| Study on thermal diffusivity of materials by laser photothermal reflection technique |
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| 作者姓名： | 王培吉 张奉军 董学仁 张仲 范素华 |
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| 作者单位： | School of Science，Jinan University，Jinan 250022，Department of Science and Technology，Jinan University，Jinan 250022，Department of Science and Technology，Jinan University，Jinan 250022，School of Science，Jinan University，Jinan 250022，School of Science，Jinan University，Jinan 250022 |
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| 基金项目： | This project was supported by Shandong National Science Foundation under Grant No. Y2002A08. |
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| 摘 要： | A method of measuring thermal diffusivity of materials at room temperature by photothermal reflection technique is described. An intensity-modulated Ar+ laser beam is used as incident light. The beam is focused to about 1 mm diameter spot and illuminates the sample surface. HgCdTe infrared detector is used to receive photothermal signal. Using this technique, the photothermal signals are experimentally measured as the function of different frequencies. The thermal diffusivities can be obtained by fitting the experimental data. On the other hand, the thermal diffusivities of one-way composite and orthogonal symmetric arranged composites Al2O3/Al are measured in transverse, longitudinal and arbitrary directions. The results show that the diffusivity of one-way material decreases with the increase of the measurement angle; the diffusivity of orthogonally arranged material almost keeps the same when measurement angle changes.
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Study on thermal diffusivity of materials by laser photothermal reflection technique |
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| Abstract: | A method of measuring thermal diffusivity of materials at room temperature by photothermal reflectiontechnique is described. An intensity-modulated Ar+ laser beam is used as incident light. The beam isfocused to about 1 mm diameter spot and illuminates the sample surface. HgCdTe infrared detector isused to receive photothermal signal. Using this technique, the photothermal signals are experimentallymeasured as the function of different frequencies. The thermal diffusivities can be obtained by fittingthe experimental data. On the other hand, the thermal diffusivities of one-way composite and orthogonalsymmetric arranged composites A12O3/A1 are measured in transverse, longitudinal and arbitrary directions.The results show that the diffusivity of one-way material decreases with the increase of the measurementangle; the diffusivity of orthogonally arranged material almost keeps the same when measurement anglechanges. |
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