Arrangement for sensing proximity of a reciprocating member

Details Arrangement for sensing proximity of a reciprocating member Arrangement for sensing proximity of a reciprocating member

1980-01-14

1983-05-24

Groody, James J.

Communications: electrical

Continuously variable indicating

With particular transmitter

324208, 324220, 73119A, 34087018, G08C 1906, G08C 1912, G01B 714

Patent

active

043852971

ABSTRACT:
An eddy current coupled transducer and external electrical circuit are disclosed for use with a fluid actuator for detecting the relative position of the reciprocating member of the actuator. The transducer includes a fitting providing a fluid pressure seal whereby the transducer can be fitted to the actuator and communicate with its interior. The transducer detects the absolute position of the reciprocating member of the actuator by eddy current coupling. A change in the amplitude of the high frequency signal supplied to the transducer by the external electrical circuit occurs when the reciprocating member is in close proximity to the transducer. This change in amplitude is detected by the electrical circuit to provide an on-off switching signal for associated equipment in response to the position of the actuator reciprocating member.

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patent: 4213110 (1980-07-01), Holce

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