轻薄型折反式中波红外超焦距成像镜头设计

Design of Compact Mid-Infrared Detection Hyperfocal Imaging Lens Based on an Annular Folded Structure

  • 摘要: 随着光电成像技术在无人机系统和目标识别领域的深入发展,轻薄紧凑的光学系统已成为研究热点。针对无人机系统对小型化高清红外探测系统的迫切需求,本文分析了环形折反式结构的景深理论,并在此基础上设计了一款应用于中红外波段,面向中远距离探测,超焦距对焦的轻薄型折反式镜头。为了实现单片式小型化的结构,镜头采用硒化锌材料和高次非球面设计,有效矫正了像差,极大减小了系统长度和体积,可以在不变焦的情况下实现大范围、快速成像。结果表明,该镜头外口径为50.00 mm,有效焦距为43.08 mm,最大厚度仅为23.70 mm,在195.12 m至无限远的景深范围内具有良好的成像质量,实现了中波红外探测系统的小型化设计。该中波红外折反式镜头具有结构紧凑、抗振动、探测范围广、分辨率高等优点,有效解决了传统红外定焦系统探测范围小、结构复杂的问题,可以满足新一代轻薄红外探测系统的需求。

     

    Abstract: With advances in optoelectronic imaging technology for unmanned aerial systems and target recognition, the development of lightweight and compact optical systems has emerged as a major research focus. To address the pressing demand for miniaturized, high-resolution infrared detection systems, this study proposes a compact annular folded lens designed for the mid-infrared band, optimized for long-range detection under hyperfocal focusing conditions. To achieve a monolithic miniaturized configuration, the lens employs zinc selenide as the optical material and incorporates a high-order aspherical design. This approach effectively corrects aberrations while substantially reducing the overall length and volume of the system, thereby enabling wide-field, rapid imaging without the need for zooming. The results indicate that the proposed lens, featuring an external aperture of 50.00 mm, an effective focal length of 43.08 mm, and a maximum thickness of only 23.70 mm, achieves high imaging quality across a depth-of-field range from 195.12 m to infinity, thereby realizing miniaturization of a mid-infrared detection system. The mid-infrared refractive lens offers several advantages, including a compact structure, strong vibration resistance, a wide detection range, and high resolution. These characteristics effectively overcome the limitations of conventional infrared fixed focus systems, which typically suffer from restricted detection ranges and bulky structural designs. Consequently, the proposed lens design is well-suited to meet the performance requirements of next-generation compact infrared detection systems.

     

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