Utilización de una nariz electrónica tipo QCM para la evaluación de la calidad aromática en pera y manzana

Abstract

The "Libra Nose" electronic nose has eight Quartz Microbalance Sensors. When gas molecules are adsorbed onto the quartz crystal surface, the oscillation frequency changes in proportion to the amount of mass. The response of sensors depends on numerous factors that may be difficult to control, sucha as the temperature and the humidity of the carrier gas. All these factors cuase changes in the selectivity of sensors affectin the reproducibility of measurements. In this paper additive a multiplicative corrections are proposed to be applied to the raw sensors´ signal in order to eliminate sources of variations. After thses corrections, the sensors´ response gives useful information to distinguish between batch of apples and pears with different ripeness level.