Hysteresis compensation in a magnetostrictive linear position sensor

Fernando Seco*, José Miguel Martín, Jose L Pons, Antonio Ramón Jiménez

*Corresponding author for this work

Research output: Contribution to journalConference article

28 Scopus citations

Abstract

A new linear position sensor (Micrus) has been developed, based on the transmission of ultrasonic signals in a waveguide. Waves are generated at the cursor position by the magnetostrictive effect, and their times of flight to the ends of the waveguide are used to estimate the position of the mobile element. The choice of the generating/transmitting metal for this kind of sensor is discussed. We have found that the magnetic hysteresis inherent to the magnetostrictive phenomenon translates into measurement hysteresis, affecting the performance of the sensor. An explanation of the link between both effects is given, and a compensation technique based in focusing the ultrasonic generation is offered. This compensation technique is tested using an electromagnetic finite element method program and then empirically in the Micrus sensor, with satisfactory results.

Original languageEnglish (US)
Pages (from-to)247-253
Number of pages7
JournalSensors and Actuators, A: Physical
Volume110
Issue number1-3
DOIs
StatePublished - Feb 1 2004
EventSelected Papers from Eurosensors XVI Prague, Czech Republic - Prague, Czech Republic
Duration: Sep 15 2002Sep 18 2002

Keywords

  • Electromagnetic generation of ultrasound
  • Linear position sensor
  • Magnetic hysteresis
  • Measurement hysteresis

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electrical and Electronic Engineering

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