Vibrational Fingerprinting of Gas Mixtures Using COCO-QEPAS. [PDF]
Sensors (Basel)Detection and simultaneous monitoring of multiple trace gases is vital in scientific and industrial processes. Here, we use coherent control in quartz-enhanced photoacoustic spectroscopy (COCO-QEPAS) with an in situ learning method for rapid fingerprinting of trace gases to identify and monitor arbitrary gases at very low concentrations, without prior ...
Angstenberger S +4 more
europepmc +4 more sources
Optical synchronous signal demodulation-based quartz-enhanced photoacoustic spectroscopy for remote, multi-point methane detection in complex environments [PDF]
PhotoacousticsWe present a novel optical synchronized signal demodulation (OSSD) method applied in quartz-enhanced photoacoustic spectroscopy (QEPAS) for remote gas sensing. Using 1 % of the laser source as an optical synchronization signal, kilometer-scale remote gas
Bo Sun +9 more
doaj +2 more sources
A Deep Learning Approach to Investigating Clandestine Laboratories Using a GC-QEPAS Sensor [PDF]
ChemosensorsIllicit drug production in clandestine laboratories involves the use of large quantities of different chemicals that can be obtained for legitimate purposes.
Giorgio Felizzato +5 more
doaj +3 more sources
Passive Electrical Damping of a Quartz Tuning Fork as a Path to Fast Resonance Tracking in QEPAS
Sensors, 2021 In Quartz-Enhanced PhotoAcoustic Spectroscopy (QEPAS) gas sensors, the acoustic wave is detected by the piezoelectric Quartz Tuning Fork (QTF). Due to its high-quality factor, the QTF can detect very low-pressure variations, but its resonance can also be
Roman Rousseau +4 more
doaj +2 more sources
New signal processing for fast and accurate QEPAS measurements [PDF]
2018 IEEE International Ultrasonics Symposium (IUS), 2018 International audienceQuartz Enhanced Photoacoustic Spectroscopy (QEPAS) gas sensors have been widely developed over the last decade. This technique takes advantage of a high quality factor micro tuning fork to enable high detectivity & high selectivity ...
Aoust, Guillaume +11 more
core +2 more sources
Greenhouse Gases Detection Exploiting a Multi-Wavelength Interband Cascade Laser Source in a Quartz-Enhanced Photoacoustic Sensor [PDF]
SensorsThis study presents the performance of a multi-gas sensor for greenhouse detection based on quartz-enhanced photoacoustic spectroscopy (QEPAS). The QEPAS sensor exploits an innovative, compact three-wavelength laser module as excitation source.
Raffaele De Palo +10 more
doaj +2 more sources
Recent Advances in QEPAS and QEPTS Based Trace Gas Sensing: A Review
Frontiers in Physics, 2020 This invited review paper summarizes and discusses developments of QTF based state-of-the-art quartz-enhanced photoacoustic spectroscopy (QEPAS) and quartz-enhanced photothermal spectroscopy (QEPTS) gas sensing techniques over the past 3 years.
, Ma Yufei
exaly +3 more sources
Mid-infrared fiber-coupled QCL-QEPAS sensor
Applied Physics B, 2013 An innovative spectroscopic system based on an external cavity quantum cascade laser (EC-QCL) coupled with a mid-infrared (mid-IR) fiber and quartz enhanced photoacoustic spectroscopy (QEPAS) is described.
Kriesel J. +11 more
core +3 more sources
Photoacoustics, 2022 A quartz enhanced photoacoustic spectroscopy (QEPAS) sensor capable to detect high concentrations of methane (C1) and ethane (C2) is here reported. The hydrocarbons fingerprint region around 3 µm was exploited using an interband cascade laser (ICL).
Giansergio Menduni +2 more
exaly +3 more sources
Effect of gas turbulence in quartz-enhanced photoacoustic spectroscopy: A comprehensive flow field analysis [PDF]
PhotoacousticsHere we present a computational and experimental fluid dynamics study for the characterization of the flow field within the gas chamber of a Quartz-Enhanced Photoacoustic Spectroscopy (QEPAS) sensor, at different flow rates at the inlet of the chamber ...
Andrea Zifarelli +9 more
doaj +2 more sources