A NOVEL METHOD OF ESTIMATING DYNAMIC MEASUREMENT ERRORS

J.P. Hessling

Abstract

A method for estimating an upper bound of the dynamic measurement error in the time domain is derived, starting from the transfer function of the system. Labeled response uncertainty, this dynamic error bound can be included in the conventional measurement uncertainty. A typical system for measuring force, pressure or acceleration is here evaluated using this measure. The linear dynamic error arises for two reasons: Varying amplification and delay with frequency. The latter is analogous to the wellknown bandwidth limiting dispersion of signals in transmission systems. For wide spectrum signals/pulses the asymptotic tails of the spectra may generate the major part of the error. No widespread robust, general and systematic method of quantifying the measurement error caused by these effects exists, despite that they may generate signal distortion far beyond the common prediction.

Keywords

dynamic, uncertainty, error, distortion, delay

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PWC-2006-TC22-014u.pdf

DOI

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IMEKO TC

TC22 - Vibration Measurement

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