FILM_BREAK_DETECTOR

Published:2009/7/13 1:37:00 Author:May | From:SeekIC

Photographic film in processor is run through resonant acoustic chamber in which presence of film affects en energy transfer between crystal transducers.Change in transducer output when film breaks is used to operate relay through amplifier and detector, to control automatic film processor and thereby minimize rethreading and film spoilage. Can also be used to detect bubbles in rubber tubing during blood transfusions, and detect similar changes in other films, liquids, and gases.-E. L. WIthey and R. G. Seed, Acoustic Cavity Detects Breaks in Film, Electronics,31:13,p50-51.



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