Luo Biao, Wen Zhi-Yu, Wen Zhong-Quan, Zeng Tian-Ling
Key Laboratory of Optoelectronic Technology and System of Ministry of Education, Chongqing University, Chongqing 400044, China.
Guang Pu Xue Yu Guang Pu Fen Xi. 2012 Jun;32(6):1717-21.
Ultraviolet-spectrum technology is a kind of low signal and multianalysis technology. For taking full advantage of spectral information and reducing the volume of spectrometer, we used high efficiency spectroscopy structure based on concave grating. Based on concave grating theory and optic design software ZEMAX, a flat field concave grating for ultraviolet spectrophotometer was designed from primary structure, which relied on global optimization of the software. The contradiction between wide spectrum bound and limited spectrum extension was resolved, aberrations were reduced successfully, spectrum information was utilized fully, and the optic structure of spectrometer was highly efficient. For better preference of this spectrophotometer, after get the structure parameter, combine grating fabrication condition with practice working condition, grating diffractive theory, holographic optics theory and software PCG rate was used for diffraction efficiency design and improve. A paradigm of flat field concave grating is given, it works between 190 nm to 410 nm, the diameter of the concave grating is 20 mm, and F/# is 0.21. The design result was analyzed and evaluated. It was showed that if the slit source, whose width is 50 microm, is used to reconstruction, the theoretic resolution capacity is better than 3 nm.
紫外光谱技术是一种低信号且多分析的技术。为了充分利用光谱信息并减小光谱仪的体积，我们采用了基于凹面光栅的高效光谱结构。基于凹面光栅理论和光学设计软件ZEMAX，从初始结构开始设计了一种用于紫外分光光度计的平场凹面光栅，这依赖于该软件的全局优化。解决了宽光谱范围与有限光谱扩展之间的矛盾，成功减小了像差，充分利用了光谱信息，并且光谱仪的光学结构高效。为了更好地优化这种分光光度计，在获得结构参数后，将光栅制造条件与实际工作条件相结合，利用光栅衍射理论、全息光学理论以及软件PCG rate进行衍射效率设计和改进。给出了一种平场凹面光栅的范例，其工作波长范围为190nm至410nm，凹面光栅直径为20mm，F/#为0.21。对设计结果进行了分析和评估。结果表明，如果使用宽度为50微米的狭缝光源进行重构，理论分辨率优于3nm。
