CAJ | 학술논문

分析了大相对孔径、长焦距折射式光学系统的像差特点，针对一款口径300 mm，焦距540 mm ，波段范围500~850 nm ，视场角2°的折射式成像物镜进行了设计。首先根据系统的像差特点，针对二级光谱，选择了Petzval型作为初始结构，并进行了复杂化，形成大空气间隔的三组元形式，利于像差的校正和后组元件尺寸的减小；而后针对使用波段对玻璃材料的部分色散P和阿贝数V值进行了修正，并绘制了P-V图，从中选择了具有一定二级光谱校正能力并性能优良的玻璃材料。最终系统的二级光谱达到了0.06 mm ，表明具有较好的复消色差性能。设计结果系统在相机Nyquist频率(39 lp/mm )处各视场MTF大于0.8，80%能量集中在直径为8μm的圆内，小于一个象元尺寸，最大畸变小于0.1%，各项指标均满足设计要求。
분석료대상대공경、장초거절사식광학계통적상차특점，침대일관구경300 mm，초거540 mm ，파단범위500~850 nm ，시장각2°적절사식성상물경진행료설계。수선근거계통적상차특점，침대이급광보，선택료Petzval형작위초시결구，병진행료복잡화，형성대공기간격적삼조원형식，리우상차적교정화후조원건척촌적감소；이후침대사용파단대파리재료적부분색산P화아패수V치진행료수정，병회제료P-V도，종중선택료구유일정이급광보교정능력병성능우량적파리재료。최종계통적이급광보체도료0.06 mm ，표명구유교호적복소색차성능。설계결과계통재상궤Nyquist빈솔(39 lp/mm )처각시장MTF대우0.8，80%능량집중재직경위8μm적원내，소우일개상원척촌，최대기변소우0.1%，각항지표균만족설계요구。
The aberration characteristics of refractive optical system with large relative aperture and long focal length were analyzed. And a lens with 300 mm diameter, 540 mm focal length, 500-850 nm operating wavelength range, and 2° field of view was designed. First, as the secondary spectrum was the most prominent aberration, the Petzval form was chose as the initial configuration, and after complication, the configuration with three components with large air space was used, which was good for aberration correction and element size reduction. Then the partial dispersion and abbe number of typical glasses were recalculated and modified for the used wavelength, and P-V map is draw, then the glasses with some secondary spectrum correction ability and fine optical performance were chose. Finally the secondary spectrum of the system is reduced to 0.06 mm, which show that the system is apochromat. The design results demonstrate that the MTF of all field of view at Nyquist frequency 39 lp/mm is higher than 0.8, and 80% energy of the system encircled in 8um, which is less than a pixel size, and the distortion is less than 0.1%. All indexes satisfy the commands of system.