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本文利用光热偏转光谱法理论,建立了泵浦激励下固体材料温度变化的一维温度场模型,用光热偏转光谱法的基本原理求解热传导方程得到了固体中的温度场分布,研究了样品中的光热偏转信号随时间的变化规律。探头了探测光距离对光热偏转光信号的影响。此外,对阶跃光激励下固体材料温度变化与光热偏转光信号的关系进行了初步分析。结果表明,随着探测光离样品表面距离的增加,信号的变化幅度不断下降。这对光热偏转光谱法的无损检测、医药、物理、化学和新材料等领域具有指导意义。
Based on the theory of photothermal deflection spectroscopy, a one-dimensional temperature field model of temperature variation of solid material under pump excitation is established. The temperature field distribution in solid is obtained by solving the heat conduction equation by the basic principle of photothermal-deflection spectroscopy. In the light thermal deflection signal changes with time. Probe probe light distance on the light thermal signal effects. In addition, a preliminary analysis of the relationship between the temperature changes of solid material and the photo-thermal deflection optical signal under the step light excitation is carried out. The results show that with the increase of the distance of the probe light from the surface of the sample, the amplitude of the signal decreases continuously. This is of guiding significance to the nondestructive testing of photothermal deflection spectroscopy in the fields of medicine, physics, chemistry and new materials.