The Application of the Allan Variance to the Study of the Noise Properties of Adsorption-Desorption Phenomena in Chemical Sensors

摘要

A method to investigate the characteristics of noise of the adsorption-desorption phenomena is presented. The method is based on the Allan variance which allows the evaluation of noise spectral density also in case of 1/f or lorentzian noise. A first application to Quartz Microbalances coated with metalloporphyrins interacting with volatile comopunds is reported. Preliminary results show a 1/f noise component in adsorption phenomena.