Energy conservation, lighting, security
Need for energy conservation through lighting control
This invention proposes a proximity sensor that can be integrated with a fluorescent lamp ballast. It measures disturbances in the electric field enabling fine-grain occupancy measurements in spaces without requiring a motion or thermal signature providing a means to improve building energy efficiency through reduction of waste lighting by detection of unoccupied spaces. There are two detection schemes: one uses dimmed sensing to dim the lamp ballasts, the other uses sparse sensing to take advantage of the wide angle of detection of the sensors, requiring fewer lamp sensors. The electronics do not contribute significantly to the noise floor of the lamp sensor. The output sensitivity is affected by electrode spacing, depth and bulb power.
Consistent lighting in occupied spaces with detection of motion and presence for ranges of up to 11 ft.
US Patent Number 7,923,936, issued on April 12, 2011
Last revised: April 29, 2013
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