PAPER_FLAW_DETECTOR

Published:2009/7/20 10:49:00 Author:Jessie | From:SeekIC

Locates defects in paper despite photomultiplier noise amplitudes comparable to flaw-signal amplitudes. Two identical phototubes are used, each with identical preamplifiers, amplifiers, and pulse height discriminators. One phototube looks at paper ahead of other. Output of leading phototube is delayed to give same effect as if both looked at same area at same time. Pulses due to real defects then occur at same time and pass coincidence circuit. Pulses due to noise are random in time and do not pass.-M. P. MacMartin, Sensitive Flaw Detector Solves Noise Problems, Electronics, 33:16, p 64-66.



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