多通道数字化快门速度测试仪的设计与实现

摘要

The multichannel digital shutter velocity tester is mainly used in measuring the exposure time of a camera curtain shutter. Photoelectric receivers are placed at different points in the focal plane, by which the optical signals are converted to electric signals. The test system collects the electric signals through high speed collection channels by the preset order with DMA mode. After data processing, exposure time acquired by the method given in this paper is analysed and measured. The test system is not only accurate, but also reliable. The test results can be visualy displayed on the screen.%多通道数字化快门速度测试仪主要应用于幕帘式相机快门有效曝光时间的测试。在像面上的不同点设置多组光电接收器，将像面接收到的光信号转换为电信号。高速数据采集系统利用DMA方式按时序对各接收器的曝光信号进行实时瞬态数据采集。采集数据经计算软件处理，得到各点处的快门有效曝光时间。利用软件解决了瞬态信号与实时采集同步的问题。测试系统简单可靠、测试结果显示直观。