DMD-Based Anti-Strong-Light Detecting and Imaging System

Strong light interference severely degrades imaging system performance. This paper presents a novel digital micromirror device (DMD)-based imaging system for robust, strong light suppression and long-distance detection. Our design strategically places the DMD at the primary image plane, utilizing a large F-number objective for extended depth of field. The relay imaging system employs a tilted image plane in a near-symmetric configuration to effectively balance DMD-induced aberrations, which avoids the off-axis layout and overall tilt of the relay system itself and greatly simplifies system alignment. Stray light analysis verifies the rationality of the structural design, and MTF tests confirm that the assembly performance of the prototype meets the design requirements. The system can achieve clear imaging of buildings at 1 km, which demonstrates its long-distance imaging capability. With an entrance pupil power density of 4.68 × 10−4 W/cm2, strong light interference suppression has been successfully achieved via the DMD regional flipping method. This system offers an efficient solution for long-range imaging in strong light environments.