A Miniaturized QEPAS Trace Gas Sensor with a 3D-Printed Acoustic Detection Module
Sensors, 2017 A 3D printing technique was introduced to a quartz-enhanced photoacoustic spectroscopy (QEPAS) sensor and is reported for the first time. The acoustic detection module (ADM) was designed and fabricated using the 3D printing technique and the ADM volume ...
Xiaotao Yang, Frank Tittel
exaly +4 more sources
Assessment of vibrational-translational relaxation dynamics of methane isotopologues in a wet-nitrogen matrix through QEPAS [PDF]
Photoacoustics, 2023 Here we report on a study of the non-radiative relaxation dynamic of 12CH4 and 13CH4 in wet nitrogen-based matrixes by using the quartz-enhanced photoacoustic spectroscopy (QEPAS) technique.
Mariagrazia Olivieri +9 more
doaj +3 more sources
Review of Recent Advances in QEPAS-Based Trace Gas Sensing
Applied Sciences, 2018 Quartz-enhanced photoacoustic spectroscopy (QEPAS) is an improvement of the conventional microphone-based photoacoustic spectroscopy. In the QEPAS technique, a commercially available millimeter-sized piezoelectric element quartz tuning fork (QTF) is used
Yufei Ma
doaj +2 more sources
Spatially engineered optical–acoustic matching in quartz-enhanced photoacoustic spectroscopy [PDF]
PhotoacousticsQuartz-enhanced photoacoustic spectroscopy (QEPAS) offers high sensitivity for trace-gas detection, but its performance is often limited by a spatial mismatch between distributed photoacoustic excitation and the intrinsic sensitivity region of the quartz
Ruyue Cui +10 more
doaj +2 more sources
New Signal Processing for Fast and Precise QEPAS Measurements [PDF]
IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, 2020 Quartz-enhanced photoacoustic spectroscopy (QEPAS) gas sensors have been widely developed over the last decade. This technique takes the advantage of a high quality factor tuning fork to enable high-sensitivity and high-selectivity miniature gas sensors.
Raphael Levy +4 more
openaire +3 more sources
Sensitivity improvement of quartz-enhanced photoacoustic spectroscopy using the stochastic resonance method [PDF]
PhotoacousticsQuartz-enhanced photoacoustic spectroscopy (QEPAS) is a promising technique for trace gas sensing, offering advantages such as compact size and high sensitivity. However, noise remains a critical factor limiting detection sensitivity.
Yingchao Xie +10 more
doaj +2 more sources
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
Compact GC-QEPAS for On-Site Analysis of Chemical Threats
Sensors, 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 ...
Nicola Liberatore +6 more
openaire +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
Frequency-Domain Detection for Frequency-Division Multiplexing QEPAS
Sensors, 2022 To achieve multi-gas measurements of quartz-enhanced photoacoustic spectroscopy (QEPAS) sensors under a frequency-division multiplexing mode with a narrow modulation frequency interval, we report a frequency-domain detection method. A CH4 absorption line at 1653.72 nm and a CO2 absorption line at 2004.02 nm were investigated in this experiment.
Xiang Chen 0030 +6 more
openaire +5 more sources