2001 Fiscal Year Final Research Report Summary
Simultaneous Measurements of Thermal Relaxation Times and Thermal Diffusivity at Low Temperature by Transient Laser-Heating Technique
| Project/Area Number |
11450085
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Thermal engineering
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| Research Institution | Shizuoka University |
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Principal Investigator |
AKAKI Nobuyuki Fac. of Engineering, Mechanical Engineering, Shizuoka University, Prof., 工学部, 教授 (90005314)
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| Co-Investigator(Kenkyū-buntansha) |
SUGIYAMA Yu Hamamatsu Photonics K.K., Group Leader, 室長(研究職)
TANG Dawei Fac. of Engineering, Mechanical Engineering, Shizuoka University, Assistant, 工学部, 助手 (40262795)
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| Project Period (FY) |
1999 – 2001
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| Keywords | Heat Conduction / Non-Fourier Problem / Thermal Diffusivity / Thermal Relaxation Time / High-Speed Heating by Laser / High-Speed Temperature Response / Optical Reflectance Method / Low Temperature |
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| Research Abstract |
The transient temperature measurement gives approaches to not only high-speed measurement of thermophysical properties but also some new phenomena in heat conduction. In this work, the temperature dependency of optical reflectivity is determined by a laser ellipsometer at a wavelength of 632.8 nm in the range of low temperature. A transient reflectance measurement system is developed for measuring the transient temperature responses in range of 10 K to 300 K by using the continuous wave probing technique. The front surface of a foil specimen is heated by a laser-pulse irradiation. In situ measurement of the reflectivity of a continuous wave laser at the rear surface is conducted, the transient temperature response of film is then deduced using the temperature dependence of reflectivity. A general method for estimating the thermal diffusivity and relaxation parameters is given by the inverse analysis of generalized heat conduction problem. The method is employed to deduce thermophysical properties by fitting theoretical formulae to the experimental data of temperature rise. The stainless steel foils are chosen as samples and the accuracy is examined by comparing with the theoretical temperature responses and the thermal diffusivity data from the literatures. What done in this work gives the theoretical and experimental preparations to study the non-Fourier phenomena in the future.
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