Cross-track infrared sounder FPAA performance

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

doi:10.1117/12.583390

20 January 2005 Cross-track infrared sounder FPAA performance

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

Author Affiliations +

Proceedings Volume 5655, Multispectral and Hyperspectral Remote Sensing Instruments and Applications II; (2005) https://doi.org/10.1117/12.583390
Event: Fourth International Asia-Pacific Environmental Remote Sensing Symposium 2004: Remote Sensing of the Atmosphere, Ocean, Environment, and Space, 2004, Honolulu, Hawai'i, United States

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 [λ_c(98 K) ~ 5 mm], MWIR [λ_c(98 K) ~ 9 mm], and LWIR [λ_c(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 Hg_1-xCd_xTe 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-Hz^1/2/W at 14.0 mm, 9.3 x 10¹⁰ cm-Hz^1/2/W at 8.0 mm and 3.0 x 10¹¹ cm-Hz^1/2/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-Hz^1/2/W at 14.0 mm, 1.0 x 10¹¹ cm-Hz^1/2/W at 8.0 mm and 3.1 x 10¹¹ cm-Hz^1/2/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 Hz^1/2/W at 14.0 mm, 1.4 x 10¹¹ cm-Hz^1/2/W at 8.0 mm and 4.1 x 10¹¹ cm-Hz^1/2/W at 4.64 mm.

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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, and James E. Andrews "Cross-track infrared sounder FPAA performance", Proc. SPIE 5655, Multispectral and Hyperspectral Remote Sensing Instruments and Applications II, (20 January 2005); https://doi.org/10.1117/12.583390

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