CAJ | 학술논문

针对高分辨率640×512元非制冷探测器，设计了一款6×长波红外连续变焦光学系统。该系统由6片透镜构成，工作波长为8~12μm，F数为1~1.1。根据变焦光学系统设计理论，确定了系统的机械补偿式变焦结构并构建了初始结构；对该系统的光学结构参数及凸轮变焦曲线进行了设计和优化。像质评价结果表明该系统在20~120 mm焦距范围上实现了连续平滑变焦；在30 lp/mm空间频率处，全焦距范围调制传递函数值大于0.45，接近衍射极限；全焦距范围各视场弥散斑均方根半径小于6.3μm，远小于像元尺寸17μm。实验证明该系统具有高分辨率、高变倍比、大光圈、大视场范围的特点，且像面稳定，变焦平滑，结构紧凑合理，成本相对较低。
침대고분변솔640×512원비제랭탐측기，설계료일관6×장파홍외련속변초광학계통。해계통유6편투경구성，공작파장위8~12μm，F수위1~1.1。근거변초광학계통설계이론，학정료계통적궤계보상식변초결구병구건료초시결구；대해계통적광학결구삼수급철륜변초곡선진행료설계화우화。상질평개결과표명해계통재20~120 mm초거범위상실현료련속평활변초；재30 lp/mm공간빈솔처，전초거범위조제전체함수치대우0.45，접근연사겁한；전초거범위각시장미산반균방근반경소우6.3μm，원소우상원척촌17μm。실험증명해계통구유고분변솔、고변배비、대광권、대시장범위적특점，차상면은정，변초평활，결구긴주합리，성본상대교저。
A long-wave infrared continuous 6× zoom optical system with 640×512 uncooled infrared thermal detector is designed and described. It contains 6 lenses and works at 8~12μm wavelength with the F# of 1~1.1. Based on the theory of zoom optical lenses design, a mechanical compensation structure is determined and the initial structure parameters are calculated. Moreover, the optical system parameters and zoom curves are designed and optimized. The image quality assessment shows that system zooms continuously and smoothly in all 20~120 mm focus lengthens range. The Modulation Transfer Function (MTF) values at 30 lp/mm are all above 0.45 and the spot diagrams’ RMS radius are all less than 6.3 μm which is much smaller than the detector pixel size 17 μm in all focus lengths range. The experiment proves that this zoom system has the merits of high resolution, high zoom ratio, big aperture, big field range, and has steady image plane and zooms smoothly with compact structures and low cost.