Shieldless Eddy-Current Displacement Sensor with Improved Measurement Sensitivity

Johan G. Vogel, Vikram Chaturvedi, Stoyan Nihtianov

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review

Abstract

The major limitations of eddy-current displacement sensors, such as low measurement sensitivity and low stability, can be mitigated by using low-inductance flat coils in combination with a ratiometric measurement and a high excitation frequency, thus making eddy-current sensors of interest for high-precision applications. For the ratiometric measurement, the sensing coil is used in combination with a constant inductance reference coil, which are magnetically isolated from each other by a shield. In this paper, the implications of omitting the shield are studied. It is shown that a shieldless design brings several advantages related to sensitivity, compactness and manufacturability.

Original languageEnglish
Title of host publication2018 IEEE 27th International Scientific Conference Electronics, ET 2018 - Proceedings
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
Number of pages4
ISBN (Electronic)978-153866692-0
DOIs
Publication statusPublished - 2018
Event27th IEEE International Scientific Conference Electronics, ET 2018 - Sozopol, Bulgaria
Duration: 13 Sep 201815 Sep 2018

Conference

Conference27th IEEE International Scientific Conference Electronics, ET 2018
CountryBulgaria
CitySozopol
Period13/09/1815/09/18

Keywords

  • displacement sensing
  • eddy-current sensor
  • magnetic shielding
  • ratiometric measurement
  • sensor design

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