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为了建立棱镜型光热偏转光谱法的理论框架,采用棱镜的光色散特性研究了激励光源对待测样品表面周期性照射情况下的探测光偏转角与光热信号之间的解析关系。得到了棱镜型样品表面周期性变化的偏转角表达式。实现结果表明,该方法比传统型光谱法具有理论模型简单、实验容易实现、分辨率高、灵敏度高等优点。
In order to establish the theoretical framework of prism-type photothermal deflection spectroscopy, the analytical relationship between the detection light deflection angle and the photothermal signal under the condition of periodic illumination of the sample surface was studied by using the light dispersion characteristics of the prism. The expression of the deflection angle of the periodic surface of the prism sample was obtained. The results show that this method has the advantages of simple theoretical model, easy experiment, high resolution and high sensitivity compared with traditional spectroscopy.