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本文描述以光电脉冲的原理,构成测量快门开启时间的装置。装置由一个光源、一个光栏、两个聚光镜和一个光电倍增管组成,所有元器件均安装在一个屏蔽的暗箱中。当快门开启时,通过光栏的光通量随快门开启孔径的增大而增大,同时光电倍增管产生的光电流也随着增大。快门全开启时,光通量达最大,光电倍增管产生的光电流脉冲也达最大此。光电流脉冲在检测电阻上形成电压脉冲,用快速脉冲示波器测量此电压脉冲幅度的上升时间,即为被检测快门开启时间的度量。
This article describes the principle of photo-electric pulses to form a device for measuring the shutter-on time. The device consists of a light source, a light bar, two condenser lenses and a photomultiplier tube, all of which are mounted in a shielded dark box. When the shutter is open, the light flux through the light bar increases with the opening of the shutter, and the photocurrent generated by the photomultiplier tube also increases. When the shutter is fully open, the luminous flux reaches the maximum, and the photocurrent pulse generated by the photomultiplier tube reaches the maximum. The photocurrent pulse forms a voltage pulse on the detection resistor, and the fast pulse oscilloscope measures the rising time of the voltage pulse amplitude, which is the measure of the shutter open time to be detected.