【摘要】 针对一些光轴稳定性要求较高的高空使用战斗机挂载光电系统，分析了光学系统设计中提高光轴稳定性的几点要素，给出了消热差公式的条件，推导了景深公式，并给出了四种提高途径：采用较大温差范围的光学全被动补偿无热化设计、降低公差灵敏度、提高结构件的刚度和强度、使用景深调焦机构(满足较大作用距离的机载高低空使用要求)。介绍了一种小型机载近红外无热化变焦系统的设计思路。该系统采用光学补偿，有4个透镜组(最后一组为景深调焦机构),在-55～70℃温度范围内均具有较好的像质、较宽松的公差特性和较好的光轴稳定性。更多还原

【Abstract】 In view of the photoelectric system of some high-altitude fighter aircraft with high requirement of optical axis stability, several elements to improve the stability of optical axis in the design of optical system are analyzed, and the condition of heat dissipation formula is given in this paper. The formula of depth of field is deduced, and four ways to improve the stability of optical axis are obtained. The design of optical full passive compensation without heating in large temperature range, the reduction of tolerance sensitivity, the improvement of stiffness and strength of structural parts and the use of field depth focusing mechanism meet the requirements of airborne high and low space use with large working distance. In addition, the design idea of a miniaturized airborne NIR athermal zoom system is introduced. The optical compensation and four lens groups are used in the system. The last group is the depth-of-field focusing mechanism. The system has good image quality, loose tolerance characteristics and good optical axis stability in the temperature range from-55℃ to 70℃.更多还原