Electromagnetic Navigation Linear Displacement Transducer Based on Magnetic Field Gradient Technique

Mingji Zhang, Siu Wing Or, Sansheng Wang, Fu Kuo Chang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

3 Citations (Scopus)


A linear displacement transducer (LDT) for electromagnetic navigation is developed based on the sensing of magnetic field gradients in a pair of counterwound coils. The operation and linear response conditions of the LDT are theoretically described by electromagnetic formulations, numerically analyzed by COMSOL Multiphysics finite-element analysis, and experimentally verified in a 1/10-scaled inspection vehicle-overhead cable model. A high sensitivity of 51 V/cm and a small nonlinearity of 3.7% are achieved in the LDT prototype by setting an optimal height-to-baseline h/L ratio of 1/ 8 in a practical linear response condition with the transverse displacement d constraint of }50% of L. The proposed LDT can overcome the discontinuous response and nonlinearity problems intrinsic in traditional magnetic field-based LDTs, thereby providing a continuous displacement (movement) feedback with an accuracy of within several millimeters.
Original languageEnglish
Article number7116575
JournalIEEE Transactions on Magnetics
Issue number11
Publication statusPublished - 1 Nov 2015


  • counter-wound coils
  • electromagnetic navigation
  • linear displacement transducer
  • magnetic field gradients

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering


Dive into the research topics of 'Electromagnetic Navigation Linear Displacement Transducer Based on Magnetic Field Gradient Technique'. Together they form a unique fingerprint.

Cite this