Photoelectric light barrier for large areas - with pairs of IR emitter-detectors switched in sequence
作者： Hans Ing Grad Brandt , Horst Dipl Ing Stoetzner , Felix Dipl Ing Lentze
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摘要: The photo-electric light barrier for large areas consists of a number emitters and corresp. detectors positioned at either side the area being monitored. Each transmitter comprises an L.E.
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