Technologies for Smart Sensors and Sensor Fusion

11	Toward Unsupervised Smart Chemical Sensor Arrays

Leonardo Tomazeli Duarte and Christian Jutten

CONTENTS

11.1    Introduction

11.2    Smart Chemical Sensor Arrays

11.2.1    Potentiometric Sensors

11.2.2    Selectivity Issues in Potentiometric Sensors

11.2.3    Chemical Sensor Arrays

11.3    BSS

11.3.1    Problem Description

11.3.2    Strategies to Perform BSS

11.3.2.1    ICA Methods

11.3.2.2    Bayesian Approach

11.3.3    Nonlinear Mixtures

11.4    Application of BSS Methods to Chemical Sensor Arrays

11.4.1    First Results

11.4.2    ICA-Based Methods for the Case with Different Valences

11.4.3    Use of Prior Information to Estimate the Electrode’s Slope

11.4.4    Bayesian Source Separation Applied to Chemical Sensor Arrays

11.5    Practical ...