Quartz Enhanced Photoacoustic Spectroscopy for Detection of Improvised Explosive Devices and Precursors

Figure 12

Absorption spectra of 200 ppm of nitromethane obtained with our QEPAS sensor (multicolor plots). Also peaks from water were clearly observed, since vapours were generated starting from a liquid mix of nitromethane and water. The high resolution spectrum of 1 ppm nitromethane from the PNNL database is also shown for reference (in the inset).