Statistics – Applications
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001sf2a.conf..563f&link_type=abstract
Abstracts from SF2A-2001: Semaine de l'Astrophysique Francaise, meeting held in Lyon, France, May 28-June 1st, 2001, Eds.: F. Co
Statistics
Applications
Scientific paper
Some new types of detector have just appear in the last decade pushing the limits in term of very low light level detection. High Angular Resolution astronomy usually uses 2 types of detectors: "conventional" detectors and photon counting detectors. Among the photon counting detectors, a very promising solution could be Superconducting Tunnel Junctions (STJ) detectors. They are able to count optical photons from the UV (200 nm) to the near infrared (2000 nm), with a good quantum efficiency (about 70%), a good temporal response (about 10 kHz/detector) and an energy resolution that does not exist in semiconductor-based devices. STJ first applications could be: fringe sensor for interferometry, or a visible and near-IR wavefront sensor. A radically new CCD development by Marconi Applied Technologies, available very soon, has enabled substantial internal gain within the CCD before the signal reaches the output amplifier. With reasonably high gain, sub-electron readout noise levels are achieved even at MHz pixel rates. This technology may have the conjugate advantages of the CCD's and of the photon counting detectors. Among the conventional detectors, I will present a recent CCD application: the wavefront sensor for the NAOS adaptive optic system for the VLT (ESO). New type of CMOS visible detectors are also fabricated by the Rockwell Science Center. The "multiple readouts" technique used by the IR CMOS detectors can be used in the visible and may decrease the readout noise down to about 1 e-, but the frame rate also decreases.
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