基于高速摄像机触发模式的特点，提出了一种基于电信号监测的可控自触发电弧图像采集系统. 介绍了系统硬件平台组成和软件总体框架，论述了以电信号有效值为监测条件的相关控制触发算法，叙述了电信号和电弧图像同步采集的具体实现方法，并以表面涂有油污的试样进行了电弧图像采集系统的试验验证. 结果表明，该系统能够有效基于电信号可靠自动触发高速摄像机拍摄，抓捕涂有油污表面的过渡过程信息. 相比于正常焊接过程，试样表面存在油污时，过渡周期明显增加，电弧形态呈现出较大的发散性.
According to the characteristics of the high-speed camera trigger mode, a new method of controllable self-triggered arc image acquisition was proposed based on electrical signal monitoring. The system's hardware platform composition and software framework were introduced. The shooting trigger algorithm based on the root mean square value of electric signal as the monitoring condition was discussed, and the specific implementation method of synchronous collection of the electric signal and the arc image were described. The arc image acquisition system was verified by the welding experiment of the specimen with a greasy surface. The experiment showed that the system could effectively and reliably trigger high-speed camera shooting based on electrical signals and capture the transition process information of the greasy surface. Finally, compared with the normal process, the transition period was obviously increased when it was the greasy surface, and the arc was more diffused.
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