Transactions of the Korean Society of Mechanical Engineers B (대한기계학회논문집B)

The Korean Society of Mechanical Engineers (대한기계학회)
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Measurement of Thermal Diffusivity Using Minimum Phase Based on the Photothermal Displacement

광열변위의 최소위상을 이용한 열확산계열수 측정

  • Lee, Eun-Ho (Dept.of Mechanical Engineering, Graduate School of Ajou University) ;
  • Lee, Gwang-Jae (Dept.of Mechanical Engineering, Graduate School of Ajou University) ;
  • Jeon, Pil-Su (Dept.of Mechanical Engineering, Graduate School of Ajou University) ;
  • Yu, Jae-Seok (Dept.of Mechanical Industry Engineering, Ajou University) ;
  • Kim, Gi-Hyeon
  • 이은호 (아주대학교 대학원 기계공학과) ;
  • 이광재 (아주대학교 대학원 기계공학과) ;
  • 전필수 (아주대학교 대학원 기계공학과) ;
  • 유재석 (아주대학교 기계 및 산업공학부) ;
  • 김기현
  • Published : 2001.03.01
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Abstract

A new method of measuring the thermal diffusivity of solid material at room temperature using photothermal displacement is proposed. The influence of the parameters, such as radius and modulation frequency of the pump beam and the sample thickness, was studied. From the minimum position of phase of measured deflection with respect to the pump beam, the thermal diffusivity of the materials can be obtained. The position where phase has the minimum value is determined using multiparameter least-square regression fitting. The experimental values for different samples obtained by applying the new method are in good agreement with the literature values.

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References

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