Measuring and testing – Brake testing – Single wheel rotating and resistance measuring means
Patent
1976-03-31
1978-10-31
Gill, James J.
Measuring and testing
Brake testing
Single wheel rotating and resistance measuring means
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: 3048775 (1962-08-01), Calvert
patent: 3132520 (1964-05-01), Wing
patent: 3146394 (1964-08-01), Frisch
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patent: 3261210 (1966-07-01), Buchold
patent: 3487402 (1969-12-01), Hillhouse
patent: 3515987 (1970-06-01), Zurbrick et al.
patent: 3732553 (1973-05-01), Hardway
patent: 3882381 (1975-05-01), Gregory
Gill James J.
Greigg Edwin E.
Simmonds Precision Products Inc.
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