Demodulation Techniques for Self-Oscillating Eddy-Current Displacement Sensor Interfaces

A Review

Journal article (2017)

Authors

Vikram Chaturvedi Electronic Instrumentation -

Mohammad Reza Nabavi Electronic Instrumentation -

Johan G. Vogel Electronic Instrumentation -

Stoyan Nihtianov Electronic Instrumentation -

Research Group

Electronic Instrumentation () (TU Delft)

Displacement measurement ECDS interface Amplitude demodulation technique

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http://resolver.tudelft.nl/uuid:8f5ed72c-3977-4414-aa6c-f05fbb6fb2b2

Published Date

2017

Language

English

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Faculty

Electrical Engineering, Mathematics and Computer Science

Department

Microelectronics

Research Group

Electronic Instrumentation

Abstract

This paper presents a comprehensive study of demodulation techniques for high-frequency self-oscillating eddy-current displacement sensor (ECDS) interfaces. Increasing the excitation frequency is essential for lowering the skin depth in many demanding industrial applications, that require better resolution. However, a high excitation frequency poses design challenges in the readout electronics, and particularly in the demodulation functional block. We analyze noise, linearity, and stability design considerations in amplitude demodulators for nanometer and sub-nanometer ECDSs. A number of state-of-the-art amplitude demodulation techniques employed in high-frequency ECDSs are reviewed, and their pros and cons are evaluated.

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