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由于所需测量的光谱范围较宽(276~700 nm),而CCD探测器的接收面尺寸较小(14.3 mm×10.5 mm),根据所选用的平面光栅元件参数,采用传统的车尔尼-特纳型结构是无法满足的。基于该结构,利用光线相对光栅的入射角和衍射角与光栅转角的关系,提出了使用两块反射式平面光栅进行光谱分离的方法。通过理论计算,确定了两段光谱范围和两光栅的旋转及俯仰角度,采用ZEMAX软件建立多重结构,分别设置两块光栅的位置和波长参数,对光学系统进行了模拟分析和优化。结果表明,在像面上得到了两条谱面线展宽为14mm,中心间距8mm的光谱带,光谱分辨率优于1nm,各像差得到了充分校正,满足设计指标要求,很好地解决了宽光谱和探测器接收面尺寸之间的矛盾。
Due to the wide spectral range (276 ~ 700 nm) to be measured and the smaller receiving surface size of the CCD detector (14.3 mm × 10.5 mm), the traditional Czerny- Turner structure is not satisfied. Based on this structure, a method of spectral separation using two reflective planar gratings is proposed by using the relation between the incident angle of the light relative grating and the diffraction angle. Through the theoretical calculation, the two spectral ranges and the rotation and pitch angles of the two gratings are determined. The ZEMAX software is used to establish the multiple structures. The position and wavelength parameters of the two gratings are set respectively. The optical system is simulated and optimized. The results show that on the image plane, two spectral bands with spectral line broadening of 14mm and center spacing of 8mm are obtained, the spectral resolution is better than 1nm, and the aberrations are fully corrected to meet the design requirements Conflicts between the wide spectrum and the size of the detector receiving surface.