CAJ | 학술논문

对于工作环境温度在-40~60℃之间的长波红外折射光学系统来说,由于红外光学材料受温度变化影响非常大,光学系统必须进行无热化设计.在介绍了无热化系统的种类,分析了温度变化对红外光学系统的影响基础之上,基于非制冷型焦平面探测器,设计了工作在长波红外8~12μm,F#为2,视场角为6.8°的摄远型物镜系统.采用添加棱镜的方法,使系统在不添加特殊面型的情况下达到无热化的目的,同时使系统结构紧凑,摄远比达到0.69.透镜面型均为标准球面,利于加工、装调、检测.设计结果表明,光学系统的调制传递函数在每个规定温度下均能接近衍射极限,满足了设计要求.
대우공작배경온도재-40~60℃지간적장파홍외절사광학계통래설,유우홍외광학재료수온도변화영향비상대,광학계통필수진행무열화설계.재개소료무열화계통적충류,분석료온도변화대홍외광학계통적영향기출지상,기우비제랭형초평면탐측기,설계료공작재장파홍외8~12μm,F#위2,시장각위6.8°적섭원형물경계통.채용첨가릉경적방법,사계통재불첨가특수면형적정황하체도무열화적목적,동시사계통결구긴주,섭원비체도0.69.투경면형균위표준구면,리우가공、장조、검측.설계결과표명,광학계통적조제전체함수재매개규정온도하균능접근연사겁한,만족료설계요구.
Athermal design is necessary to design a LWIR optical system for working under temperature range of -40-+60℃, because the infrared optical materials could transform extremely with the change of temperature. On the basis of introduction of athermal system and analysis on the effects of optical elements, an infrared telephoto objective lens was designed in the way of optical passive compensating, which working waveband was 8-12μm long wave infrared band, F# was 2, the field of view was 6.8°, uncooled focal plane array was adopted. A prism was added in the system to achieve athermalization and compact structure without adding a special surface, the telephoto ratio of this system was 0.69. All of the surfaces were designed to be standard sphere, which was of benefit to processing, alignment and testing. The result of design indicates that the optical transfer functions are close to the diffraction limit in the required temperature range and the design requirement is met.