A Possible Nonlinearity in IDS / Image Dissector Scanner / Data

Details A Possible Nonlinearity in IDS / Image Dissector Scanner / Data A Possible Nonlinearity in IDS / Image Dissector Scanner / Data

Mar 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985msngr..39...15r&link_type=abstract

The Messenger, No. 39/MAR, P.15, 1985

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Scientific paper

Most of the users of the Image Dissector Scanners mounted on the Boiler & Chivens Cassegrain spectrographs on La Silla will be aware of the high count rate nonlinearity of the IDS. The typical figure for this saturation effect is a 10 per cent loss at count rates in excess of some 2,000 detected events per channel per second. For a linear dispersion of 1.7 Aper channel (171 Aper mm grating) this corresponds to a 10 mag star at the 3.6 m and an 8 mag star at the 1.5 m telescopes. In the following I will report on another nonlinearity effect present at very low light levels, i.e. for count rates below 100 counts per second and channel, and discuss some of the possible sources and implications.

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