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DirectionalObjectCounter

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http://www.freepatentsonline.com/7448548.html .

 Pulsed wireless directional object counter

Document Type and Number: United States Patent 7448548

Abstract: A directional object counter uses two or more light sources to generate pulses of light, which travel on two light paths across a passageway. Light from both sources illuminates two sensors, after the light has traversed the passageway, and a processor connected to the sensors determines, based on the pulsed nature of the sources, which source(s) is/are illuminating which sensor(s), and counts movement of objects through the light paths in an identified direction. The pulsed nature of the light permits low-power operation of the directional object counter with a battery. Furthermore, the independence of the pulse discrimination from the pulse generation, enables the light sources and light sensors to be positioned on opposite sides of a passageway without wiring connecting them across the passageway.

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http://www.freepatentsonline.com/y2003/0179127.html

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