A remote position sensing method based on passive high magnetic permeability thin films

Heng Wang, Rajesh Rajamani

Research output: Contribution to journalArticle

Abstract

This article develops a fundamental new sensing principle for measuring the position of a moving object. The moving object is equipped with a thin film of high magnetic permeability. A stationary electromagnet and a magnetic sensor are located nearby. As the moving object's position changes, the coupling between the electromagnet and the magnetic sensor changes, allowing highly accurate measurement of position of the moving object. This new sensing principle will allow remote non-contacting position measurement of moving objects without requiring any electronics or battery on the object. The feasibility of the new measurement system is verified using an experimental piston-cylinder system in which the position of the piston is accurately estimated with an accuracy of approximately 1% of the range of motion. The thin film is inexpensive and lightweight and could enable a new generation of position sensors superior to currently available position measurement technologies.

Original languageEnglish (US)
Pages (from-to)217-223
Number of pages7
JournalSensors and Actuators, A: Physical
Volume295
DOIs
StatePublished - Aug 15 2019

Fingerprint

position sensing
Magnetic permeability
Magnetic sensors
Position measurement
Electromagnets
Pistons
magnetic permeability
Thin films
thin films
Electronic equipment
electromagnets
pistons
Sensors
sensors
electric batteries
electronics

Keywords

  • Magnetic sensors
  • Mechanical actuators
  • Mechanical motion measurement
  • Position sensors

Cite this

A remote position sensing method based on passive high magnetic permeability thin films. / Wang, Heng; Rajamani, Rajesh.

In: Sensors and Actuators, A: Physical, Vol. 295, 15.08.2019, p. 217-223.

Research output: Contribution to journalArticle

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