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
A Miniaturized 3D-Printed Quartz-Enhanced Photoacoustic Spectroscopy Sensor for Methane Detection with a High-Power Diode Laser [PDF]
Sensors, 2023 In this invited paper, a highly sensitive methane (CH4) trace gas sensor based on quartz-enhanced photoacoustic spectroscopy (QEPAS) technique using a high-power diode laser and a miniaturized 3D-printed acoustic detection unit (ADU) is demonstrated for ...
Yanjun Chen +3 more
doaj +2 more sources
Compact GC-QEPAS for On-Site Analysis of Chemical Threats. [PDF]
Sensors (Basel), 2022 This paper reports on a compact, portable, and selective chemical sensor for hazardous vapors at trace levels, which is under development and validation within the EU project H2020 “RISEN”. Starting from the prototype developed for a previous EU project, here, we implemented an updated two-stage purge and trap vapor pre-concentration system, a more ...
Liberatore N +6 more
europepmc +4 more sources
Towards low-cost QEPAS sensors for nitrogen dioxide detection
Photoacoustics, 2020 Increasing awareness of the adverse health effects of air pollution leads to a demand of low-cost sensors for the measurement of pollutants such as NO2.
P. Breitegger +5 more
doaj +3 more sources
Ppb-level NH3 photoacoustic sensor combining a hammer-shaped tuning fork and a 9.55µm quantum cascade laser [PDF]
Photoacoustics, 2023 We present a quartz enhanced photoacoustic spectroscopy (QEPAS) gas sensor designed for precise monitoring of ammonia (NH3) at ppb-level concentrations.
Shangzhi Li +8 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 +3 more
core +4 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
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
Study and Characterization of Silicon Nitride Optical Waveguide Coupling with a Quartz Tuning Fork for the Development of Integrated Sensing Platforms [PDF]
SensorsThis work demonstrates an ultra-compact optical gas-sensing system, consisting of a pigtailed laser diode emitting at 1392.5 nm for water vapor (H2O) detection, a silicon nitride (Si3N4) optical waveguide to guide the laser light, and a custom-designed ...
Luigi Melchiorre +7 more
doaj +2 more sources
Sub-ppb level HCN photoacoustic sensor employing dual-tube resonator enhanced clamp-type tuning fork and U-net neural network noise filter [PDF]
PhotoacousticsHydrogen cyanide (HCN) is a toxic industrial chemical, necessitating low-level detection capabilities for safety and environmental monitoring. This study introduces a novel approach for detecting hydrogen cyanide (HCN) using a clamp-type custom quartz ...
Lihao Wang +11 more
doaj +2 more sources