Influence of scattered light on accurate CCD flat fielding --- necessity of modifying baffles of some existent reflectors

Details Influence of scattered light on accurate CCD flat fielding --- necessity of modifying baffles of some existent reflectors Influence of scattered light on accurate CCD flat fielding --- necessity of modifying baffles of some existent reflectors

Jul 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005acasn..46..343y&link_type=abstract

Acta Astronomica Sinica, vol. 46, no. 3, p. 343-352

Astronomy and Astrophysics

Astronomy

Telescope, Techniques: Image Processing, Techniques: Ccd Flat Fielding

Scientific paper

This paper is the continuation of paper [1]. In this paper we further show that the difference between twilight flat field and night sky exposure is mainly due to the existence of scattered light. Like Grundahl and Sorensen, we also made the pinhole images of the 1.56m at the Shanghai Observatory and the 63cm of the Nanjing University to show the existence of scattered light intuitively. Both the 1.56m and the 63cm reflectors have normal designed baffles. Therefore it is the common weakness of all standard designed reflectors having only two baffles mounted in front of the primary and secondary mirrors which are not enough to protect the CCD cameras from scattered light in getting accurate flat fields. It is of great importance to modify the primary mirror baffle of all similar reflectors in order to get more accurate flat fielding.

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