一、引言传统的光谱技术是直接检测电磁辐射,即检测物质与入射光相互作用所吸收或反射的光子通量。例如吸收光谱和漫散射光谱,在研究物质的化学性质和物理性质上有着广泛的用途。但他们对不透明物质和高反射、高散射性物质的研究及对分子激发态弛豫过程(包括禁戒跃迁)的研究却受到限制。光声光谱则是另一种类型的光谱技术,它利用光声效应检测物质与入射光相互作用而引 I. INTRODUCTION The traditional spectroscopic technique is the direct detection of electromagnetic radiation, which is the photon flux absorbed or reflected by the detection material and the incident light. Such as absorption spectroscopy and diffuse scattering spectroscopy, have a wide range of applications in the study of the chemical and physical properties of materials. However, their research on opaque materials and highly reflective and highly scattering materials, as well as on the relaxation process of molecular excitations (including forbidden transitions) are limited. Photoacoustic spectroscopy is another type of spectroscopic technique that uses the photoacoustic effect to detect the interaction of an object with incident light