Results 11 to 20 of about 2,335 (228)
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 +9 more
doaj +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 +4 more sources
Quartz Enhanced Photoacoustic Spectroscopy on Solid Samples [PDF]
SensorsQuartz-Enhanced Photoacoustic Spectroscopy (QEPAS) is a technique in which the sound wave is detected by a quartz tuning fork (QTF). It enables particularly high specificity with respect to the excitation frequency and is well known for an ...
Judith Falkhofen +3 more
doaj +5 more sources
Photoacoustics, 2022 In this paper, a highly sensitive and integrated near-infrared CO2 sensor was developed based on quartz-enhanced photoacoustic spectroscopy (QEPAS).
Yihua Liu +9 more
doaj +2 more sources
High-Power DFB Diode Laser-Based CO-QEPAS Sensor: Optimization and Performance
Sensors, 2018 A highly sensitive carbon monoxide (CO) trace gas sensor based on quartz-enhanced photoacoustic spectroscopy (QEPAS) was demonstrated. A high-power distributed feedback (DFB), continuous wave (CW) 2.33 μm diode laser with an 8.8 mW output power was used ...
Yufei Ma +4 more
doaj +3 more sources
Off-Beam Acoustic Micro-Resonator for QEPAS Sensor with a Custom Quartz Tuning Fork
AtmosphereQuartz-enhanced photoacoustic spectroscopy (QEPAS) has shown great promise for monitoring greenhouse gases and pollutants with a high measurement accuracy and limit of detection.
Yong Wang +8 more
doaj +2 more sources
Sensors, 2017 All the preamplifiers dedicated for Quartz Enhanced PhotoAcoustic Spectroscopy (QEPAS) applications that have so far been reported in the literature have been based on operational amplifiers working in transimpedance configurations.
Tomasz Starecki, Piotr Z. Wieczorek
doaj +3 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
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
New Signal Processing for Fast and Accurate QEPAS Measurements [PDF]
2018 IEEE International Ultrasonics Symposium (IUS), 2018 Quartz 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 miniature gas sensors.
Ranhael Levy +3 more
openaire +4 more sources