Development of a New Converging Thermal Wave Technique for Diffusivity Measurement of High Conductivity Thin Foils

Major problems in measuring thermal diffusivity by using conventional optical technique arise due to difficulties in detecting the thermal signals particularly from high conductivity material in the form of thin foils. Despite the laser beam being tightly focused to form a heating ring on the sample...

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Main Author:	Husin, Mohd Shahril
Format:	Thesis
Language:	English English
Published:	2008
Subjects:	Thermal wave Thermal diffusivity - Measurement Thin films
Online Access:	http://psasir.upm.edu.my/id/eprint/5095/1/FS_2008_4.pdf
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spelling	my-upm-ir.50952013-05-27T07:20:22Z Development of a New Converging Thermal Wave Technique for Diffusivity Measurement of High Conductivity Thin Foils 2008 Husin, Mohd Shahril Major problems in measuring thermal diffusivity by using conventional optical technique arise due to difficulties in detecting the thermal signals particularly from high conductivity material in the form of thin foils. Despite the laser beam being tightly focused to form a heating ring on the sample surface, to the point that it could damage the sample, to induce converging thermal waves, the collected signals remain weak. The problems were overcome in this report by using a very large number of optical heating rings instead of a single heating ring in the conventional method. The thermal wave signals at the centre of the ring were generated subsequent to the absorption of the optical pulse beam in the form of a very large number of concentric rings. The signal was found to fit very reasonably well to the theoretical model signal based on very large number of concentric heating rings. The capability of the new design was proven from the measurement of thermal diffusivity of standard thin foils of Al, Cu, Zn, Ni and Brass of thickness in the range of ()0.75200 μm− with accuracy within 1%. In the case of Al and Cu foils, its thermal diffusivity was successfully measured for much thinner foil of thickness down to and as compare torespectively in the previous report. Thermal wave Thermal diffusivity - Measurement Thin films 2008 Thesis http://psasir.upm.edu.my/id/eprint/5095/ http://psasir.upm.edu.my/id/eprint/5095/1/FS_2008_4.pdf application/pdf en public masters Universiti Putra Malaysia Thermal wave Thermal diffusivity - Measurement Thin films Faculty of Science English
institution	Universiti Putra Malaysia
collection	PSAS Institutional Repository
language	English English
topic	Thermal wave Thermal diffusivity - Measurement Thin films
spellingShingle	Thermal wave Thermal diffusivity - Measurement Thin films Husin, Mohd Shahril Development of a New Converging Thermal Wave Technique for Diffusivity Measurement of High Conductivity Thin Foils
description	Major problems in measuring thermal diffusivity by using conventional optical technique arise due to difficulties in detecting the thermal signals particularly from high conductivity material in the form of thin foils. Despite the laser beam being tightly focused to form a heating ring on the sample surface, to the point that it could damage the sample, to induce converging thermal waves, the collected signals remain weak. The problems were overcome in this report by using a very large number of optical heating rings instead of a single heating ring in the conventional method. The thermal wave signals at the centre of the ring were generated subsequent to the absorption of the optical pulse beam in the form of a very large number of concentric rings. The signal was found to fit very reasonably well to the theoretical model signal based on very large number of concentric heating rings. The capability of the new design was proven from the measurement of thermal diffusivity of standard thin foils of Al, Cu, Zn, Ni and Brass of thickness in the range of ()0.75200 μm− with accuracy within 1%. In the case of Al and Cu foils, its thermal diffusivity was successfully measured for much thinner foil of thickness down to and as compare torespectively in the previous report.
format	Thesis
qualification_level	Master's degree
author	Husin, Mohd Shahril
author_facet	Husin, Mohd Shahril
author_sort	Husin, Mohd Shahril
title	Development of a New Converging Thermal Wave Technique for Diffusivity Measurement of High Conductivity Thin Foils
title_short	Development of a New Converging Thermal Wave Technique for Diffusivity Measurement of High Conductivity Thin Foils
title_full	Development of a New Converging Thermal Wave Technique for Diffusivity Measurement of High Conductivity Thin Foils
title_fullStr	Development of a New Converging Thermal Wave Technique for Diffusivity Measurement of High Conductivity Thin Foils
title_full_unstemmed	Development of a New Converging Thermal Wave Technique for Diffusivity Measurement of High Conductivity Thin Foils
title_sort	development of a new converging thermal wave technique for diffusivity measurement of high conductivity thin foils
granting_institution	Universiti Putra Malaysia
granting_department	Faculty of Science
publishDate	2008
url	http://psasir.upm.edu.my/id/eprint/5095/1/FS_2008_4.pdf
_version_	1747810350329233408

Development of a New Converging Thermal Wave Technique for Diffusivity Measurement of High Conductivity Thin Foils

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