VECTORIAL IMPEDANCE METER FOR GAS CHEMICAL ANALYSIS

摘要

In this paper two digital correction techniques are presented aiming at enhancing the measurement accuracy of an electronic nose. The equipment operates as a vectorial impedance meter in the frequency range 0-15 MHz. The digital correction techniques allow compensating for the conditioning electronic response. Linear behaviour is assumed, cross-talk, amplitude and phase distortions are accounted for by a black box two-ports model. The model parameters are evaluated either with a set of measurements, spanning the whole frequency range, and by a single measurement by exploiting autoregressive (ARX) models.