Proximity sensor with remotely coupled output

Details Proximity sensor with remotely coupled output Proximity sensor with remotely coupled output

1985-06-21

1988-04-19

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Magnetic

Displacement

336 45, G01B 714, H01F 2102

Patent

active

047392606

ABSTRACT:
A proximity sensor includes an electrical circuit formed by a slot in an elongate conductive strip. The strip carries a magnet having a pole piece protruding through the strip at one end of the slot. At the other end of the slot pass laminations which magnetically couple the electrical circuit and a multi-turn coil arranged on a form attached to the strip. The coil is terminated at a pair of output leads. A ferrous object passing in the vicinity of the pole piece of the magnet modifies the flux pattern at the pole face. The resultant flux changes, being tightly coupled to the electrical strip, induce a low voltage high current emf into the strip, which forms the primary turn of a current transformer. The secondary of the current transformer is formed by the close-coupled coil, which has multiple turns, dependent upon the output voltage required at the output leads. The invention overcomes the problem of providing a proximity sensor which can operate at a high temperature since the conductive strip may be uninsulated, without consequent danger of insulation breakdown, as with prior art multi-turn arrangements.

REFERENCES:
patent: 2532100 (1950-11-01), Howell
patent: 3876927 (1975-04-01), Gee et al.
patent: 4382230 (1983-05-01), Gauthler
patent: 4444063 (1984-04-01), Snowden et al.

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