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.