大相对孔径长波连续变焦红外光学系统设计

Design of long-wavelength low F/# continuously zooming infrared optical system

提出一种大相对孔径长波连续变焦红外光学系统的设计方法,利用变焦原理和光学设计软件得到系统结构及其参数。该光学系统在变焦过程中相对孔径可变,F数最小可达0.85。系统主要光学参数F/#为0.85～1,变倍比为4.5∶1,工作波长为8～12μm,采用384×288元非制冷焦平面探测器。具有分辨率高、像质好、能量利用率高、变焦轨迹平滑等特点,满足工程设计要求。

A long-wavelength low F/# continuously zooming infrared optical system is introduced. Using zooming prin- ciple and optical design software, the optical system＇ s structure and parameters are obtained. The relative aperture is variant during the zoom process, F/# is 0. 85 - 1, zoom ratio is 4. 5 ： 1, operating wavelength is 8 - 12 μm, and a 384 × 288 uncooled FPA detector is used. The system has high resolution, excellent images quality and smooth zoom locus. The design meets the requirements of the practical engineering.