Results 51 to 60 of about 3,994 (183)

1D U-Net Enhanced QEPAS Sensor for Trace Water Vapor Detection

Optics
We report a deep learning-assisted quartz-enhanced photoacoustic spectroscopy (QEPAS) sensor for trace water vapor detection in air. A 1392 nm butterfly-packaged DFB laser is wavelength-modulated at f0/2, and the QEPAS signal is retrieved by second ...
Huiming Xiao, Jiahui Wu, Haoyang Lin, Lihao Wang, Jianfeng He, Leqing Lin, Ruobin Zhuang, Guantian Hong, Jiabao Xie, Jianhui Yu, Wenguo Zhu, Yongchun Zhong, Zhigang Song, Huadan Zheng   +13 more
doaj   +1 more source

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   +1 more source

Highly Sensitive Capacitive MEMS for Photoacoustic Gas Trace Detection

Sensors, 2023
An enhanced MEMS capacitive sensor is developed for photoacoustic gas detection. This work attempts to address the lack of the literature regarding integrated and compact silicon-based photoacoustic gas sensors. The proposed mechanical resonator combines
Tarek Seoudi, Julien Charensol, Wioletta Trzpil, Fanny Pages, Diba Ayache, Roman Rousseau, Aurore Vicet, Michael Bahriz   +7 more
doaj   +1 more source

Mid-infrared Gas Sensing Using Graphene Plasmons Tuned by Reversible Chemical Doping [PDF]

, 2020
Highly confined plasmon modes in nanostructured graphene can be used to detect tiny quantities of biological and gas molecules. In biosensing, a specific biomarker can be concentrated close to graphene, where the optical field is enhanced, by using an ad-
Alani, Rose, Bareza, Nestor Jr., Gopalan, Kavitha K., Paulillo, Bruno, Pruneri, Valerio   +4 more
core   +3 more sources

Mid-Infrared Trace Gas Sensor Technology Based on Intracavity Quartz-Enhanced Photoacoustic Spectroscopy. [PDF]

Sensors (Basel), 2017
Wojtas J, Gluszek A, Hudzikowski A, Tittel FK.   +3 more
europepmc   +2 more sources

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

Performance of a azimuthally excited 3D-printed resonator for multi-pass spectroscopic applications [PDF]

, 2017
A design is presented for an acoustically resonant cell, based on the excitation of azimuthal resonances, to enhance the sensitivity of multi-pass photoacoustic spectroscopy.
Bauer, Ralf, Humphries, Gordon S., Lengden, Michael   +2 more
core   +1 more source

Quartz-enhanced photo-acoustic spectroscopy for breath analyses [PDF]

, 2017
peer ...
Feng, P, Focant, Jean-François, Lamard, L, Lassen, M, Peremans, A, Petersen, J   +5 more
core   +1 more source

Single-tube on-beam quartz-enhanced photoacoustic spectroscopy

Optics Letters, 2016
Quartz-enhanced photoacoustic spectroscopy (QEPAS) with a single-tube acoustic microresonator (AmR) inserted between the prongs of a custom quartz tuning fork (QTF) was developed, investigated, and optimized experimentally. Due to the high acoustic coupling efficiency between the AmR and the QTF, the single-tube on-beam QEPAS spectrophone configuration
Zheng, Huadan, Dong, Lei, Sampaolo, Angelo, Wu, Hongpeng, Patimisco, Pietro, Yin, Xukun, Ma, Weiguang, Zhang, Lei, Yin, Wangbao, SPAGNOLO, Vincenzo Luigi, Jia, Suotang, Tittel, Frank K.   +11 more
openaire   +5 more sources

Light intensity correction for quartz-enhanced photoacoustic spectroscopy using photothermal baseline

Frontiers in Physics, 2022
A convenient method of light intensity correction for quartz-enhanced photoacoustic spectroscopy (QEPAS) using photothermal baseline is demonstrated. The laser beam passes through the prongs of the quartz tuning fork (QTF) and then focused on the root of
Xiang Chen, Xiang Chen, Mai Hu, Mai Hu, Hao Liu, Hao Liu, Lu Yao, Zhenyu Xu, Ruifeng Kan   +8 more
doaj   +1 more source