基于DMD的静态场景仿真成像特性分析

Analysis of frame rate matching of infrared scene simulation system based on DMD

由于数字微镜器件特殊的成像特点,使得场景仿真系统在工作过程中需要解决帧频匹配问题,否则会出现图像混淆现象。分析了DMD芯片实现脉宽调制的特点以及帧频匹配对仿真场景成像系统的影响。通过在仿真系统不同显示时间和探测器不同积分时间情况下进行实验,得出了仿真系统进行静态场景仿真时帧频匹配需要满足的条件,即当满足探测器积分时间达到仿真系统显示时间的整数倍时,就可以避免图像混淆现象发生,而不需要外接同步触发信号。这种方法可以降低工程实现难度,对红外场景仿真系统的推广应用具有重要意义。

Due to the special imaging features of digital micro-mirror device, the scene simulation system need to be addressed in the course of their work flame matching problem to avoid an image aliasing. The modulation characteristics of DMD chip pulse width and the effects that frame rate matches the simulation scene imaging system were analyzed. Through carrying out the system experiments in different display time and detector integration time, the frame matching condition of static scene simulation was obtained, which was that the phenomenon of image aliasing could be avoided when the detector integration time was integral multiple of the display time of simulation system without external synchronization trigger signal. This method can reduce the difficulty in engineering implementation, and it is also important to popularize the application of infrared scene simulation system.