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Proceeding Paper

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

Electronic Instrumentation Laboratory, Delft University of Technology, Mekelweg 4, 2628CD Delft, The Netherlands
*
Author to whom correspondence should be addressed.
Presented at the Eurosensors 2017 Conference, Paris, France, 3–6 September 2017.
Proceedings 2017, 1(4), 283; https://doi.org/10.3390/proceedings1040283
Published: 28 August 2017
(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)
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.
Keywords: displacement sensor; eddy-current sensor; parasitic capacitance; self-resonance frequency; humidity sensitivity; planar coil displacement sensor; eddy-current sensor; parasitic capacitance; self-resonance frequency; humidity sensitivity; planar coil
MDPI and ACS Style

Vogel, J.G.; Chaturvedi, V.; Nihtianov, S. Humidity Sensitivity and Coil Design of a High-Precision Eddy-Current Displacement Sensor. Proceedings 2017, 1, 283. https://doi.org/10.3390/proceedings1040283

AMA Style

Vogel JG, Chaturvedi V, Nihtianov S. Humidity Sensitivity and Coil Design of a High-Precision Eddy-Current Displacement Sensor. Proceedings. 2017; 1(4):283. https://doi.org/10.3390/proceedings1040283

Chicago/Turabian Style

Vogel, Johan G., Vikram Chaturvedi, and Stoyan Nihtianov. 2017. "Humidity Sensitivity and Coil Design of a High-Precision Eddy-Current Displacement Sensor" Proceedings 1, no. 4: 283. https://doi.org/10.3390/proceedings1040283

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