Analysis and Validation of a Planar High-Frequency Contactless Absolute Inductive Position Sensor

This paper presents a low cost precise and reliable inductive absolute position measurement system. It is suitable for rough industrial environments, offers a high inherent resolution (0.1%-0.01% of measurement range), can measure target position over a wide measurement range, and can potentially me...

Full description

Saved in:

Bibliographic Details
Published in:	IEEE transactions on instrumentation and measurement 2015-03, Vol.64 (3), p.768-775
Main Authors:	Aschenbrenner, Bernhard, Zagar, Bernhard G.
Format:	Article
Language:	eng
Subjects:	Coils Couplings Crosstalk Displacement measurement inductors Mathematical models mutual coupling parasitic capacitance Position measurement Printed circuit boards printed circuits Q factor Receivers Resonant frequency RLC circuits Sensors
Online Access:	Get full text
Tags:	Add Tag No Tags, Be the first to tag this record!

Description
Summary:	This paper presents a low cost precise and reliable inductive absolute position measurement system. It is suitable for rough industrial environments, offers a high inherent resolution (0.1%-0.01% of measurement range), can measure target position over a wide measurement range, and can potentially measure multiple target locations simultaneously. The basic position resolution is improved by adding two additional finer pitched receive channels. The sensor works on principles similar to contactless resolvers. It consists of a rectangular antenna printed circuit board and a passive LC resonant circuit. A mathematical model and the equivalent circuit of this kind of sensor are explained in detail. Such sensors suffer from transmitter to receiver coil capacitive crosstalk, which results in a phase sensitive offset. This crosstalk will be analyzed by measurements. Moreover, the mechanical transducer arrangement, the measurement setup, and the measured results will be presented.
ISSN:	0018-9456 1557-9662