Dynamic analysis of Love waves sensors responses: application to organophosphorus compounds in dry and wet air

Abstract

The Love wave sensor, made of quartz substrate with SiO2 as guiding layer and a polysiloxane sensitive coating, was put in the retroaction loop of an oscillator, in order to access the wave phase velocity thanks to the oscillator frequency. Experiments were done with two organophosphorus compounds: GB and dimethylmethylphosphonate (DMMP), with dry and wet air as gas vector. The purpose of this paper is to extract unexploited aspects of the sensors responses that allow measurements analysis, and even quantification, without waiting for steady state. Four transient parameters have been selected for a principal component analysis. As expected a plot regroups measurements by concentrations, then it is explained how this method can be a calibration for a later functional sensor.