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Proceedings Paper

Cross-track infrared sounder FPAA performance
Author(s): Stacy A. Masterjohn; Arvind I. D'Souza; Larry C. Dawson; Peter N. Dolan; Genae Jefferson; Maryn G. Stapelbroek; Richard W. Willis; Priyalal S. Wijewarnasuriya; Ellen Boehmer; John C. Ehlert; James E. Andrews
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Paper Abstract

The Cross-track Infrared Sounder (CrIS), an interferometric sounder, is one of the instruments within the National Polar-orbiting Operational Environmental Satellite System (NPOESS) suite. CrIS measures earth radiances at high spectral resolution providing accurate and high-resolution pressure, temperature and moisture profiles of the atmosphere. These profiles are used in weather prediction models to track storms, predict levels of precipitation etc. Each CrIS instrument contains three Focal Plane Array Assemblies (FPAAs): SWIR [λc(98 K) ~ 5 mm], MWIR [λc(98 K) ~ 9 mm], and LWIR [λc(81 K) ~ 16 mm]. Each FPAA consists of nine large (850-mm-diameter) photovoltaic detectors arranged in a 3 x 3 pattern, with each detector having an accompanying cold preamplifier. This paper describes the selection methodology of the detectors that constitute the FPAAs and the performance of the CrIS SWIR, MWIR and LWIR proto-flight FPAAs. The appropriate bandgap n-type Hg1-xCdxTe was grown on lattice-matched CdZnTe. 850-mm-diameter photodiodes were manufactured using a Lateral Collection Diode (LCD) architecture. Custom pre-amplifiers were designed and built to interface with these large photodiodes. The LWIR, MWIR and SWIR detectors are operated at 81 K, 98 K and 98 K respectively. These relatively high operating temperatures permit the use of passive radiators on the instrument to cool the detectors. Performance goals are D* = 5.0 x 1010 cm-Hz1/2/W at 14.0 mm, 9.3 x 1010 cm-Hz1/2/W at 8.0 mm and 3.0 x 1011 cm-Hz1/2/W at 4.64 mm. Measured mean values for the nine photodiodes in each of the LWIR, MWIR and SWIR FPAAs are D* = 5.3 x 1010 cm-Hz1/2/W at 14.0 mm, 1.0 x 1011 cm-Hz1/2/W at 8.0 mm and 3.1 x 1011 cm-Hz1/2/W at 4.64 mm. These compare favorably with the following BLIP D* values calculated at the nominal flux condition: D* = 8.36 x 1010 cm Hz1/2/W at 14.0 mm, 1.4 x 1011 cm-Hz1/2/W at 8.0 mm and 4.1 x 1011 cm-Hz1/2/W at 4.64 mm.

Paper Details

Date Published: 20 January 2005
PDF: 10 pages
Proc. SPIE 5655, Multispectral and Hyperspectral Remote Sensing Instruments and Applications II, (20 January 2005); doi: 10.1117/12.583390
Show Author Affiliations
Stacy A. Masterjohn, DRS Sensors and Targeting Systems (United States)
Arvind I. D'Souza, DRS Sensors and Targeting Systems. (United States)
Larry C. Dawson, DRS Sensors and Targeting Systems (United States)
Peter N. Dolan, DRS Sensors and Targeting Systems (United States)
Genae Jefferson, DRS Sensors and Targeting Systems (United States)
Maryn G. Stapelbroek, DRS Sensors and Targeting Systems (United States)
Richard W. Willis, DRS Sensors and Targeting Systems (United States)
Priyalal S. Wijewarnasuriya, Rockwell Scientific Co. (United States)
Ellen Boehmer, Rockwell Scientific Co. (United States)
John C. Ehlert, ITT Industries, Inc. (United States)
James E. Andrews, ITT Industries, Inc. (United States)


Published in SPIE Proceedings Vol. 5655:
Multispectral and Hyperspectral Remote Sensing Instruments and Applications II
Allen M. Larar; Makoto Suzuki; Qingxi Tong, Editor(s)

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