Position sensor

Details Position sensor Position sensor

1982-04-26

1983-09-13

Gill, James J.

Measuring and testing

Dynamometers

Responsive to force

73517R, 324207, G01L 104

Patent

active

044035152

ABSTRACT:
A position sensor for detecting a displacement of an object, comprising a movable member coupled to the object, a permanent magnet connected to the movable member, and a magnetically soft member surrounded by an electrical coil secured adjacent to a range of movement of the magnet. Voltage pulses are applied to one end of the electrical coil, the other end of which is connected in series with the resistor. For each pulse applied to the coil, a voltage drop across the resistor is detected and a time lag between the leading edge of the applied pulse and the corresponding voltage drop across the resistor is measured by a processing circuit which produces an analog voltage or a digital code indicative of the time lag. A displacement of the object produces a change in magnetic field at the magnetically soft member which results in a corresponding variation in the above-noted time lag, which is therefore indicative of the displacement of the object.

REFERENCES:
patent: 3958203 (1976-05-01), Bernin
patent: 4140971 (1979-02-01), Blincoe

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