Shieldless Eddy-Current Displacement Sensor with Improved Measurement Sensitivity

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Shieldless Eddy-Current Displacement Sensor with Improved Measurement Sensitivity

Conference Paper (2018)

Author(s)

Johan G. Vogel (TU Delft - Electronic Instrumentation)

Vikram Chaturvedi (TU Delft - Electronic Instrumentation)

Stoyan Nihtianov (TU Delft - Electronic Instrumentation)

Eddy-current sensor Sensor design Displacement sensing Magnetic shielding Ratiometric measurement

DOI related publication

https://doi.org/10.1109/ET.2018.8549631 Final published version

To reference this document use

https://resolver.tudelft.nl/uuid:988ade04-c454-471d-8b46-ef29a7bdcb5a

More Info

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Publication Year

2018

Language

English

Article number

8549631

ISBN (electronic)

978-153866692-0

Event

27th IEEE International Scientific Conference Electronics, ET 2018 (2018-09-13 - 2018-09-15), Sozopol, Bulgaria

Downloads counter

139

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.