| 利用激光光热技术研究材料应力对热扩散率的影响 |
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| 引用本文： | 王培吉,张仲,范素华. 利用激光光热技术研究材料应力对热扩散率的影响[J]. 中国激光, 2003, 30(3): 252-254 |
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| 作者姓名： | 王培吉 张仲 范素华 |
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| 作者单位： | 济南大学理学院,山东,济南,250022 |
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| 摘 要： | 根据光热光谱技术中的激光光热平行检测技术测量了材料具有应力时的热扩散率 ,根据所检测到的光热信号的振幅 ,由非线性拟合 ,确定出材料的热扩散率 ;由于入射光束移动的方便性 ,可实现对材料的点点测量 ,进而测量了材料在应力作用区域不同点上的热扩散率 ,结果发现当材料内存在应力时 ,造成材料的热扩散率变小 ,且随应力起伏变化而变化。同时设计了数据采集软件与双差电路 ,提高了测量精确度
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| 关 键 词： | 激光技术 热扩散率 光热检测 应力 |
| 收稿时间： | 2001-12-20 |
Influence of Stress on Thermal Diffusivity by Laser Photothermal Technique |
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| Wang Pei ji,Zhang Zhong,Fan Su hua. Influence of Stress on Thermal Diffusivity by Laser Photothermal Technique[J]. Chinese Journal of Lasers, 2003, 30(3): 252-254 |
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| Authors: | Wang Pei ji Zhang Zhong Fan Su hua |
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| Abstract: | A method of measuring thermal diffusivity by laser photothermal parallel detection technique is introduced when materials possess stress. According to amplitude of photothermal signal, thermal diffusivity can be determined by nonlinear fitting. The results show that diffusivity become small under stress existing. The software of collecting data and the double difference circuit are designed, and the measurement accuracy is raised. |
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| Keywords: | laser technique thermal diffusivity photothermal detecting stress |
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