触发方式对低速相机采集图像时间准确度的影响

In order to enable low-speed cameras to acquire high time precision image sequences, the study mainly investigated the acquisition time accuracy and the error of image sequences of low-speed cameras triggered by three typical modes (hardware trigger mode, software trigger mode and continuous acquisition trigger mode).The acquisition time was obtained by a method based on a light-time coding technique. First, the time message was encoded into each photo by the light-time coding technique, and the exact acquisition time of the photos was obtained. Second, the travel time error was calculated by comparing the time interval between every two images with the standard value. Experimental results indicate that the travel time errors of the hardware trigger and continuous acquisition trigger modesare ±0.1 ms, while the error of the software trigger mode is 32.2 ms. For experiments with high time precision requirement, the hardware trigger and continuous acquisition trigger modes are suggested.