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Proceedings Paper

An experiment for developing a micro-crack alert system for large thin mirror
Author(s): Naruhisa Takato; Ryuji Miyagawa; Kiyoshi Shigemori; Masanori Iye; Kiichi Okita; Akihiko Miyashita; Toshiyuki Sasaki; Tomonori Usuda; Masuo Sonoda; Hiroshi Kubota
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Paper Abstract

We have a plan to install a micro-crack alert system for the primary mirror of Subaru Telescope based on the monitoring of the acoustic emission from any incident events. We report the results of our preliminary experiment for characterizing the acoustic properties of actual Subaru primary mirror. The attenuation of acoustic wave was confirmed to be small enough to allow detection of such events at any locations of the mirror. The position of incident events that might lead to the generation of possible micro-cracks can be identified within less than 3 cm accuracy by placing seven acoustic sensors along the circumference of the primary mirror.

Paper Details

Date Published: 29 September 2004
PDF: 8 pages
Proc. SPIE 5495, Astronomical Structures and Mechanisms Technology, (29 September 2004); doi: 10.1117/12.552453
Show Author Affiliations
Naruhisa Takato, Subaru Telescope/National Astronomical Observatory of Japan (Japan)
Ryuji Miyagawa, Kumamoto Industrial Research Institute (Japan)
Kiyoshi Shigemori, Kumamoto Industrial Research Institute (Japan)
Masanori Iye, National Astronomical Observatory of Japan (Japan)
Kiichi Okita, Okayama Astrophysical Observatory (Japan)
Akihiko Miyashita, National Astronomical Observatory of Japan (Japan)
Toshiyuki Sasaki, National Astronomical Observatory of Japan (Japan)
Tomonori Usuda, National Astronomical Observatory of Japan (Japan)
Masuo Sonoda, Kumamoto Industrial Research Institute (Japan)
Hiroshi Kubota, Shock Wave and Condensed Matter Research Ctr./Kumamoto Univ. (Japan)


Published in SPIE Proceedings Vol. 5495:
Astronomical Structures and Mechanisms Technology
Joseph Antebi; Dietrich Lemke, Editor(s)

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