Results 61 to 70 of about 1,073 (164)

Small-Size Resonant Photoacoustic Cell of Inclined Geometry for Gas Detection

, 2009
A photoacoustic cell intended for laser detection of trace gases is represented. The cell is adapted so as to enhance the gas-detection performance and, simultaneously, to reduce the cell size.
A. L. Ulasevich, A. Miklos, A. Olafsson, A. V. Gorelik, A.A. Kosterev, A.A. Kosterev, A.K.Y. Ngai, A.V. Gorelik, B.A. Paldus, D. Hofstetter, E. Huang, F. N. Nikonovich, F.G.C. Bijnen, F.J.M. Harren, F.R.E. Gruijl, J. Oomens, L.R. Narasimhan, M. P. Zakharich, M.B. Pushkarsky, M.M.J.W. Herpen van, N. S. Kazak, P. Kestler, R. Flindt, R. Lewicki, R.A. Rooth, R.F. Curl, S. Bernegger, S.L. Firebaugh, V. A. Firago, V. S. Starovoitov, V.P. Zharov, V.S. Starovoitov, V.S. Starovoitov, W. Urban, W.J. Witteman   +34 more
core   +1 more source

High-concentration methane and ethane QEPAS detection employing partial least squares regression to filter out energy relaxation dependence on gas matrix composition

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, Andrea Zifarelli, Angelo Sampaolo, Pietro Patimisco, Marilena Giglio, Nicola Amoroso, Hongpeng Wu, Lei Dong, Roberto Bellotti, Vincenzo Spagnolo   +9 more
doaj   +1 more source

Highly Sensitive Trace Gas Detection Based on In-Plane Single-Quartz-Enhanced Dual Spectroscopy

Sensors, 2022
For this invited manuscript, an in-plane single-quartz-enhanced dual spectroscopy (IP-SQEDS)-based trace gas sensor was demonstrated for the first time.
Tiantian Liang, Shunda Qiao, Ziting Lang, Yufei Ma   +3 more
doaj   +1 more source

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.
Yufei Ma
doaj   +1 more source

Simultaneous dual-gas QEPAS detection based on a fundamental and overtone combined vibration of quartz tuning fork [PDF]

, 2017
A dual-gas quartz-enhanced photoacoustic spectroscopy (QEPAS) sensor system based on a frequency division multiplexing technique of a quartz tuning fork (QTF) was developed and experimentally demonstrated.
Dong, Lei, Jia, Suotang, Ma, Weiguang, Patimisco, Pietro, Pei, Kailong, Sampaolo, Angelo, Spagnolo, Vincenzo, Tittel, Frank K., Wu, Hongpeng, Xiao, Liantuan, Yin, Wangbao, Yin, Xukun, Zhang, Lei, Zheng, Huadan   +13 more
core   +1 more source

Trace gas sensing based on multi-quartz-enhanced photothermal spectroscopy [PDF]

, 2020
A multi-quartz-enhanced photothermal spectroscopy (M-QEPTS) based trace gas detection method is reported for the first time. Different from traditional QEPTS sensor employing a single quartz tuning fork (QTF) as a photothermal detector, two QTFs were ...
He, Ying, Hu, Yinqiu, Ma, Yufei, Qiao, Shunda, Tittel, Frank K.   +4 more
core   +1 more source

SNR Improvement of QEPAS System by Preamplifier Circuit Optimization and Frequency Locked Technique

Photonic Sensors, 2018
Preamplifier circuit noise is of great importance in quartz enhanced photoacoustic spectroscopy (QEPAS) system. In this paper, several noise sources are evaluated and discussed in detail.
Qinduan Zhang, Jun Chang, Zongliang Wang, Fupeng Wang, Fengting Jiang, Mengyao Wang   +5 more
doaj   +1 more source

Quartz-enhanced photoacoustic spectroscopic methane sensor system using a quartz tuning fork-embedded, double-pass and off-beam configuration

Photoacoustics, 2020
Development of a methane (CH4) sensor system was reported based on a novel quartz-tuning-fork (QTF)-embedded, double-pass, off-beam quartz-enhanced photoacoustic spectroscopy (DP-OB-QEPAS).
Lien Hu, Chuantao Zheng, Minghui Zhang, Dan Yao, Jie Zheng, Yu Zhang, Yiding Wang, Frank K. Tittel   +7 more
doaj   +1 more source

Methane, ethane and propane detection using a compact quartz enhanced photoacoustic sensor and a single interband cascade laser [PDF]

, 2019
Hydrocarbon detection in the gas phase represents a powerful tool to guide oil exploration and production operations for the oil & gas industry. This application requires highly sensitive, selective and robust spectroscopic techniques.
Csutak, Sebastian, Deffenbaugh, Max, Giglio, Marilena, Menduni, Giansergio, Passaro, Vittorio, Patimisco, Pietro, Sampaolo, Angelo, Spagnolo, Vincenzo, Tittel, Frank K.   +8 more
core   +1 more source

Broadband detection of methane and nitrous oxide using a distributed-feedback quantum cascade laser array and quartz-enhanced photoacoustic sensing [PDF]

, 2020
Here we report on the broadband detection of nitrous oxide (N2O) and methane (CH4) mixtures in dry nitrogen by using a quartz-enhanced photoacoustic (QEPAS) sensor exploiting an array of 32 distributed-feedback quantum cascade lasers, within a spectral ...
Blanchard, Romain, Dong, Lei, Elefante, Arianna, Giglio, Marilena, Menduni, Giansergio, Passaro, Vittorio M. N., Patimisco, Pietro, Pfluegl, Christian, Sampaolo, Angelo, Spagnolo, Vincenzo, Tittel, Frank K., Vakhshoori, Daryoosh, Witinski, Mark F., Wu, Hongpeng, Zifarelli, Andrea   +14 more
core   +1 more source