A digital pulse integrator is described for measuring the voltage-time area of electrical impulses such as the photocurrent resulting from the photoelectric observation of a xenon flash source. As the basis of its operation, the positive pulse to be integrated charges a capacitor. A decade scaler then counts the number of smaller negative pulses from a crystal oscillator that are required to discharge the capacitor to its original voltage.
A specific circuit has been tested both with square pulses having an adjustable amplitude and duration and with linearly attenuated impulses of irregular shape. Repeated measurements of similar pulses are reproducible within ±1 count. For pulses having amplitudes in the range 50 to 170 v and areas in the range 1.5 to 24 msec-v the observed count is linearly proportional to the pulse area within ±2 counts.
© 1960 Optical Society of AmericaFull Article | PDF Article
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