摘要
固体材料的热扩散率对于研究低温非稳态导热过程极为重要,为了研究固体材料在低温下的热扩散率,本文根据热扩散理论模型计算样品材料在不同温度时的热扩散率,在此基础上基于激光光热法对热扩散率与激光频率和相位之间的函数关系进行了数值模拟,数值计算结果与实验数据对比表明两者基本相符,研究表明激光光热法可对固体材料的热扩散率进行有效测量,样品材料在低温下热扩散率的数值模拟表明20～80 K温区样品材料热扩散率随温度变化而显著变化,80～300 K温区材料热扩散率变化较小。
Solid thermal diffusivity is very important to study unsteady heat conduction under low temperature.In order to study solid thermal diffusivity under low temperature,sample thermal diffusivity under different temperature is computed in term of thermal diffusivity theory model in the paper.Besides,function relation between laser frequency and phase lag is gained by numerical simulation.The two groups of data are approximately equal by contrasting the numerical result and experimental result.The research indicates that solid thermal diffusivity could be measured availably by laser photothermal.Numerical simulation of solid thermal diffusivity under low temperature shows that solid thermal diffusivity changes remarkably when the scope of temperature is from 20 K to 80 K,however,the change is less from 80 K to 300 K.
出处
《激光与红外》
CAS
CSCD
北大核心
2012年第2期129-132,共4页
Laser & Infrared
基金
国家自然科学基金项目(No.51076165)资助
关键词
激光光热法
热扩散率
低温工程
laser photothermal method
thermal diffusivity
cryogenic engineering
