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Lookup Table Optimization for Sensor Linearization in Small Embedded Systems

Journal article
Authors Lars Bengtsson
Published in Journal of Sensor Technology
Volume 2
Issue 4
Pages 177-184
ISSN 2161-122X
Publication year 2012
Published at Department of Physics (GU)
Pages 177-184
Language en
Links www.scirp.org/journal/PaperInformat...
https://gup.ub.gu.se/file/88863
Keywords Lookup Table; Sensor Linearization; Embedded Systems; Interpolation
Subject categories Accelerator Physics and Instrumentation, Electronic measurement and instrumentation, Embedded Systems

Abstract

This paper treats the problem of designing an optimal size for a lookup table used for sensor linearization. In small em- bedded systems the lookup table must be reduced to a minimum in order to reduce the memory footprint and intermedi- ate table values are estimated by linear interpolation. Since interpolation introduces an estimation uncertainty that in- creases with the sparseness of the lookup table there is a trade-off between lookup table size and estimation precision. This work will present a theory for finding the minimum allowed size of a lookup table that does not affect the overall precision, i.e. the overall precision is determined by the lookup table entries’ precision, not by the interpolation error.

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