This paper reports on a portable selective sensor for trace levels of hazardous vapors, which combines a two stage purge and trap vapor pre-concentration system, a MEMS gas-chromatographic (GC) separation column and a miniaturized quartz-enhanced photoacoustic spectroscopy (QEPAS) detector. This is the first demonstration of a miniaturized QEPAS device used as spectroscopic detector downstream of a FAST-GC separation column, demonstrating two-dimensional selectivity and enabling real-world analyses in dirty environments with response time of a few minutes. Furthermore, the integrated sensing system was specifically designed to be rugged and suitable to be deployed on unmanned robotic ground vehicles.
23 Jun 2019
2019 20th International Conference on Solid-State Sensors, Actuators and Microsystems & Eurosensors XXXIII (TRANSDUCERS & EUROSENSORS XXXIII)