光声方法测量金属材料的热扩散率及热溢出率

Thermal Diffusivities and Thermal Effusivities of the Metal Materials Studied by the Photoacoustic Technique

利用固体光声技术开展了对金属材料热扩散率及热溢出率的测量研究。首先,根据简化的R-G理论建立一维固体光声池检测材料热性能的理论模型,搭建了相应的光声测试系统;然后检测了紫铜等标准样品的热扩散率及热溢出率,完成了实验方法及系统的校准和验证;最后,对常见几种金属样品的热扩散率及热溢出率进行了检测。研究结果显示,利用固体光声技术可以准确测量金属材料的热扩散率及热溢出率,测量结果与参考值的相对误差均在3%以下。

The thermal diffusivities and thermal effusivities of metal materials have been measured by the Photoacoustic Technique. Firstly, based on the simplified R-G model, the one-dimensional theory of photoacoustic was analyzed. The corresponding experimental system has been set up, by which the photoaoustic signal of the solid photoacoustic cell can be obtained. Secondly, the thermal diffusivity and thermal effusivity of reference samples were measured, by which the experimental system can be validated. Finally, the diffusivities and effusivities of several kinds of metal material were studied by the photoacoustic cell system. Comparing with the corresponding reference data, it is shown that the photoacoustic techniques can be used to measure both the thermal diffusivity and effusivity of metal materials effectively. The relative error between the experiment data and the reference data are less than 3%.