Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009a%26a...508..531n&link_type=abstract
Astronomy and Astrophysics, Volume 508, Issue 1, 2009, pp.531-539
Astronomy and Astrophysics
Astrophysics
8
Instrumentation: Photometers, Techniques: Miscellaneous, Instrumentation: Miscellaneaous
Scientific paper
Context: A new extremely high speed photon-counting photometer, Iqueye, has been installed and tested at the New Technology Telescope, in La Silla. Aims: This instrument is the second prototype of a “quantum” photometer being developed for future Extremely Large Telescopes of 30-50 m aperture. Methods: Iqueye divides the telescope aperture into four portions, each feeding a single photon avalanche diode. The counts from the four channels are collected by a time-to-digital converter board, where each photon is appropriately time-tagged. Owing to a rubidium oscillator and a GPS receiver, an absolute rms timing accuracy better than 0.5 ns during one-hour observations is achieved. The system can sustain a count rate of up to 8 MHz uninterruptedly for an entire night of observation. Results: During five nights of observations, the system performed smoothly, and the observations of optical pulsar calibration targets provided excellent results.
Anzolin Gabriele
Barbieri Carlo
Belluso Massimiliano
Billotta Sergio
Bolli Pietro
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