Reconstructing CCD flat fields using nonuniform background-illumination sources

Walter J. Wild

doi:10.1117/12.316834

9 July 1998 Reconstructing CCD flat fields using nonuniform background-illumination sources

Walter J. Wild

Proceedings Volume 3355, Optical Astronomical Instrumentation; (1998) https://doi.org/10.1117/12.316834
Event: Astronomical Telescopes and Instrumentation, 1998, Kona, HI, United States

Abstract

Precision CCD photometry over large fields-of-view and detection of faint and diffuse objects demand great care in the acquisition of flat-field frames. Variations in the illuminated field will introduce spatial variability in the flat field. Small angular displacements of the CCD, telescope, and instrument, with respect to the external light source yields a corresponding linear translation of the image on the CCD with respect to the true flat-field function, so that a functional equation relates the flat field to these shifted data sets. In two-dimensions an elliptic partial differential equation relating the offset CCD measurements to the flat- field function can be derived enabling relaxation solution techniques to be used. A simulation is presented and discussed.

Citation Download Citation

Walter J. Wild "Reconstructing CCD flat fields using nonuniform background-illumination sources", Proc. SPIE 3355, Optical Astronomical Instrumentation, (9 July 1998); https://doi.org/10.1117/12.316834

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available