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Proceedings Paper

The NASA enhanced MODIS airborne simulator
Author(s): Thomas A. Ellis; Jeffrey Myers; Patrick Grant; Steven Platnick; Daniel C Guerin; John Fisher; Kai Song; Joseph Kimchi; Louis Kilmer; Daniel D LaPorte; Christopher C Moeller
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Paper Abstract

The new NASA Enhanced MODIS Airborne Simulator (eMAS) is based on the legacy MAS system, which has been used extensively in support of the NASA Earth Observing System program since 1995. eMAS consists of two separate instruments designed to fly together on the NASA ER-2 and Global Hawk high altitude aircraft. The eMAS-IR instrument is an upgraded version of the legacy MAS line-scanning spectrometer, with 38 spectral bands in the wavelength range from 0.47 to 14.1 μm. The original LN2-cooled MAS MWIR and LWIR spectrometers are replaced with a single vacuum-sealed, Stirling-cooled assembly, having a single MWIR and twelve LWIR bands. This spectrometer module contains a cold optical bench where both dispersive optics and detector arrays are maintained at cryogenic temperatures to reduce infrared background noise, and ensure spectral stability during high altitude airborne operations. The EMAS-HS instrument is a stand-alone push-broom imaging spectrometer, with 202 contiguous spectral bands in the wavelength range from 0.38 to 2.40 μm. It consists of two Offner spectrometers, mated to a 4-mirror anastigmatic telescope. The system has a single slit, and uses a dichroic beam-splitter to divide the incoming energy between VNIR and SWIR focal plane arrays. It will be synchronized and bore-sighted with the IR line-scanner, and includes an active source for monitoring calibration stability. eMAS is intended to support future satellite missions including the Hyperspectral Infrared Imager ( HyspIRI,) the National Polar-orbiting Operational Environmental Satellite System (NPOESS) Preparatory Project (NPP,) and the follow-on Joint Polar Satellite System (JPSS.)

Paper Details

Date Published: 13 September 2011
PDF: 9 pages
Proc. SPIE 8153, Earth Observing Systems XVI, 81530N (13 September 2011); doi: 10.1117/12.894482
Show Author Affiliations
Thomas A. Ellis, NASA Ames Research Ctr. (United States)
Jeffrey Myers, NASA Ames Research Ctr. (United States)
Patrick Grant, NASA Ames Research Ctr. (United States)
Steven Platnick, NASA Goddard Space Flight Ctr. (United States)
Daniel C Guerin, Brandywine Photonics LLC (United States)
John Fisher, Brandywine Photonics LLC (United States)
Kai Song, Teledyne Judson Technologies (United States)
Joseph Kimchi, Teledyne Judson Technologies (United States)
Louis Kilmer, Teledyne Judson Technologies (United States)
Daniel D LaPorte, Univ. of Wisconsin-Madison (United States)
Christopher C Moeller, Univ. of Wisconsin-Madison (United States)

Published in SPIE Proceedings Vol. 8153:
Earth Observing Systems XVI
James J. Butler; Xiaoxiong Xiong; Xingfa Gu, Editor(s)

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