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Abstract

A multiple spectral imager includes three modular imaging spectrometers, each having a respective collimator, dispersing element, and imaging system. Each collimator includes a pair of parabolic reflectors having a common focal point and an elongated slit positioned at the focal point, and each collimator defines a pupil near the respective dispersing element. The dispersing elements disperse light from various positions along the slit of the collimator into the respective imaging system, and each of the imaging systems includes an array detector that intercepts the dispersed light from the respective dispersing element and registers spectral information in a first direction and spatial information in a second direction. The spectrometers are stacked adjacent to one another, and light from a single directing mirror enters the collimators of all three of the spectrometers. The three array detectors are each responsive to a separate respective spectral region.

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First Claim