Pulsed wireless directional object counter

Details Pulsed wireless directional object counter Pulsed wireless directional object counter

2006-01-13

2008-11-11

Lee, Michael G. (Department: 2876)

Registers

Coded record sensors

Particular sensor structure

C235S385000, C235S454000, C235S382000, C235S384000

Reexamination Certificate

active

07448548

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.

REFERENCES:
patent: 4874063 (1989-10-01), Taylor
patent: 5519784 (1996-05-01), Vermeulen et al.
patent: 6712269 (2004-03-01), Watkins
patent: 2003/0179127 (2003-09-01), Wienand

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