SINUSOIDAL FITTING USING EXACT LINEARIZATION APPLIED TO BIOIMPEDANCIMETRIC MEASUREMENTS

ROSSANA E. MADRID, ENRIQUE M. SPINELLI AND CARMELO J. FELICE

Hong Kong, China

Conferencia; 20th Annual International Conference of the IEEE EMBS; 1998

Microbial growth can be continuously followed up by measuring the interface impedance Zi of two electrodes immersed in a culture medium. A new method based on sinusoidal fitting is used to reduce measurement errors. It applies an exact linearization with which it is possible to obtain a linear relationship of the parameters to be estimated. This permits the application of the least squares procedure, producing pure sinusoidal waves, which greatly reduce the error in the determination of the interface impedance amplitude and phase components.