The optical design of a seeker, operating in two bands of infrared (MWIR-LWIR), is performed. The dual-band design has been developed on Zemax OpticStudio. Considering the optical parameters of commercially available dual-band IR detectors, the design of the IR imaging seeker is completed for the operation within the wavelength range of 3–10 µm. The temperature dependence of the optical design is also examined for four different lens barrel materials, for the large temperature interval ranging from −40°C to 80°C. The defocusing effect caused by using different lens barrel is fixed by the passive-optical-athermalization technique. The field of view of the optical system is found to be 16°. The modulation transfer function (MTF) value of each field is higher than 0.50 when the spatial frequency takes a value of 20.8 lp/mm. The results are analyzed and discussed in terms of spot diagram, MTF.

执行在两个红外波段 (MWIR-LWIR) 中工作的导引头的光学设计。双波段设计是在 Zemax OpticStudio 上开发的。考虑到市售双波段红外探测器的光学参数，完成了红外成像导引头的设计，可在3-10 µm波长范围内工作。还针对四种不同的镜筒材料，在 -40°C 至 80°C 的大温度范围内检查了光学设计的温度依赖性。使用不同镜筒造成的散焦效果通过被动光学消热技术来解决。发现光学系统的视场为16°。当空间频率取值为 20.8 lp/mm 时，每个场的调制传递函数 (MTF) 值高于 0.50。