Document
Services
-
Articles citing this article
-
Same authors
- Recommend this article
- Download citation
- Alert me if this article is cited
- Alert me if this article is corrected
BibSonomy
CiteUlike
Connotea
Del.icio.us
Digg
Facebook
Free access article
|
|||||||||||||||
Astronomy and Astrophysics Supplement Series, Vol. 116, No. 3, April 1996, 367-371
Detection of scattered light in telescopes
F. Grundahl and A.N. Sørensen
Send offprint requests to: F. Grundahl; fgj@obs.aau.dk
Institute of Physics and Astronomy, University of Aarhus, DK-8000 Århus C, Denmark
Received August 29; accepted September 25, 1995
Abstract:
We present a simple, but powerful method to test for the presence of scattered light in telescopes. Scattered light can seriously hamper any attempt to achieve a proper flat fielding of CCD data. The method consists of making a pinhole camera (camera obscura) by placing a pinhole mask in front of the CCD window. Exposing the CCD in this configuration gives an image of the light sources in the optical path. Tests made at the Nordic Optical Telescope have led to a reduction of large scale flat field variations due to scattered light from a total of
5% to
below 1% by improving the telescope baffles.
Key words: instruments: miscellaneous --- telescopes
web@edpsciences.com
| What is OpenURL? |
The OpenURL standard is a protocol for transmission of metadata describing the resource that you wish to access. An OpenURL link contains article metadata and directs it to the OpenURL server of your choice. The OpenURL server can provide access to the resource and also offer complementary services (specific search engine, export of references...). The OpenURL link can be generated by different means.
- If your librarian has set up your subscription with an OpenURL resolver, OpenURL links appear automatically on the abstract pages.
- You can define your own OpenURL resolver with your EDPS Account. In this case your choice will be given priority over that of your library.
- You can use an add-on for your browser (Firefox or I.E.) to display OpenURL links on a page (see http://www.openly.com/openurlref/). You should disable this module if you wish to use the OpenURL server that you or your library have defined.