An optical pump-probe technique for measuring the thermal conductivity of liquids
An optical pump-probe technique for measuring the thermal conductivity of liquids
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DOI：
10.1063/1.2937458
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发表时间：
2008-06-01
影响因子：
1.6
通讯作者：
Chen, Gang
中科院分区：
文献类型：
--
作者：
Schmidt, Aaron;Chiesa, Matteo;Chen, Gang
提出了一种测量液体导热系数的泵浦-探测光学技术。该技术使用反射几何形状，其不依赖于液体的光学性质，并且需要少至单个液滴来产生结果。给出了层状介质中双向热流的解析解，包括同轴高斯激光光斑径向热流、界面热阻和多脉冲激光累积的影响。此外，几个实验的改进，在以前的泵浦探测配置进行了描述，从而在一个改进的信号噪声比和较小的误差，在长的阶段延迟时间。该技术适用于一系列液体和固体。结果与文献值吻合良好。(c)2008年美国物理学会。
We present a pump-probe optical technique for measuring the thermal conductivity of liquids. The technique uses a reflective geometry which does not depend on the optical properties of the liquid and requires as little as a single droplet to produce a result. An analytical solution is given for bidirectional heat flow in layered media, including the effects of radial heat flow from coaxial Gaussian laser spots, thermal interface resistances, and the accumulation of multiple laser pulses. In addition, several experimental improvements over previous pump-probe configurations are described, resulting in an improved signal to noise ratio and smaller errors at long stage delay times. The technique is applied to a range of liquids and solids. Results are in good agreement with literature values. (c) 2008 American Institute of Physics.