光学被动式和机电式组合消热差方法的研究

Combination of optical passive and mechanical-electrical athermalisation

摘要: 为了解决机电式消热差中光学系统热差太大，透镜的移动不能补偿温度变化引起的像面漂移问题，提出光学被动式和机电式消热差相结合的无热设计方法。该方法先通过光学被动消热差方法得到合理的消热差透镜组合，使热差控制在较小的范围内；然后通过机电消热差的方法消除剩余热差。在(-40～60)℃温度范围内，利用该方法对波长为(7.5～10.5)m的双视场红外光学系统进行无热化设计，借助传递函数(MTF)对设计结果进行评价，说明该设计在整个温度范围内满足系统像差要求。

Abstract: A combination of passive optical athermalisation and mechanical-electrical athermalisation is proposed to overcome thermal effect, which may otherwise cause the drift of image plane. Optical athermalisation is used to obtain feasible athermalised lens group, which control the error in a small range. Then mechanical-electrical athermalisation is used to eliminate the remaining error. An infrared system operating at wavelength (7.5～10.5)m with two field of view was designed, and it functions properly at -40℃ to 60℃.