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Proceedings Paper

Developing a new data acquisition devices for COMICS
Author(s): Shigeyuki Sako; Hirokazu Kataza; Takashi Miyata; Yoshiko Kataza Okamoto; Shinya Takubo; Mitsuhiko Honda; Takashi Onaka; Takuya Yamashita
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Paper Abstract

We developed a new data acquisition device for COMICS, a mid infrared instrument of the Subaru telescope. The new device was installed in place of our previous data acquisition device with a lower data transfer speed. The new device is 32 bit PCI bus and PC Linux based and provides bus-master DMA transfer function. It consists of a clock pattern generator, frame memories, and an image co-adder. In order to achieve high operational efficiency for mid infrared instruments, the data handling speed is essential as well as the speed of A/D converter. The data transfer to the hard disk drive on the PC is made during acquiring the data at the rate higher than the data generation rate. As a result, we succeeded to reduce the dead time due to the data transfer procedure from 60 sec to less than 1 sec for 200 frames (64M bytes). Furthermore by replacing the host computer by a higher performance PC, the observation efficiency of COMICS was improved from 44% to 74% in the imaging mode. This PCI based data acquisition device can also be applied to the other instruments that have fast data rates.

Paper Details

Date Published: 7 March 2003
PDF: 8 pages
Proc. SPIE 4841, Instrument Design and Performance for Optical/Infrared Ground-based Telescopes, (7 March 2003); doi: 10.1117/12.461916
Show Author Affiliations
Shigeyuki Sako, Subaru Telescope/NAOJ (United States)
Univ. of Tokyo (Japan)
Hirokazu Kataza, Institute of Space and Astronautical Science (Japan)
Takashi Miyata, Kiso Observatory Institute of Astronomy/Univ. of Tokyo (Japan)
Yoshiko Kataza Okamoto, Kitasato Univ. (Japan)
Shinya Takubo, Subaru Telescope/NAOJ (United States)
Univ. of Tokyo (Japan)
Mitsuhiko Honda, Subaru Telescope/NAOJ (United States)
Univ. of Tokyo (Japan)
Takashi Onaka, Univ. of Tokyo (Japan)
Takuya Yamashita, Subaru Telescope/NAOJ (United States)


Published in SPIE Proceedings Vol. 4841:
Instrument Design and Performance for Optical/Infrared Ground-based Telescopes
Masanori Iye; Alan F. M. Moorwood, Editor(s)

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