Effect of the dual library on long-range (3 km) SF 6 (Hexafluoride Sulfur) detection efficiency by portable Stand-off FTIR (Fourier Transform Infrared) detector

Abstract

A critical limitation in developing portable Fourier transform-infrared (FTIR) stand-off chemical detectors is the detection library optimization, which reduces the number of false alarms and maintains the detection performance. Ideally, a detection library should be established through high-resolution (0.5 cm-1) FTIR spectroscopy in the laboratory. However, owing to the weight requirement of a portable FTIR stand-off detector, its optical system and mirror-moving range have limitations. Consequently, most portable FTIR stand-off detectors have been developed with a low resolution of approximately 4–16 cm-1. In this study, we developed a portable FTIR stand-off detector with a dual library of SF6. Moreover, we investigated its detection efficiency effect depending on the single library condition through realistic long-range (3 km) SF6 spectrum data in a field test.