Inductance divider sensor

Details Inductance divider sensor Inductance divider sensor

H - Electricity

03

K

340/124.3

H03K 17/95 (2006.01)

Patent

CA 1278065

INDUCTANCE DIVIDER SENSOR Abstract A method and apparatus for sensing the proximity of a target object includes a sensor inductor (LS, 38) connected in series with an identicalreference inductor (LR, 36) between an input and ground to form an inductive divider network. The sensor inductor is positioned so that its inductance can bevaried in response to the proximity of a target object (14, 40) while the inductance of the reference inductor remains constant. Voltage pulses are periodically applied to the divider network from a source (32, 34) and divide across the reference and sensor inductors in accordance with the ratio of the inductances, as varied or not by the presence of the target object. A detector (30) monitors the output of the divider network and provides a target status signal indicative of the proximity of the target object. For low-power operation, the detector circuit and conductive divider network are periodically and momentarily energized in synchronism. This enables configuration of a self- contained, leadless proximity sensor having a battery power source and an optical output.

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