中国光学, 2018, 11 (2): 219, 网络出版: 2018-05-29
紫外双光栅光谱仪结构设计与波长精度分析
Structure design and wavelength accuracy analysis of ultraviolet double grating spectrometer
双光栅光谱仪 波长扫描机构 波长重复性 凹面光栅 误差分析 double grating spectrometer wavelength scanning mechanism wavelength repeatability concave grating error analysis
摘要
为了满足太阳光谱在170~380 nm波段的精确观测需求, 设计了波长重复性精度优于±002 nm的紫外双光栅光谱仪。波长扫描机构是双光栅光谱仪的关键组件, 根据凹面光栅色散原理, 将光学设计指标转换为波长扫描机构设计的输入参数, 分析了影响光谱仪波长重复性精度的误差源。根据分析结果得知, 丝杠的重复定位误差是影响波长重复性的主要误差源。选用重复定位精度为±2 μm的丝杠设计了波长扫描机构, 并对光谱仪整机进行了设计。以汞灯光源对光谱仪的波长重复性指标进行了验证实验。实验结果表明, 设计的光谱仪波长重复性介于-0005~+0007 nm之间, 满足波长重复性优于±002 nm的指标要求。
Abstract
In order to observe the solar spectrum between 170 nm to 380 nm precisely, an ultraviolet double grating spectrometer with its wavelength repeatability accuracy better than ±002 nm has been designed. A wavelength scanning mechanism is the key module of the ultraviolet double grating spectrometer. Mechanical parameters are derived from optical parameters according to the grating dispersion principle. Error sources which influence the spectrometer wavelength repeatability error have been analyzed. According to the analysis results, the repeatability error of the lead screw is the main error source. A wavelength scanning mechanism has been assembled with a ±2 μm accuracy lead screw, and the spectrometer mechanism structure has been designed. Experiments have been carried out with a mercury lamp as light source to verify wavelength repeatability. The experiment results show that the wavelength repeatability of the spectrometer is between -0005 nm and +0007 nm, which is better than the required accuracy of ±002 nm.
曹佃生, 林冠宇, 杨小虎, 张子辉, 闻宝朋. 紫外双光栅光谱仪结构设计与波长精度分析[J]. 中国光学, 2018, 11(2): 219. CAO Dian-sheng, LIN Guan-yu, YANG Xiao-hu, ZHANG Zi-hui, WEN Bao-peng. Structure design and wavelength accuracy analysis of ultraviolet double grating spectrometer[J]. Chinese Optics, 2018, 11(2): 219.