摘要
Abstract
As the infrared imaging optical system is used more and more widely with higher requirement to miniaturization, an athermal optical design for a compact medium wave infrared imaging system has been proposed. At the beginning, the optical parameters were analyzed and calculated based on the requirements, the vertical size of system was shortened by utilizing Casey Green system in accordance with the parameter requirement, and then the relay lens set was used to correct the aberration. Considering the lower processing cost of the lens, a full global surface type was adopted for the relay lens set, which finally shortened the size between the secondary lens of Casey Green system and the infrared detector by 47 mm, making the system sufficiently compact. Through the rational selection of material and distribution of focal power, the optical passive differential equation of heat elimination was derived and the primary structure of the system was calculated consequently. By means of optimization of Zemax optical design software, the heat dissipation results, such as 3.7-4.8 μm of wave, field of view of 3°×3° and the temperature range of -40℃-+50℃, were eventually realized. Moreover, in a place with space frequency of 17 lp.mm-1, the optical modulation transfer function (MTF) values of each field of view were all greater than 0.5.关键词
中波红外成像/卡塞格林系统/光学设计/紧凑型/消热差Key words
MW infrared imaging infrared/Casey Grain system/optical design/compact/athermalization分类
信息技术与安全科学
