作者: Stephen C. Thayer
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摘要: Disclosed is an apparatus for determining the number of moving objects which completely traverse a given path. The provides array light sensors are placed adjacent A scanner periodically samples output each sensor in and produces proportional to ambient path striking sensor. This stored comparison with future outputs so that changes may be detected. Changes at particular compared detected by sensors, first prevent erroneous readouts second determine direction movement. Moving traversing field recorded.