CAJ | 학술논문

随着红外热成像系统的不断发展，对红外光学系统也提出了更高的要求。为了满足红外探测器在军事方面的广泛应用，整机系统对高性能、大变倍的红外连续变焦光学系统的需求日益增强。针对高端中波制冷型640×512凝视焦平面探测器，设计了结构紧凑、性能优良的高清晰大变倍比机械补偿连续变焦光学系统。该系统工作波段为3.7~4.8μm，F数为4，变倍比为35：1，变焦范围为15~550 mm。该系统运用“平滑换根”理论，实现了超大变倍比的连续变焦光学系统设计，并且采用二次成像以及45o反射镜对光路进行U型折叠，在实现了冷屏效率100豫的同时有效控制了该系统的横向和径向尺寸。采用光学设计软件CODE V进行了仿真计算和像质评价，并绘制了该系统的变焦曲线。设计结果表明，该连续变焦光学系统具有分辨率高、变倍比大、结构紧凑、在全焦距范围内成像质量优良并且变焦轨迹平滑等优点，能够与高性能中波红外探测器匹配用于高端红外热成像系统。
수착홍외열성상계통적불단발전，대홍외광학계통야제출료경고적요구。위료만족홍외탐측기재군사방면적엄범응용，정궤계통대고성능、대변배적홍외련속변초광학계통적수구일익증강。침대고단중파제랭형640×512응시초평면탐측기，설계료결구긴주、성능우량적고청석대변배비궤계보상련속변초광학계통。해계통공작파단위3.7~4.8μm，F수위4，변배비위35：1，변초범위위15~550 mm。해계통운용“평활환근”이론，실현료초대변배비적련속변초광학계통설계，병차채용이차성상이급45o반사경대광로진행U형절첩，재실현료랭병효솔100예적동시유효공제료해계통적횡향화경향척촌。채용광학설계연건CODE V진행료방진계산화상질평개，병회제료해계통적변초곡선。설계결과표명，해련속변초광학계통구유분변솔고、변배비대、결구긴주、재전초거범위내성상질량우량병차변초궤적평활등우점，능구여고성능중파홍외탐측기필배용우고단홍외열성상계통。
For advanced 640 í512 cooled staring focal plane array (FPA) detector, a mechanical compensation continuous zoom optical system with greater than 30í zoom range was presented based on the requirements of infrared thermal imager. The zoom system provided continuous changed in the field of view from the narrow field of view to the wide field of view. The largest constraint that used to exist developed a strategy that would allow the zoom focus to be continuous. The large zoom range created the condition of the zoom groups moving through the 1í magnification case . Discontinuities about this 1í magnification point was well documented in the paper . The spectral band of the system was 3 . 7-4.8μm, and F number was 4.0. It realized 15- 550 mm continuous zoom with a smooth zoom path and provided high image quality within the whole zoom range. Moreover, detailed design and image quality were given by CODE V optical design software. By the virtue of secondary imaging structure and tow reflectors, it has 100% cold shield efficiency and can reduce the transverse and radial size of system. The design results prove that the zoom system has high resolution, large zoom range, small size and excellent image quality and has also been found to be capable of accommodating advanced infrared thermal imager.