Compact and low-noise quartz-enhanced photoacoustic sensor for sub-ppm ethylene detection in atmosphere

Mid-infrared intracavity quartz-enhanced photoacoustic spectroscopy with pptv – Level sensitivity using a T-shaped custom tuning fork

“…Since its first demonstration in 2002 [1] , quartz-enhanced photoacoustic spectroscopy (QEPAS) has evolved into a widely employed technique for trace gas sensing. The popularity of QEPAS can be attributed to the very compact footprint of QEPAS sensors and small gas cell volumes [2] , [3] , the strong resonant enhancement of signals due to the high quality electro-mechanic resonance of the quartz tuning fork (QTF) transducer, and its acoustic quadrupole acoustic configuration yielding low sensitivity to ambient noise [4] . The concentration of gases detected with the QEPAS technique typically spans the range from percent to parts per billion (ppb).…”

Potentiometric Ethene Sensor for Postharvest Detection Applications

“…The sensor exhibited a wide linear response range and a limit of detection (LOD) at the ppm level. An all-in-one versatile gas sensor based on fiber enhanced Raman spectroscopy for monitoring postharvest fruit conservation and ripening was reported by Jochum et al 13 A gas sensor system based on quartz-enhanced photoacoustic spectroscopy was studied 14 for the detection of trace levels of ethene using a quantum cascade laser operating at ∼10.3 μm. A minimum detection limit of 30 part-per-billion in ethene concentration was obtained.…”