High frame frequency dynamic infrared scene projector based on dual-DMD

Dynamic infrared scene projection system can provide infrared detectors such as infrared seeker with target infrared radiation characteristics equivalent to the real environment in the laboratory. It can produce dynamic infrared scene to simulate the infrared radiation characteristics of real objects and their environment. The system constitutes a hardware in the loop simulation test system together with multi axis motion platform, seeker system, control system and other related equipment. This paper presents a scheme of infrared scene projection system based on dual digital micro mirror device (DMD), describes the main functions and composition of the system, and focuses on the working mechanism of dual DMD to improve gray level and frame rate. The system consists of dual DMD infrared scene projector, synchronization control device and scene generation computer. Two DMDs are used to modulate the infrared radiation intensity of each frame image and the spatial distribution characteristics of the image, and jointly complete the modulation of the gray level and spatial distribution of the output image. At the same time, the synchronization control device works synchronously with the test equipment or seeker to ensure that the generated infrared field frame rate is synchronized with the image collected by the test system. At present, the high frame rate infrared scene projection system based on dual DMD can meet the index requirements of maximum frame rate of 100Hz and minimum integration time of 2ms, which can vary with the synchronization signal frequency, and meet the integration time and synchronization test requirements of a variety of infrared detection equipment.