Inductive proximity sensor and position transducer with a passiv

Details Inductive proximity sensor and position transducer with a passiv Inductive proximity sensor and position transducer with a passiv

1991-04-29

1993-08-03

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Displacement

32420732, G01B 714

Patent

active

052332942

ABSTRACT:
A proximity sensor using the magnetic field of a single length of sensor wire. The sensor has a supply circuit for generating a magnetic field around the single sensor wire. The sensor also has a detection circuit for detecting when electrically conductive material intercepts the magnetic lines of flux of the magnetic field surrounding the single sensor wire. In a preferred embodiment the sensor wire is substantially straight and/or the detection circuit detects metal within a distance from the sensor wire approximately two or three times the main dimension of the cross section of the sensor wire. A plurality of sensor wires can be used and a passive actuator or scale can be used to intercept and alter the magnetic field surrounding the sensor wire. The scale can be formed of electrical short circuits aligned at constant steps. The sensor then detects the presence or absence or a short circuit in the magnetic field.

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