简单介绍了WGD-3型组合式多功能光栅光谱仪的基本光学原理,以及光栅衍射理论、基于溶液对光的选择性吸收而建立起来的一种分析方法、朗伯-比尔定律。获得了硫酸铜溶液样品的吸光度、透过率、能量曲线图。 A brief introduction to the basic optical principle of the WGD-3 combined multi-function grating spectrometer and the grating diffraction theory, an analytical method based on the selective absorption of light by solution, is Lambert-Beer’s law. The absorbance, transmittance and energy curve of copper sulfate solution samples were obtained.