Capacitive proximity sensors

Measuring and testing – Brake testing – Single wheel rotating and resistance measuring means

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73660, 324 61R, G01L 310

Patent

active

041227085

ABSTRACT:
A capacitive proximity sensor for use in hostile environments comprises a ceramic substrate, and two conductive regions formed on the substrate and having opposed edges defining a narrow gap therebetween. The gap configuration is such as to maximize the fringing of electric flux lines outwards from the substrate when one conductive region is energized from a high frequency source. The other conductive region is connected to remotely located signal conditioner operative to maintain said other region at virtual ground and thereby eliminate signal error due to cabling capacitances. On approach of a flux-shielding body to the sensor, the sensor output current to the signal conditioner will decrease as a function of the proximity of the body. The sensor can be used as a simple proximity sensor or incorporated in a shaft torque measurement system operative down to zero r.p.m.

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patent: 3515987 (1970-06-01), Zurbrick et al.
patent: 3732553 (1973-05-01), Hardway
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