针对反射式双模位标指示器视场小、中心遮拦、能量低等问题, 提出一种折/衍共口径红外双波段位标指示器光学系统。基于消色差理论和MRTD模型分别推导了光学系统波段间消色差公式和作用距离方程。设计的双波段光学系统具有共焦距特性, 从而实现了双波段同步探测以及识别目标信息的一致性。折/衍共口径红外双波段位标指示器光学系统工作波长为3.4~4.8 μm、7.7~9.5 μm, 俯仰、偏航视场为-26°～26°, 焦距115 mm, F数为2。结果表明: 在-40~60 ℃温度范围内消热差, 成像质量接近衍射极限。

Aiming at the problem of small-field, central obscuration and low anergy of reflective optical system, the dual-mode beam positioner optical system of a folded/diffractive co-aperture infrared dual-band positioner was proposed. Based on achromatic theory and MRTD model, the equations of wavelength band achromaticity and action distance were deduced, respectively. With the property of a common focal length in the dual-band optical system, dual-band simultaneous detection and consistency of target information identification were achieved. The parameters of the folded/diffractive co-aperture infrared dual-band positioner optical system were as follows: wavelengths are 3.4-4.8 μm and 7.7-9.5 μm, pitch/yaw is -26°-26°. focal length is 115 mm and F number is 2. The results show that thermal difference eliminated in the temperature range of -40-60 ℃, the optical transfer function is close to the diffraction limit.