Humidity Sensitivity and Coil Design of a High-Precision Eddy-Current Displacement Sensor

Johan G. Vogel, Vikram Chaturvedi, Stoyan Nihtianov

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

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Abstract

Unlike capacitive displacement sensors, Eddy-Current Displacement Sensors (ECDSs) possess an inherently low sensitivity to environmental conditions, such as the humidity of the ambient air. By elevating the excitation frequency it is possible to mitigate their major limitations regarding stability and resolution, making them of interest for high-precision displacement sensing. However, by increasing the excitation frequency, ECDSs become less immune to environmental conditions, due to the inevitable parasitic capacitance of the sensing coil. In this work, we formulate a requirement for the minimum Self-Resonance Frequency (SRF) of the coil, based on the specified humidity variation and the allowable displacement error. This requirement provides an input for the design of the high-precision ECDS probe.
Original languageEnglish
Title of host publicationProceedings of Eurosensors 2017
Pages1-5
Number of pages5
DOIs
Publication statusPublished - 2017
EventEurosensors 2017: 31st Conference - Paris, France
Duration: 3 Sep 20176 Sep 2017
Conference number: 31
http://www.eurosensors2017.eu/

Publication series

NameProceedings
PublisherMDPI
Number4
Volume1
ISSN (Print)2504-3900

Conference

ConferenceEurosensors 2017
CountryFrance
CityParis
Period3/09/176/09/17
Internet address

Keywords

  • displacement sensor
  • eddy-current sensor
  • parasitic capacitance
  • self-resonance frequency
  • humidity sensitivity
  • planar coil

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