宽光谱高分辨率的分光光度计光学系统设计

Design of Spectrophotometer Optical Systems with Broad Spectrum and High Resolution

为了使分光光度计在宽光谱范围内能够实现高分辨率,采用旋转光栅方式设计了基于非对称式切尔尼-特纳(Czerny-Turner)型结构的光学系统。根据分光光度计的工作原理和几何像差理论,并考虑中心和边缘波长的影响,计算了分光系统各光学元件的特征参数和结构参数。以光谱分辨率为主要目标,通过Zemax软件对光学系统进行仿真与优化设计,确定最佳光路结构,并采用多重结构模拟光栅旋转以实现对宽波段的扫描。仿真结果显示,系统在300~1000 nm光谱范围内分辨率均远优于0.1 nm。通过搭建实验系统验证了分光光度计的光谱分辨率能够达到0.1 nm的技术指标。因此,所设计的分光光度计光学系统对宽光谱高分辨率的光谱仪器设计具有一定的参考价值。

To enable a spectrophotometer to achieve high resolution across a broad spectral range,an optical system utilizing an asymmetric CzernyTurner configuration is developed,featuring a rotating grating.This system’s design adheres to the working principle of the spectrophotometer and the theory of geometric aberration while accounting for the effects on central and edge wavelengths.The characteristic and structural parameters of each optical component in the spectroscopic system are accurately determined.Focusing on spectral resolution,the optical system is simulated and optimized using Zemax software to determine the optimal optical path structure.The multiconfiguration is used to simulate the grating rotation,thereby allowing for the scanning of wide wavelength bands.The simulations indicate that the system’s resolution consistently surpasses 0.1 nm within the 300‒1000 nm spectral range.The experimental setup confirms that the spectrophotometer’s spectral resolution attains a technical specification of 0.1 nm.Consequently,The designed spectrophotometer optical system serves as a valuable reference for the development of highresolution spectroscopic instruments capable of operating across a broad spectrum.