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Proceedings Paper

Modeling effects of common molecular contaminants on the Euclid infrared detectors
Author(s): W. Holmes; C. McKenney; R. Barbier; H. Cho; A. Cillis; J-C. Clemens; O. Dawson; G. Delo; A. Ealet; A. Feizi; N. Ferraro; R. Foltz; T. Goodsall; M. Hickey; T. Hwang; U. Israelsson; M. Jhabvala; D. Kahle; Em. Kan; Er. Kan; G. Lotkin; T. Maciaszek; S. McClure; L. Miko; L. Nguyen; S. Pravdo; E. Prieto; T. Powers; M. Seiffert; P. Strada; C. Tucker; K. Turck; A. Waczynski; F. Wang; C. Weber; J. Williams
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Paper Abstract

Cleanliness specifications for infrared detector arrays are usually so stringent that effects are neglibile. However, the specifications determine only the level of particulates and areal density of molecular layer on the surface, but the chemical composition of these contaminants are not specified. Here, we use a model to assess the impact on system quantum efficiency from possible contaminants that could accidentally transfer or cryopump to the detector during instrument or spacecraft testing and on orbit operation. Contaminant layers thin enough to meet typical specifications, < 0.5μgram/cm2, have a negligible effect on the net quantum efficiency of the detector, provided that the contaminant does not react with the detector surface, Performance impacts from these contaminant plating onto the surface become important for thicknesses 5 - 50μgram/cm2. Importantly, detectable change in the ”ripple” of the anti reflection coating occurs at these coverages and can enhance the system quantum efficiency. This is a factor 10 less coverage for which loss from molecular absorption lines is important. Thus, should contamination be suspected during instrument test or flight, detailed modelling of the layer on the detector and response to very well known calibrations sources would be useful to determine the impact on detector performance.

Paper Details

Date Published: 29 July 2016
PDF: 9 pages
Proc. SPIE 9904, Space Telescopes and Instrumentation 2016: Optical, Infrared, and Millimeter Wave, 99042R (29 July 2016); doi: 10.1117/12.2233778
Show Author Affiliations
W. Holmes, Jet Propulsion Lab. (United States)
C. McKenney, Jet Propulsion Lab. (United States)
National Institute of Standards and Technology (United States)
California Institute of Technology (United States)
R. Barbier, Institut de Physique Nucleaire de Lyon (France)
H. Cho, Jet Propulsion Lab. (United States)
A. Cillis, Univ. of Maryland Balitmore County (United States)
J-C. Clemens, Ctr. de Physique des Particules de Marseille, CNRS (France)
O. Dawson, Jet Propulsion Lab. (United States)
G. Delo, Global Science and Technology, Inc. (United States)
A. Ealet, Ctr. de Physique des Particules de Marseille, CNRS (France)
A. Feizi, AK Aerospace Technology Corp. (United States)
N. Ferraro, Jet Propulsion Lab. (United States)
R. Foltz, NASA Goddard Space Flight Ctr. (United States)
T. Goodsall, Jet Propulsion Lab. (United States)
M. Hickey, NASA Goddard Space Flight Ctr. (United States)
T. Hwang, Arctic Slope Regional Corp. (United States)
U. Israelsson, Jet Propulsion Lab. (United States)
M. Jhabvala, NASA Goddard Space Flight Ctr. (United States)
D. Kahle, NASA Goddard Space Flight Ctr. (United States)
Em. Kan, NASA Goddard Space Flight Ctr. (United States)
Er. Kan, NASA Goddard Space Flight Ctr. (United States)
G. Lotkin, NASA Goddard Space Flight Ctr. (United States)
T. Maciaszek, CNES, Ctr. National dEtudes Spatiales (France)
S. McClure, Jet Propulsion Lab. (United States)
L. Miko, NASA Goddard Space Flight Ctr. (United States)
L. Nguyen, Univ. of Maryland Baltimore County (United States)
S. Pravdo, Jet Propulsion Lab. (United States)
E. Prieto, Lab. d Astrophysique de Marseilles (France)
T. Powers, Univ. of Maryland Baltimore County (United States)
M. Seiffert, Jet Propulsion Lab. (United States)
P. Strada, European Space Research and Technology Ctr. (Netherlands)
C. Tucker, NASA Goddard Space Flight Ctr. (United States)
K. Turck, Global Science and Technology, Inc. (United States)
A. Waczynski, NASA Goddard Space Flight Ctr. (United States)
F. Wang, Arctic Slope Regional Corp. (United States)
C. Weber, Jet Propulsion Lab. (United States)
J. Williams, Global Science and Technology, Inc. (United States)


Published in SPIE Proceedings Vol. 9904:
Space Telescopes and Instrumentation 2016: Optical, Infrared, and Millimeter Wave
Howard A. MacEwen; Giovanni G. Fazio; Makenzie Lystrup; Natalie Batalha; Nicholas Siegler; Edward C. Tong, Editor(s)

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