大孔径宽光谱变焦镜头设计

Design of large-aperture and wide-spectrum zoom lens

在高压电线运输电力过程中容易发生电晕放电现象,存在安全隐患,因此,进行电晕放电的检测十分必要。利用日盲紫外镜头进行电晕检测是检测手段之一。基于Zemax多重组态功能设计了一款大孔径宽光谱变焦镜头,目的是配合变焦范围为90 mm~165 mm变焦距紫外镜头应用,可在电晕放电信号检测时,全天候、快速准确找出损坏线路的位置。该镜头采用4组元、近对称结构型式,F数为1.4,可变焦范围在30 mm~55 mm,工作光谱波段为400 nm~850 nm,空间频率100 lp/mm处全视场MTF≥0.4,最大畸变≤±3%,均采用标准球面设计,系统总长为110 mm,适用于0.847 cm(1/3英寸)CCD,能较好地矫正各类像差,满足各零件基本加工工艺要求。

In the process of high-voltage power line transportation, the corona discharge is easy to occur, which has potential safety hazards. Therefore, it is necessary to detect the corona discharge. Corona detection using solar blind ultraviolet(UV) lens is one of the detection methods. Based on the multiple configuration function of Zemax, a large-aperture and wide-spectrum zoom lens was designed to cooperate with the application of UV lens with the zoom range of 90 mm~165 mm, which could quickly and accurately find out the position of the damaged line in all-weather conditions when detecting the corona discharge signal. The four components and near-symmetrical structure were adopted by the proposed large-aperture and wide-spectrum zoom lens with the F number of 1.4, the zoom range of 30 mm~55 mm, the working spectral band of 400 nm~850 nm, the full field MTF≥0.4 at spatial frequency of 100 lp/mm, and the maximum distortion≤±3 %, all adopting standard spherical design, total length of the system is 110 mm, which is suitable for 0.847 cm(1/3 inch) CCD, and can better correct all kinds of aberrations as well as meet the basic processing requirements of each part.