The theoretical and experimental foundations of some of the most common frequency-domain photothermal techniques for measuring thermophysical properties of materials are presented. Limitations of these methodologies when used without attention to satisfying the appropriate validity conditions are discussed and their consequences in providing inaccurate and often conflicting quantitative measurements are examined in the form of several case studies in photothermal thermophysics. The importance of adherence to experimental setup configurations and signal generation conditions consistent with photothermal theoretical models used to extract thermophysical properties (diffusivity, effusivity, optical absorption coefficient) is highlighted as an essential requirement for reliable thermophysical measurements.

介绍了一些用于测量材料热物理性质的最常见频域光热技术的理论和实验基础。讨论了这些方法在使用时不注意满足适当的有效性条件的局限性，并以光热热物理中的几个案例研究的形式检查了它们在提供不准确且经常相互矛盾的定量测量方面的后果。强调遵守与用于提取热物理特性（扩散率、射流率、光吸收系数）的光热理论模型一致的实验装置配置和信号生成条件的重要性，这是可靠的热物理测量的基本要求。