CAJ | 학술논문

利用折/衍混合透镜实现了宽温度范围双视场变焦系统的光学被动无热设计.系统工作波段为3耀5滋m,使用320伊240红外制冷探测器,像元大小为30滋m伊30滋m,焦距为400 mm和800 mm两档,F数分别为2和4.两系统通过机械结构改变冷光栏大小分别实现100﹪冷光栏效率.在两档共用组份采用一片折衍混合透镜,对双视场系统两焦距位置消热差,实现了一个衍射面对两档系统的无热化设计,结构简单.设计结果表明:在-40耀60益温度范围内,空间频率18 lp/mm处系统MTF值接近衍射极限,成像质量良好,实现了双视场变焦系统的无热化设计.
이용절/연혼합투경실현료관온도범위쌍시장변초계통적광학피동무열설계.계통공작파단위3요5자m,사용320이240홍외제랭탐측기,상원대소위30자m이30자m,초거위400 mm화800 mm량당,F수분별위2화4.량계통통과궤계결구개변랭광란대소분별실현100﹪랭광란효솔.재량당공용조빈채용일편절연혼합투경,대쌍시장계통량초거위치소열차,실현료일개연사면대량당계통적무열화설계,결구간단.설계결과표명:재-40요60익온도범위내,공간빈솔18 lp/mm처계통MTF치접근연사겁한,성상질량량호,실현료쌍시장변초계통적무열화설계.
Hybrid refractive-diffractive design offers a new approach for athermalization design in wide temperature range. In this paper, working wavelength is in 3-5μm. For cool 320í240 infrared detector, pixel size 30μmí30μm, this system can realize 400 mm and 800 mm dual filed-of-view and the F-number of 2/4 respectively. Two systems both can obtain the cold shield efficiency of 100﹪ though controlling machine structure. A diffractive surface was introduced in the shared part of two different focal length position. It achieve the athermal design using only one diffractive surface. The evolution of the system was given in the temperature range -40-60℃. The results show that at the spatial frequency of 18 lp/mm the MTF approach to the diffractive limitation.