红外双波段制冷型变焦Offner型光谱成像系统设计
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关键词：光学设计；Offner;红外双波段；制冷型；变焦系统中图分类号：TP394.1；TH691.9 文献标志码：A doi：10.37188/CO.2025-0080 CSTR：32171.14.CO.2025-0080
Abstract： With the breakthrough progress of mid-wave and long-wave infrared hyperspectral imaging technology， the military hyperspectral imaging system， with its unique feature recognition capability and covert reconnaissance advantages， has demonstrated significant strategic value in the field of modern battlefield situational awareness. In this study， a dual-band Offner-type spectral imaging system operating in the midwave infrared （ 3.7-4.8μm⟩ ）andlong-waveinfrared （7.7-9.5μm） isdesigned for aerial detection applicationsbased on a 320×240 -pixel dual-color cooled infrared detector.The systemadopts a hybrid refractive and refractive-reflective optical structure， and realizes a three-field-of-view switching zoom function of 32mm ， 200mm and 800mm . The optical system adopts the Offner spectroscopic structure， which effectively suppresses the primary aberration of the system; secondly， through the introduction of the secondary imaging relay system， it achieves 100% cold diaphragm matching and significantly reduces the cold reflection effect. Experimental tests show that the system exhibits excellent imaging performance in all bands and at different focal lengths. At a characteristic frequency of 17lp/mm ， the modulation transfer function approaches the diffraction limit，and temperature changes have litle effect on imaging quality，meeting design specifications for optical image quality.The optical system is characterized by wide spectral response，large magnification ratio （25×） and fast field of view switching. The spectral resolution reaches 25nm ，and its imaging quality and spectral resolution meet the technical requirements of aviation photoelectric reconnaissance，which has important application value in military reconnaissance， security monitoring and environmental monitoring.
Key words： optical system design; Offner; infrared dual-band; cooled; zoom system
1引言
光谱成像技术不仅具有图像分辨能力，并且具有分辨光谱的能力，利用该技术不仅可以对物体进行定位分析，还可以对其进行定性和定量分析[1-4]。（剩余19898字）
