THE INFLUENCE OF ERROR STRUCTURE ON INTERPRETATION OF IMPEDANCE SPECTRA

The influence of error structure on interpretation of impedance measur ements is demonstrated for electro-hydrodynamic impedance spectra. The stochastic component of the error structure was determined through us e of measurement models, and a three-parameter model for the error str ucture was identified. The measurement model was also used to identify portions of the impedance spectra that were not corrupted by bias err ors. Regression employing weighting by the stochastic component of the error structure yielded unambiguous values for physical properties su ch as the Schmidt number, whereas significant ambiguity was observed u sing modulus or proportional weighting.