激光光热位移光谱法对重油类的表面研究

Study of heavy hydrocarbon surface by means of laser photothermal displacement spectroscopy

1 引言 激光光热位移光谱法是一项高灵敏度高分辨率和无损伤无接触的新型激光光谱探测方法,已成功地应用于表层、亚表层和薄膜的光热特性研究。它的研究对象主要是固体样品。本工作把光热位移光谱法扩展到液体样品。

Optical and thermal properties of heavy hydrocarbon surface is studied by laser photothermal displacement spectroscopy for the first time. The effects of experimental parameters on the photothermal displacement signal are considered in detail. A new method for measuring the thermal diffusivity, the characteristic parameters of focused laser beam and the focal length of the focusing lens is introduced. The result is in agreement with the theoretical calculation.