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Proceedings Paper

Thermal analysis on hex-placement patterns of the Gemini primary mirrors
Author(s): Myung K. Cho; William R. Powell
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Paper Abstract

The photoacoustic tow-beam phase lag method was described for studying the thermal diffusivity of metal and superconductor materials in this paper. A beam of laser modulated from an argon ion laser is divided into the two beams, which illuminate respectively front and rear surface of the sample. The phase photoacoustic signal difference (phase lag) can be measured by lock-in amplifier. The phase lag is related to thermal diffusivity of sample. We measured the metal samples such as lead, copper, aluminium and stainless-steel in room temperature, and the results are very agreeable with the other method. We also have studied the temperature dependence of the thermal diffusivity of the high-temperature superconductor Bi1.5Pb0.5Sr2Ca2Cu3O. The experimental results are presented.

Paper Details

Date Published: 11 November 1996
PDF: 17 pages
Proc. SPIE 2857, Advanced Materials for Optical and Precision Structures, (11 November 1996); doi: 10.1117/12.258296
Show Author Affiliations
Myung K. Cho, Optical Sciences Ctr./Univ. of Arizona (United States)
William R. Powell, Corning Inc. (United States)


Published in SPIE Proceedings Vol. 2857:
Advanced Materials for Optical and Precision Structures
Mark A. Ealey, Editor(s)

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