Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1995-02-06
1997-06-17
Mullen, Thomas
Communications: electrical
Condition responsive indicating system
Specific condition
250DIG1, 340516, 340567, 315307, 367 94, G08B 1300
Patent
active
056401434
ABSTRACT:
An occupancy sensor that provides improved performance by the inclusion of a microprocessor that controls the sensing transducers and processes the received signal to optimize desired detection performance. The occupancy sensor includes a quadrature detection technique and automatic sensitivity adjustment that reduce false detection caused by air flow, hallway traffic and other noise sources. A fault detection method executed periodically detects fault conditions in the sensor or sensing area caused by component failure or obstructions in front of the sensor. Transmitter power is varied depending on the size of the desired coverage area. Since various ambient parameters such as line voltage, light level, and temperature may be easily and usefully monitored, the microprocessor may use these variables to make intelligent decisions in controlling electrical loads, such as building lighting and ventilation.
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Hardin Charles C.
Myron Douglas D.
Stephens Michael A.
Williams Errol R.
Woytek Timothy W.
Mullen Thomas
Mytech Corporation
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