机载复杂红外光学系统无热化补偿方法研究

为提高机载红外光学系统的环境适应性,保证红外系统在机载动态环境中能够稳定成像,提出一种无热化加权温度补偿方法,根据每个光学元件和间隔温度变化对系统成像影响程度的不同赋予不同的权重,建立在不均匀变化温度场中光学系统的加权温度补偿模型。利用光学设计软件仿真分析,工作温度在-50～+60℃范围内仿真误差<0.5%。建立了无热化光学系统的测试平台,对无热化加权温度补偿方法仿真分析结果进行实验测试。研究结果表明,加权温度补偿模型实用性强、精度高。在机载环境温度范围内,各项误差能够控制在1.5%,满足机载环境复杂红外光学系统的被动无热化的要求。

Athermalization Compensation of Complex Airborne Infrared Optical System

A weighted temperature compensation method of athermalization was proposed to improve the adaptability of airborne infrared optical system and ensure steady image quality of the IR system in complex airborne environment.A weighted temperature compensation model for optical system under nonuniform temperature variation field was established by assigning the lenses and the spaces different weights according to their different impacts on image quality when temperature changes.The simulation and analysis made though an optical design software showed that the simulation error was less than 0.5% when the operating temperature ranged from -50 to 60 ℃.A platform was established to test the athermal optical system.The result showed that the weighted temperature compensation model was well practicable with high accuracy.The errors were controlled to be within 1.5% in the range of airborne temperaturewhich can satisfy the requirements of passive athermalization in complex airborne infrared optical system.