DSP BASED READ OUT SYSTEM FOR CONTACTLESS HIGH-FREQUENCY INDUCTIVE POSITION SENSORS

B. Aschenbrenner, B. G. Zagar

Abstract

This paper presents a precise and low cost absolute position inductive measurement system for rough industrial environments. This transducer works on similar principles as contactless resolvers but consists of a rectangular antenna PCB, a passive LC resonance target and a signal processing unit. The read out electronics utilize undersampling to demodulate the transducer in{phase and quadrature output signals. Furthermore, the corresponding position is estimated from a lookup table (LUT) to avoid singularities in the inverse tangent and cotangent calculation. The mechanical transducer arrangement, signal condition electronics design and measured results will be presented.

Keywords

inductive sensor, contactless, undersampling, quadrature, synchronous demodulation

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IMEKO-WC-2012-TC7-O13.pdf

DOI

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IMEKO TC

TC7 - Measurement Science

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