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.
GC-QEPAS: A MEMS-ENABLED PORTABLE TRACE CHEMICAL SENSOR FOR SAFETY & SECURITY APPLICATIONS
Elmi Ivan;Masini Luca;Tamarri Fabrizio;Sanmartin Michele;Zampolli Stefano
2019
Abstract
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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
