An experiment for developing a micro-crack alert system for large thin mirror

Naruhisa Takato; Ryuji Miyagawa; Kiyoshi Shigemori; Masanori Iye; Kiichi Okita; Akihiko Miyashita; Toshiyuki Sasaki; Tomonori Usuda; Masuo Sonoda; Hiroshi Kubota

doi:10.1117/12.552453

29 September 2004 An experiment for developing a micro-crack alert system for large thin mirror

Naruhisa Takato, Ryuji Miyagawa, Kiyoshi Shigemori, Masanori Iye, Kiichi Okita, Akihiko Miyashita, Toshiyuki Sasaki, Tomonori Usuda, Masuo Sonoda, Hiroshi Kubota

Author Affiliations +

Proceedings Volume 5495, Astronomical Structures and Mechanisms Technology; (2004) https://doi.org/10.1117/12.552453
Event: SPIE Astronomical Telescopes + Instrumentation, 2004, Glasgow, United Kingdom

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.

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Naruhisa Takato, Ryuji Miyagawa, Kiyoshi Shigemori, Masanori Iye, Kiichi Okita, Akihiko Miyashita, Toshiyuki Sasaki, Tomonori Usuda, Masuo Sonoda, and Hiroshi Kubota "An experiment for developing a micro-crack alert system for large thin mirror", Proc. SPIE 5495, Astronomical Structures and Mechanisms Technology, (29 September 2004); https://doi.org/10.1117/12.552453

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