Construcción de un sistema de bajo costo para el uso y evaluación de sensores semiconductores para gases

Tin dioxide semiconductor gas sensors represent an alternative for gas detection in air because its simplicity and low cost. This coupled with the need for a computer based interface, makes them ideal for developing multidisciplinary projects with students from areas such as Chemistry, Electrical Engineering, Electronics and Computer Science. This document shows the construction of a low cost system for evaluation of semiconductor gas sensors. This system consists of an exposure chamber, an electronic interface to manipulate the sensor and to transfer data to the computer and a methane generator for use in the laboratory.