Results 1 to 10 of about 825 (180)

Optomechanical energy enhanced BF-QEPAS for fast and sensitive gas sensing [PDF]

Photoacoustics
Traditional beat frequency quartz-enhanced photoacoustic spectroscopy (BF-QEPAS) are limited by short energy accumulation times and the necessity of a decay period, leading to weaker signals and longer measurement cycles.
Weilin Ye, Linfeng He, Weihao Liu, Zhile Yuan, Kaiyuan Zheng, Guolin Li   +5 more
doaj   +3 more sources

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, Youhong Xiao
exaly   +4 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

Capteur QEPAS utilisant un résonateur radial

Applied Physics B, 2021
International audienceWe report on the use of a radial acoustic resonator to increase the acoustic signal of a quartz enhanced photoacoustic spectroscopy (QEPAS) sensor.
Raybaut, Myriam, Aoust, Guillaume, Duquesnoy, Maxime, Godard, Antoine, Melkonian, Jean-Michel, Levy, Raphaël   +5 more
core   +2 more sources

Spatially engineered optical–acoustic matching in quartz-enhanced photoacoustic spectroscopy [PDF]

Photoacoustics
Quartz-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, Wenfei Han, Chenglong Wang, Chunxia Li, Yingzhang Ren, Xinran Li, Jiale Xu, Vincenzo Spagnolo, Weidong Chen, Hongpeng Wu, Lei Dong   +10 more
doaj   +2 more sources

Photoacoustic gas detection with LED QEPAS

2011 Conference on Lasers and Electro-Optics Europe and 12th European Quantum Electronics Conference (CLEO EUROPE/EQEC), 2022
S.555Various configurations and applications have been investigated and realized since the pioneering introduction of quartz-enhanced photoacoustic spectroscopy (QEPAS) by Kosterev et al. in 2002 [1].
Schade, W., Angelmahr, M., Böttger, S.
core   +2 more sources

New signal processing for fast and precise QEPAS measurements [PDF]

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, 2020
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 tuning fork to enable high sensitivity and high selectivity ...
Raybaut, Myriam, Levy, Raphael, Aoust, Guillaume, Duquesnoy, Maxime, Melkonian, Jean-Michel   +4 more
core   +3 more sources

Sensitivity improvement of quartz-enhanced photoacoustic spectroscopy using the stochastic resonance method [PDF]

Photoacoustics
Quartz-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, Hao Xiong, Shiling Feng, Ning Pan, Chuan Li, Yixuan Liu, Ye Zhang, Ligang Shao, Gaopeng Lu, Kun Liu, Guishi Wang   +10 more
doaj   +2 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,
Mengali, Sandro, Elmi, Ivan, Zampolli, Stefano, Nicola Liberatore, Luca Masini, Ivan Elmi, Stefano Zampolli, Masini, Luca, Zardi, Federico, Viola, Roberto, Federico Zardi, Sandro Mengali, Liberatore, Nicola, Roberto Viola   +13 more
core   +4 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.
Liu, Hao, Lu Yao, Yao, Lu, Chen, Xiang, Xiang Chen, Mai Hu, Kan, Ruifeng, Ruifeng Kan, Hu, Mai, Deng, Hao, Zhenyu Xu, Xu, Zhenyu, Hao Deng, Hao Liu   +13 more
core   +4 more sources