On Cross-talk Correction of Images from Multiple-port CCDs
Abstract
Multi-channel CCD read-out, which is an option offered at most optical observatories, can significantly reduce the time spent on reading the detector. The penalty of using this option is the so-called amplifier cross-talk, which causes contamination across the output amplifiers, typically at the level of 1:10 000. This can be a serious problem for applications where high precision and/or high contrast is of importance. We represent an analysis of amplifier cross-talk for two instruments - FORS1 at the ESO VLT telescope Antu (Paranal) and DFOSC at the Danish 1.54 m telescope (La Silla) - and present a post-processing method for removing the imprint of cross-talk. It is found that cross-talk may significantly contaminate high-precision photometry in crowded fields, but it can be effectively eliminated during data reduction.
- Publication:
-
Experimental Astronomy
- Pub Date:
- 2001
- DOI:
- 10.1023/A:1021820418263
- Bibcode:
- 2001ExA....12..147F
- Keywords:
-
- amplifier;
- cross-talk;
- detection: CCD;
- instrumentation: high-precision photometry