切尔尼-特纳（Czerny-Turner, C-T）光谱仪是光栅光谱仪中常用的光谱仪器。其结构紧凑，无非球面镜，常被用于单色仪和光谱辐射计中。对于成像光谱仪，像散是影响其空间分辨和光能利用的主要像差。就非平行光束光栅照明像散校正方法进行了理论分析和实验验证，提出会聚和发散光栅照明C-T成像光谱仪都可以进行像散校正，其根本取决于光栅入射角和衍射的余弦平方比大于或小于1，大于1对应发散照明消像散，小于1则对应会聚照明消像散。

Czerny-Turner(C-T)spectrometer usually been used monochromators and spectral radiometers due to its compact structure and spherical mirrors. However, astigmatism greatly confines C-T spectrometer used in imaging spectrometers. Astigmatism-free methods were analyzed theoretically and verified experimentally under non-parallel grating illumination. As a result, astigmatism of C-T spectrometer can be corrected under convergent or divergent grating illumination. When the cosine square ratio of grating incidence to difference angle was more than 1, divergent illumination can correct astigmatism. Conversely, when it was less than 1, convergent illumination can correct astigmatism.