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

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

Quartz tuning fork embedded off-beam quartz-enhanced photoacoustic spectroscopy

Optics Letters, 2019
In order to achieve a high acoustic coupling strength and detection sensitivity and to simplify the assembly and alignment process in quartz-enhanced photoacoustic spectroscopy (QEPAS) technique, a novel quartz tuning fork (QTF) embedded off-beam QEPAS (E-OB-QEPAS) spectrophone was proposed.
Lien Hu, Chuantao Zheng, Jie Zheng, Yiding Wang, Frank K. Tittel   +4 more
openaire   +2 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

Quartz enhanced photoacoustic H2S gas sensor based on a fiber-amplifier source and a custom tuning fork with large prong spacing [PDF]

, 2015
A quartz enhanced photoacoustic spectroscopy (QEPAS) sensor, employing an erbium-doped fiber amplified laser source and a custom quartz tuning fork (QTF) with its two prongs spaced ∼800 μm apart, is reported.
Dong, Lei, Jia, Suotang, Liu, Xiaoli, Ma, Weiguang, Patimisco, Pietro, Sampaolo, Angelo, Spagnolo, Vincenzo, Tittel, Frank K., Wu, Hongpeng, Yin, Wangbao, Yin, Xukun, Zhang, Lei, Zheng, Huadan   +12 more
core   +1 more source