Research on a Compact Infrared Dual-Band Seeker Optical System

文章聚焦于中、长波红外导引头光学系统研究。通过设计增强全天候工作以及红外双波段协同工作等关键能力，并实现光学系统的紧凑化设计。采用碲镉汞双色红外探测器，有效解决了传统导引头光学系统因多光路、多探测器配置而导致的尺寸过大与质量过重的难题。建立中、长波红外协同工作模式，提升导引头光学系统的目标识别能力。系统总长度控制在67 mm左右，布局紧凑以实现小型化设计目标，能够更好地适应各类装备平台的安装需求。设计结果表明，该系统增强了全天候工作能力。中波红外的调制传递函数(MTF)在截止频率处可达0.5，长波红外的MTF在截止频率处大于0.25，中、长波系统的点列图均接近衍射极限，并且在−45℃~60℃温度范围均能够实现较好的成像质量。该设计为复杂环境下的精确制导提供了有力支撑。This study focuses on the development of a mid-wave infrared (MWIR) and long-wave infrared (LWIR) seeker optical system. The design enhances critical capabilities, including all-weather operation and dual-band infrared collaboration, while achieving a compact optical system architecture. By employing a mercury cadmium telluride (MCT) dual-color infrared detector, the system effectively addresses the challenges of excessive size and heavy weight associated with multi-optical-path and multi-detector configurations in the traditional seeker optical system. A collaborative working mode between MWIR and LWIR is established to improve target recognition capabilities of seeker optical system. The total system length is optimized to approximately 67 mm, with a compact layout to meet miniaturization objectives, ensuring compatibility with various equipment platforms. Experimental results demonstrate that the system significantly enhances all-weather operational performance. The modulation transfer function (MTF) of the MWIR system reaches 0.5 at the cutoff frequency, while the MTF of the LWIR system exceeds 0.25 at the cutoff frequency. Spot diagrams for both MWIR and LWIR systems approach the diffraction limit, and the system maintains high imaging quality across a temperature range of −45˚C to 60˚C. This design provides robust support for precision guidance in complex environments.