Article | REF: R1331 V1

Non-contact measurement - Magnetic and capacitive methods

Author: Jean-Louis CHARRON

Publication date: December 10, 2003

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1. Magnetic sensors

Sensors using magnetic methods are capable of measuring the position or displacement of parts that are :

  • or magnetized;

  • or ferromagnetic;

  • or just conductors.

The measurement of a distance or its variations is carried out by :

  • measurement of magnetic induction or its variations ;

  • or impedance measurement ;

  • or the coupling of windings mounted on a magnetic circuit.

  • Magnetic induction can be measured using Hall-effect sensors, magnetoresistors or saturable magnetic circuits. To measure variations in magnetic induction, a coil mounted on a magnetic circuit can be used....

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