Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1998-01-07
1999-11-16
Lee, Benjamin C.
Communications: electrical
Condition responsive indicating system
Specific condition
340541, 340680, 3406866, 32420718, 32420716, 324234, 324232, 324236, 324662, 324327, G08B 1326
Patent
active
059865490
ABSTRACT:
An object sensing system (10) employs a resonant sensor (20) that receives drive energy coupled from an oscillator (12) operating at a frequency equal or close to the resonant frequency of the resonant sensor. The resonant sensor preferably includes an planar winding (60) that maximizes its distributed inductive and capacitive components, which are sensitive to a proximal conductive, nonconductive, magnetic, or nonmagnetic object (22). The resonant sensor is electrically connected in one leg of a voltage divider that produces a changing output signal voltage in response to resonant frequency changes caused by the object in proximity to the resonant sensor. The signal voltage is amplified, filtered, and processed to extract relevant data indicative of the presence, distance, movement, or proximity of the object.
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