Optical meter reader using a shadow
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United States of America Patent
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-
Mar 9, 1999
Grant Date -
N/A
app pub date -
Jun 9, 1997
filing date -
Jun 9, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A meter reader for reading a meter by reading a shadow made by a meter pointer on the face of the meter. The meter reader includes a light source for shining a light toward the meter, a pulse control circuit for pulsing the light source, two light sensors for receiving reflections of the pulsed light from two sections of the face, a detection circuit for detecting the intensity of the reflections received by each of the sensors, a microprocessor system for calculating an intensity relationship between the intensities received by each of the sensors, a counter for incrementing a meter readout count when the intensity relationship varies indicating that the shadow has passed over both sections of the meter face, and a transmitter for transmitting the meter readout count in a meter readout signal.
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