A Double-Head Photon-Counting Photometer for Fast Timing Observations

Details A Double-Head Photon-Counting Photometer for Fast Timing Observations A Double-Head Photon-Counting Photometer for Fast Timing Observations

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002arep...46.1030p&link_type=abstract

Astronomy Reports, Vol. 46, Issue 12, pp. 1030-1041

Astronomy and Astrophysics

Astronomy

Scientific paper

The structure of the electronics of the two-head, high-speed photometer operating on the 152-cm G.D. Cassini telescope of Bologna University has been fully redesigned for high-time-resolution observations of fast variable sources, in particular, of the optical counterparts of X-ray binary systems. The fast photometer now permits sampling times from 0.1 ms to 100 s. The handling of the system clock and I/O configuration have been modified to provide rigorous synchronization of the sampling time with an external high-stability clock and the continuous acquisition of an uninterrupted data stream. The continuous data-acquisition process, which is driven by an external clock, is limited only by the capacity of the hard disk and is supported by a double-buffer SRAM memory designed to overcome any discontinuity in the asynchronous communication with the computer. Real-time monitoring of the data enables continuous evaluation of the weather conditions, and the directly displayed light curve can be used to determine the optimal management of the observations.

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