Results 151 to 160 of about 1,607 (170)

Theoretical analysis of a quartz-enhanced photoacoustic spectroscopy sensor

Applied Physics B, 2009
Quartz-enhanced photoacoustic spectroscopy (QEPAS) sensors are based on a recent approach to photoa- coustic detection which employs a quartz tuning fork as an acoustic transducer. These sensors enable detection of trace gases for air quality monitoring, industrial process control, and medical diagnostics.
N. Petra, J. Zweck, A. A. Kosterev, S. E. Minkoff, D. Thomazy   +4 more
openaire   +1 more source

New developments in THz quartz enhanced photoacoustic spectroscopy

SPIE Proceedings, 2016
We will report on new developments of quartz-enhanced photo-acoustic (QEPAS) sensor employing THz quantum cascade laser (QCLs). The extension of the QEPAS technique in the THz range was made possible by the realization of custom made QTFs. With the aim to improve the QTF acousto-electric transduction efficiency, we designed and realized new QTF designs.
Spagnolo V, Patimisco P, Sampaolo A, Giglio M, Vitiello MS, Scamarcio G, Tittel FK   +6 more
openaire   +3 more sources

Quartz Enhanced Photoacoustic Spectroscopy: Today and Beyond

Lasers, Sources and Related Photonic Devices, 2010
Current theoretical understanding and practical applications of the trace gas sensing technique called quartz enhanced photoacoustic spectroscopy (QEPAS) will be presented. Work in progress and planned QEPAS developments will be discussed.
openaire   +1 more source

Quartz Enhanced Photoacoustic Spectroscopy for Human Breath Analysis

Frontiers in Optics 2016, 2016
Simultaneous monitoring of several trace gases requires source tunability and highly sensitive detection. To serve this purpose a MIR-OPO light source pumping a quartz-enhanced photoacoustic sensor is demonstrated. The sensor targets exhaled human breath analysis.
M. Lassen, L. Lamard, Y. Feng, A. Peremans, J. C. Petersen   +4 more
openaire   +1 more source

Ethylene Trace Detection by Quartz Enhanced Photoacoustic Spectroscopy

Conference on Lasers and Electro-Optics/International Quantum Electronics Conference, 2009
Ethylene (C 2 H 4 ) absorption line intensity at 6172.95 cm−1 was determined for trace gas detection. C 2 H 4 trace concentration measurements were performed using quartz enhanced photoacoustic spectroscopy (QEPAS) with a sensitivity of 1.3 ppmv (1σ) for τ=1s time constant. The effect of modulation frequency accuracy on QEPAS signal was investigated.
K. Liu, T. Wu, X. Gao, W. Zhang, E. Fertein, W. Chen   +5 more
openaire   +1 more source

Optimal tuning fork for Quartz Enhanced PhotoAcoustic Spectroscopy

Conference on Lasers and Electro-Optics, 2016
Two custom tuning forks for quartz enhanced photoacoustic spectroscopy have been designed using analytical geometry optimization. Their performances are presented and they will be used in experiments to further improve the sensibility of the technique.
G. Aoust, R. Levy, M. Raybaut, J.-M. Melkonian, B. Bourgeteau, A. Godard, M. Lefebvre   +6 more
openaire   +1 more source

Double resonant quartz-enhanced photoacoustic spectroscopy with a spherical resonator

Optics Letters
In this Letter, double resonant quartz-enhanced photoacoustic spectroscopy (QEPAS) with a spherical resonator is proposed for the first time to our knowledge. This spherical resonator, which functions both as an acoustic resonator and a gas chamber, facilitates efficient sound wave coupling between the resonator and the quartz tuning fork (QTF ...
Chu Zhang, Shunda Qiao, Ying He, Yufei Ma   +3 more
openaire   +2 more sources

Quartz-Enhanced Photoacoustic Spectroscopy for Environmental Monitoring

Air pollution is a critical global issue, contributing to over 4.2 million deaths annually due to stroke, heart disease, lung cancer, and chronic respiratory diseases. It also poses significant economic and social challenges, including increased healthcare costs and reduced productivity. The need for real-time, high-resolution air quality monitoring is
Pietro Patimisco, Andrea Zifarelli, Raffaele De Palo, Mariagrazia Olivieri, Angelo Sampaolo, Vincenzo Spagnolo   +5 more
openaire   +1 more source

Tapered acoustic resonator-based quartz-enhanced photoacoustic spectroscopy

Optics Letters
In this paper, a quartz-enhanced photoacoustic spectroscopy (QEPAS) sensor based on a novel tapered acoustic resonator (TAR) was proposed for the first time, to our knowledge. The proposed structure not only enhances acoustic signals but also substantially reduces the demands on beam quality and optical alignment, leading to ...
Chenzhao Sang, Chu Zhang, Runqiu Wang, Shunda Qiao, Ying He, Yufei Ma   +5 more
openaire   +2 more sources

Application of standard and custom quartz tuning forks for quartz-enhanced photoacoustic spectroscopy gas sensing

Applied Spectroscopy Reviews, 2023
Leqing Lin, Wenguo Zhu, Xu Zhou
exaly