We report on the design, tolerancing, and laboratory breadboard of an imaging spectrometer for the Earth Science Decadal Survey Hyperspectral and Infrared Imager (HyspIRI) mission. The spectrometer is of the Offner type but with a much longer slit than typical designs, with 1600 resolvable spatial elements along the slit for a length of 48 mm. Two such spectrometers cover more than the required swath while maintaining high throughput and signal-to-noise thanks to the large pixel size (30 μm), relatively high speed (F/2.8) and small number of reflections. We also demonstrate a method for measuring smile using a linear array, and use the method to prove the achievement of negligible smile of less than 2% of a pixel over the entire 48 mm slit. Thus we show that this high-heritage, all-spherical mirror design can serve the requirements of the HyspIRI mission.

Date Published: 15 September 2014
PDF: 8 pages
Proc. SPIE 9222, Imaging Spectrometry XIX, 92220E (15 September 2014); doi: 10.1117/12.2062768

Published in SPIE Proceedings Vol. 9222:
Imaging Spectrometry XIX
Pantazis Mouroulis; Thomas S. Pagano, Editor(s)