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Design and analysis of an eddy current displacement sensor with extended linear range.

Authors :
Xu, Chunming
Yuan, Shuai
Liu, Meijuan
Source :
Sensors & Actuators A: Physical. Apr2024, Vol. 368, pN.PAG-N.PAG. 1p.
Publication Year :
2024

Abstract

Eddy current displacement sensor (ECDS) is a non-contact sensing device. This paper proposes an ECDS by using the colpitts circuit with the characteristics of longer measurement range and better linearity. The parameter R p is separated from an improved colpitts circuit. By measuring R p and optimizing probe sensitivity, the measurement range of the sensor is increased, which extends to 56% of probe diameter, the maximum measurement distance reaches 72% of probe diameter. A linear-fitting method based on MCU is proposed, which improves the linearity, consistency, and response speed of the sensor. The principle and design are explained in detail, and verified through field circuit coupling simulation. Finally, the ECDS is tested by using a precision electronically controlled displacement platform, the experiment results show that the sensor performance has a high consistency, and linearity can be reduced to within ± 0.4%, sensitivity is 0.28 V/mm, resolution is 6 µm. The ECDS is identified to be practical, the method proposed in this article effectively improves the measurement range and linearity, therefore, the ECDS is widely used in displacement measurement, which need long distance, high precision and fast response. [Display omitted] • By optimizing probe sensitivity, the measurement range of the sensor is increased. • The design is verified by using a field circuit coupling simulation method. • A linear-fitting method improves the linearity, consistency and response time. • Measurement range reach 56% of probe diameter, linearity is within ± 0.40%. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
09244247
Volume :
368
Database :
Academic Search Index
Journal :
Sensors & Actuators A: Physical
Publication Type :
Academic Journal
Accession number :
175458065
Full Text :
https://doi.org/10.1016/j.sna.2024.115100