具有开窗口功能的高帧频面阵CCD时序驱动研究

Design of the Time Sequence Drive for High Frame Rate Area Array CCD with Region-of-Interest Capability

随着机器视觉技术的不断发展和光电检测领域实际需要的变化,在许多检测环境下需要帧频非常高的面阵CCD相机系统。而市面上常见的科学级相机帧频大都在几十赫兹,这对于闭环检测带宽要求非常高的系统来说远远不够。能否大幅提高检测环节的带宽,成为闭环检测系统能否实现的关键。针对这样的情况,研制了具有"开窗口"功能的面阵CCD相机,该技术通过减少输出像元个数,只输出包含有检测信息的有效像元信号,从而缩短水平位移输出时间,最终提高了相机的帧频。本文阐述了使用面阵CCD TC237来实现开窗口功能的时序驱动方法及其对帧频影响的研究。根据窗口开设的大小和位置的不同,帧频可以提高到几百至几千赫兹。

With the developing of machine vision and the requiring of opto-electronic measuring, higher frame rate area array CCD camera is required under many testing conditions. It is not far enough that the frame rate of the common science camera has tens of hertz mostly for the system which requires very high bandwidth of closed loop detection. Whether or not to rise the bandwidth of detecting link by a big margin becomes the key of the closed loop system. So the array CCD camera with region-of-interest （ROI） was made, which only transmits available pixel signals containing the detected information, to reduce output pixel number, shorten the horizontal displacement output time and improve the frame rate of the camera. The method of the time sequence drive with ROI realized by TC237 type of area array CCD and its influence on the frame rate were studied. The studied results show that the frame rate can be improved from hundreds of hertz to thousands of one according to different sizes and positions of ROI.