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Proceedings Paper

Model of fringing in the WFC3 CCDs
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Paper Abstract

The Wide Field Camera 3 (WFC3) is an instrument which is being developed for the Hubble Space Telescope. It will have a UV/VIS channel which will include two 2051 X 4096 pixel, thin, backside illuminated CCDs. These CCDs produce interference fringes in narrow band or monochromatic light images taken in the 700 nm to 1000 nm wavelength range. We have obtained 146 monochromatic images for each of the four flight candidate CCDs. These images can be used to model the physical structure of the CCD, which are described by a set of parameters deduced by solving the Fresnel equations for the absorption within the CCD as a function of wavelength. We have used the formalism developed to model the Space Telescope Imaging Spectrograph's CCD by Malumuth et. al. to determine the free parameters for a large portion of one of the WFC3 flight candidate CCDs. From these fits we are able to evaluate the ability to fit the fringing of real data by comparing a model fringe flat to an observed fringe flat. We find that we should be able to reduce the observed fringe amplitude by a factor of five or better. Finally we show that for a certain class of object (extended emission line object with a variety of radial velocities) this model is an excellent method for removing the effect of fringing.

Paper Details

Date Published: 24 February 2003
PDF: 10 pages
Proc. SPIE 4854, Future EUV/UV and Visible Space Astrophysics Missions and Instrumentation, (24 February 2003); doi: 10.1117/12.459789
Show Author Affiliations
Eliot M. Malumuth, NASA Goddard Space Flight (United States)
Science Systems and Applications, Inc. (United States)
Robert J. Hill, NASA Goddard Space Flight (United States)
Science Systems and Applications, Inc. (United States)
Edward S. Cheng, NASA Goddard Space Flight (United States)
David A. Cottingham, NASA Goddard Space Flight (United States)
Global Science and Technology, Inc. (United States)
Yiting Wen, NASA Goddard Space Flight (United States)
Science Systems and Applications, Inc. (United States)
Scott D. Johnson, NASA Goddard Space Flight (United States)
Global Science and Technology, Inc. (United States)


Published in SPIE Proceedings Vol. 4854:
Future EUV/UV and Visible Space Astrophysics Missions and Instrumentation
J. Chris Blades; Oswald H. W. Siegmund, Editor(s)

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