Gas identification by dynamic measurements of SnO2 sensors

JUAN VOROBIOF; BOSELLI, ALFREDO; DANIEL F. RODRIGUEZ; ALBERTO LAMAGNA; CARLOS A. RINALDI

AIP CONFERENCE PROCEEDINGS

AMER SCIENTIFIC PUBLISHERS

Año: 2011 vol. 1362 p. 239 - 240

0094-243X

It is well know that the use of chambers with the sensors in the e‐nose improves the measurements, due to a constant gas flow and the controlled temperature sensors[1]. Normally, the chamber temperature is above room temperature due to the heat generated by the heater of sensors. Also, the chamber takes a long time to reach a stable equilibrium temperature and it depends on enviromental conditions. Besides, the temperature variations modify the humidity producing variations in resistance measurements[2]. In this work using a heater system that controls the temperature of the chamber, the desorption process on SnO2 sensor array was study[3]. Also, it was fitted the data signal sensors using a two exponential decay functions in order to determine the desorbing constant process. These constants were used to classify and identify different alcohols and their concentrations.