基于DMD的时变目标模拟研究

Time-varying Source Simulation Research Based on Digital Micromirror Device

在太阳望远镜的相关跟踪稳像系统的实验室研制阶段,需要能反映真实时变特性的面源目标。动态目标模拟装置应兼具高刷新率和高成像质量的特点。目前,国内外使用的目标模拟器的帧频普遍较低,有的在高速显示时会出现亮度闪烁现象,不适于本系统的应用。使用数字微镜阵列(Digital Micromirror Device,DMD)作为相关跟踪稳像系统的显示器件进行实验,以图像序列的相关系数值为衡量动态目标演化特性的指标,研究了不同目标图像、灰度级、帧频等因素对模拟效果的影响。实验结果表明,对目标时变特性的模拟效果与观测站进行太阳观测的实际情况吻合,使用数字微镜器件提供动态模拟目标能够满足稳像系统的开发需求。

An extended source with time-varying characteristics is required in the laboratory development of correlation tracker image stabilization system in the solar telescope.Dynamic source simulator should have high refresh rate and high imaging quality.At present,the frame rates of the source simulators used in China and abroad are generally low,and some will bring flicker in the high-speed display.So they are not suitable for the application of our system.We use the digital micromirror device(DMD)as the display device of correlation tracker image stabilization system for experiments and study the effect of different source images,grayscale levels,frame rates on the simulation by measuring the correlation coefficient value of the image sequences as an indicator of the time-varying characteristics of dynamic sources.The experimental results show that the simulation results of time-varying characteristics of the source consistent with the actual situation of the observatory in solar observation.The dynamic simulation source provided by DMD can fulfill the development requirements of image stabilization system.