Detection tests
Development of a multi-gas sensor

To test the performance of our system for VOC detection, we selected four analytes representing four different chemical families (table 1).

A gas dilution bench has been set up upstream of the detection cell to enable detection tests to be carried out on the various VOCs. The experiments consist in alternately exposing the microbalances to pure air, then to air polluted by a VOC vapor. For each vapor, a mother bottle supplied by Air Liquide is available: MEC 400 ppmv, CH₂Cl₂ 750 ppmv, toluene 200 ppmv and C₆H₁₂ 600 ppmv in pure air. Sensors are exposed to 100%, 50% and 25% of the mother bottle concentration for 10 minutes.