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Proceedings Paper

Imaging spectrometer trade studies: a detailed comparison of the Offner-Chrisp and reflective triplet optical design forms
Author(s): Lacy G. Cook; John F. Silny
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Paper Abstract

High quality imaging spectroscopy data is useful for both military and civilian applications. Current state-of-the-art imaging spectrometers typically rely on the Offner-Chrisp (OC) optical form. Making use of a spherically concentric, axially symmetric, and telecentric design, the OC imaging spectrometer provides excellent spectral-spatial uniformity but with many regrets: (1) no real-entrance pupil, (2) relatively slow optical speeds, (3) required convex diffraction grating, (4) narrow field-of-view, and (5) limited scalability. Recently, the Raytheon patented Reflective Triplet (RT) optical design form has produced extremely large format imaging spectrometers of exceptional quality. The RT optical design provides spectral-spatial uniformity comparable to the OC form, but with a number of advantages: (1) extremely large fields-of-view, (2) faster optical speeds, (3) a real-entrance pupil for optimal cold shielding and calibration, (4) use of either a prism or flat diffraction grating operating in collimated space (with an option for both simultaneously in a 2- channel device), and (5) extremely wide spectral range using common reflective optics and multiple focal plane arrays, dispersive elements, and entrance slits. This paper presents a number of detailed designs exemplifying the differences between the OC and RT forms.

Paper Details

Date Published: 26 August 2010
PDF: 14 pages
Proc. SPIE 7813, Remote Sensing System Engineering III, 78130F (26 August 2010); doi: 10.1117/12.862734
Show Author Affiliations
Lacy G. Cook, Raytheon Space & Airborne Systems (United States)
John F. Silny, Raytheon Space & Airborne Systems (United States)

Published in SPIE Proceedings Vol. 7813:
Remote Sensing System Engineering III
Philip E. Ardanuy; Jeffery J. Puschell, Editor(s)

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