Development of a novel method for measuring thermal conductivity of small solids using thermal mode spectroscopy

2017 Fiscal Year Final Research Report

• Project/Area Number: 16K13719
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: General applied physics
• Research Institution: Osaka University
• Principal Investigator: Ogi Hirotsugu 大阪大学, 大学院工学研究科, 教授 (90252626)
• Co-Investigator(Kenkyū-buntansha): 中村 暢伴 大阪大学, 基礎工学研究科, 助教 (50452404) ; 石田 秀士 大阪大学, 基礎工学研究科, 助教 (80283737)
• Project Period (FY): 2016-04-01 – 2018-03-31
• Keywords: 熱モード / 熱伝導率 / 固有値問題 / レーザー計測

Outline of Final Research Achievements

Heat conduction possesses (thermal) modes in analogy with acoustics even without oscillation. Here, we establish thermal-mode spectroscopy to measure thermal diffusivity of small specimens. Local heating with a light pulse excites such modes that show antinodes at the heating point, and photothermal detection at another antinode spot allows measuring relaxation behavior of the desired mode selectively: The relaxation time yields thermal diffusivity. The Ritz method is proposed for arbitrary geometry specimens. This method is applicable even to a diamond crystal with mm dimensions.

Free Research Field

超音波工学