IMPROVING PERFORMANCE OF ENCODERS BASED SYSTEMS USING WAVELET TECHNIQUES

J. M. D. Pereira, O. Postolache, P. Girao

Abstract

This paper aims at the accuracy improvement of low-cost encoders based systems. Calibration data together with the approximations and details of wavelet decomposition are used to obtain some important parameters of absolute encoders. Differential and integral non-linear errors are estimated and their values are used to increase measurement accuracy. An error compensated system can easily be obtained by including the encoder, a microcontroller and a memory with a code conversion table. Simulation and experimental results, obtained from a low-cost angular encoder, are used to validate the proposed characterisation method based on wavelet data processing.

Keywords

encoders, wavelet transforms, error compensation

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IMEKO-TC7-2004-077.pdf

DOI

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IMEKO TC

TC7 - Measurement Science

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