초록 ▼

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 adju

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.

대표청구항 ▼

An occupancy sensor-based load controller, comprising: sensing means for transmitting acoustic energy into a space, and for receiving acoustic energy reflected from said space to produce a detector signal indicative of said space; an analog-to-digital converter, connected to said sensing means, for

An occupancy sensor-based load controller, comprising: sensing means for transmitting acoustic energy into a space, and for receiving acoustic energy reflected from said space to produce a detector signal indicative of said space; an analog-to-digital converter, connected to said sensing means, for digitizing said detector signal to produce a digitized detector signal having digital values indicative of said detector signal at controllable sampling intervals; a programmed microprocessor, connected to said analog-to-digital converter, to receive said digitized detector signal, and operable to analyze said digitized detector signal to assess a Doppler shift between said transmitted acoustic energy and said received acoustic energy and to provide an indication of motion within said space as a function of said Doppler shift; and a controllable load energizing device, responsive to said indication of motion, operable to automatically energize and de-energize an electrical load as a function of said indication of motion.