minimized by arranging a fiber optic as the light-entrance aperture, on the central optical axis of the spectrometer and in close proximity to or centrally inserted in a two-dimensional array detector at the image plane. In other words, the grating of the spectrometer is also a reflector which folds admitted and dispersed light for return to the image plane along essentially the same path and through the same optical elements as are used on the incoming pass of light to the diffraction grating. The invention is shown for its applicability to each of various types of two-dimensional spectrometer-design configurations.
A two-dimensional spectrometer, having a central optical axis for incoming light to be analyzed, a two-dimensional detector array generally transverse to said axis with at least some of its detector elements adjacent to said axis, catadioptric optical means including a mirror system and a refractor/corrector system, each of which systems is a sector of an optical figure of revolution about said central optical axis, said refractor/corrector system producing a collimated beam parallel to but offset from said central optical axis, a two-dimensional dispersive optical device effectively normal to the collimated beam and producing a reflected cross-dispersed beam back through said refractor/corrector system and said mirror system to said detector array.
A two-dimensional spectrometer, having a central optical axis for incoming light to be analyzed, a detector array generally transverse to said axis with at least some of its detector elements adjacent to said axis, catadioptric optical means including a mirror system and a refractor/corrector system, each of which systems is a sector of an optical figure of revolution about said central optical axis, said refractor/collector system producing from a point source of incoming light on the central optical axis a collimated beam parallel to but offset from said central optical axis, a two-dimensional dispersive optical device effectively normal to the collimated beam and producing a reflected cross-dispersed beam back through said refractor/corrector system and said mirror system to a focal plane which includes said detector array and said point source of incoming light.
Dependencies are inferred from the claim text.