CAJ | 학술논문

针对中波制冷型640伊512凝视焦平面探测器,设计了一个大变倍比中波红外连续变焦光学系统.该系统采用三次成像技术,其工作波段为3.7~4.8滋m,F数为4,变倍比为30:1,可实现23~701mm连续变焦,变焦轨迹平滑,满足100%冷光阑效率.该系统采用硅、锗和硒化锌三种红外材料,通过引入非球面和衍射面来校正系统的轴外像差和高级像差.系统在30 lp/mm处,全焦距范围内调制传递函数(MTF)均在0.15以上,接近衍射极限.设计结果表明,大变倍比中波红外连续变焦光学系统具有变倍比大、分辨率高、结构紧凑、像质好等优点.
침대중파제랭형640이512응시초평면탐측기,설계료일개대변배비중파홍외련속변초광학계통.해계통채용삼차성상기술,기공작파단위3.7~4.8자m,F수위4,변배비위30:1,가실현23~701mm련속변초,변초궤적평활,만족100%랭광란효솔.해계통채용규、타화서화자삼충홍외재료,통과인입비구면화연사면래교정계통적축외상차화고급상차.계통재30 lp/mm처,전초거범위내조제전체함수(MTF)균재0.15이상,접근연사겁한.설계결과표명,대변배비중파홍외련속변초광학계통구유변배비대、분변솔고、결구긴주、상질호등우점.
For medium wave cool 640í512 detector with staring focal plane array, a MWIR continuous zoom optical system with large zoom range was designed. The optical system imaged thrice. The operating wavelength range was 3.7-4.8μm, F number was 4 and the zoom ratio was 30:1. The optical system could realize 23-701 mm continuous zoom and meet 100% cold shield efficiency with smooth zoom locus. Three infrared materials of Si, Ge and ZnSe were used in the optical system. The system could correct the off axis aberration and higher order aberration by leading the aspheric surface and the diffractive surface. The MTF was above 0.15 within the whole focal range at the spatial frequency of 30 lp/mm and it approached the diffraction limit. The results show that the MWIR continuous zoom optical system has large zoom ratio, high resolution, small volume and excellent image quality.