Shieldless Eddy-Current Displacement Sensor with Improved Measurement Sensitivity

Conference paper (2018)

Authors

Vogel Electronic Instrumentation - EEMCS
Chaturvedi Electronic Instrumentation - EEMCS
Nihtianov Electronic Instrumentation - EEMCS
Research Group
Electronic Instrumentation (EEMCS) (TU Delft)
Eddy-current sensor Sensor design Displacement sensing Magnetic shielding Ratiometric measurement
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Published Date

2018

Language

English

Reuse Rights

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Faculty

Electrical Engineering, Mathematics and Computer Science

Department

Microelectronics

Research Group

Electronic Instrumentation

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.

Files

08549631.pdf
(.pdf | 0.91 Mb)