可见近红外宽波段复消色差高光谱物镜设计

摘要

An apochromatic objective with a middle field of view and a large relative aperture was designed to satisfy the imaging demand of hyper-spectral imager from 365 nm to 1000 nm bands.Based on the primary aberration theory, the dispersion properties of glass materials in the visible and near infrared bands were analyzed,which provides a ref-erence for the selection of glass materials in optical design.The results of optical design show that through the rational use of fluorine crown glass,chromatic aberration has been corrected successfully,and secondary spectrum is only 0.014 mm.The objective has a focal length of 18 mm,a relative aperture of 1 :2.4 and a field of view of 30°,and the imaging quality is close to the diffraction limit,which meets the design requirement of hyper-spectral imager.%为满足高光谱成像仪在365 ~1000 nm波段范围的成像需求,设计了一款中等视场角、大相对孔径的复消色差物镜.从初级色差理论出发,分析了可见近红外波段的玻璃材料的色散特性,为光学设计选择玻璃材料提供了理论依据.设计结果表明:通过对低色散氟冕玻璃的合理使用,物镜在宽波段内的色差得到了良好校正,二级光谱仅为0.014 mm.物镜焦距18 mm,相对孔径1:2.4,视场角30°,成像质量接近衍射极限,满足高光谱成像仪的设计要求.