Results 81 to 90 of about 825 (180)

Front-End Amplifiers for Tuning Forks in Quartz Enhanced PhotoAcoustic Spectroscopy

Applied Sciences, 2020
A study of the front-end electronics for quartz tuning forks (QTFs) employed as optoacoustic transducers in quartz-enhanced photoacoustic spectroscopy (QEPAS) sensing is reported.
Giansergio Menduni, Angelo Sampaolo, Pietro Patimisco, Marilena Giglio, Stefano Dello Russo, Andrea Zifarelli, Arianna Elefante, Piotr Z. Wieczorek, Tomasz Starecki, Vittorio M. N. Passaro, Frank K. Tittel, Vincenzo Spagnolo   +11 more
doaj   +1 more source

The Abundance of Plasmid‐Mediated Quinolone Resistance Genes in Enterobacter cloacae Strains Isolated from Clinical Specimens in Kermanshah, Iran

Canadian Journal of Infectious Diseases and Medical Microbiology, Volume 2024, Issue 1, 2024.
Background. Enterobacter cloacae (E. cloacae) is one of the most common Enterobacteriaceae causing nosocomial infections. Plasmid‐mediated quinolone resistance (PMQR) determinants have been considered recently. This study evaluated the abundance of PMQR genes in strains of E. cloacae obtained from clinical samples in Kermanshah, Iran. Methods.
Mandana Afsharian, Somayeh Asadi, Camellia Danesh, Reza Sedighi, Kohsar Karimi, Nooshin Miladi, Ronak Miladi, Mohsen Azizi, Nahid Madadi-Goli, Kamal Ahmadi, Mohammad Hossein Zamanian, Mohsin Khurshid   +11 more
wiley   +1 more source

Fiber-Coupled Quartz-Enhanced Photoacoustic Spectroscopy System for Methane and Ethane Monitoring in the Near-Infrared Spectral Range

Molecules, 2020
We report on a fiber-coupled, quartz-enhanced photoacoustic spectroscopy (QEPAS) near-IR sensor for sequential detection of methane (CH4 or C1) and ethane (C2H6 or C2) in air.
Giansergio Menduni, Fabrizio Sgobba, Stefano Dello Russo, Ada Cristina Ranieri, Angelo Sampaolo, Pietro Patimisco, Marilena Giglio, Vittorio M.N. Passaro, Sebastian Csutak, Dario Assante, Ezio Ranieri, Eric Geoffrion, Vincenzo Spagnolo   +12 more
doaj   +1 more source

Capteurs QEPAS pour la surveillance de la qualité de l'air

, 2020
Human activities, at a personal and at an industrial level, cause the release of numerous molecular species in the atmosphere. Even a very low level of certain molecules can lead to the alteration of the air quality.
Rousseau, Roman
core  

Compact QEPAS sensor for trace methane and ammonia detection in impure hydrogen [PDF]

, 2011
A compact two-gas sensor based on quartz enhanced photoacoustic spectroscopy (QEPAS) was developed for trace methane and ammonia quantification in impure hydrogen.
Peters, B., Wright, J., Ferguson, B., Mcwhorter, S.   +3 more
core  

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

, 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.
Sampaolo A., Yin W., Yin X., Zhang L., Jia S., Ma W., Pei K., Dong L., Patimisco P., Tittel F. K., Wu H., Xiao L., Spagnolo V., Zheng H.   +13 more
core   +2 more sources

QEPAS Sensor Based on the Tracking of the Photoacoustic Induced Frequency Shift of a Tuning Fork Maintained in Self-Sustained Oscillation by Electrical Excitation

, 2021
International audienceOscillator frequency shift induced by the photoacoustic force on a closed-loop electrically excited quartz tuning fork is exploited to carry out QEPAS measurement. We report recent improvements of this new method for background-free
Raybaut, Myriam, R. Lévy, Aoust, Guillaume, Duquesnoy, Maxime, J-M. Melkonian, Lévy, Raphaël, Godard, Antoine, G. Aoust, A. Godard, Melkonian, Jean-Michel, M. Raybaut, M. Duquesnoy   +11 more
core   +1 more source

Broadband Gas QEPAS Detection Exploiting a Monolithic DFB-QCL Array

, 2021
Mid-infrared spectral “fingerprints” of many hazardous and harmful gaseous substances are characterized by broad absorption bands, resulting from the merging of several absorption lines corresponding to ro-vibrational transitions.
Arianna Elefante, Marilena Giglio, Christian Pfluegl, Romain Blanchard, Mark F. Witinski, Giansergio Menduni, Andrea Zifarelli, Frank K. Tittel, Vincenzo Spagnolo, Angelo Sampaolo, Pietro Patimisco, Daryoosh Vakhshoori   +11 more
core   +1 more source

A Mid-infrared QEPAS sensor device for TATP detection

Journal of Physics: Conference Series, 2009
Recent developments of external cavity quantum cascade lasers (EC-QC lasers) enable new applications in laser spectroscopy of trace gas species in the mid-infrared spectral region. We report the application of quartz enhanced photo acoustic spectroscopy (QEPAS) with widely tuneable EC-QC lasers as excitation sources for chemical sensing of different ...
C Bauer, U Willer, R Lewicki, A Pohlkötter, A Kosterev, D Kosynkin, F K Tittel, W Schade   +7 more
openaire   +1 more source

QEPAS based ppb-level detection of CO and N2O using a high power CW DFB-QCL

, 2013
An ultra-sensitive and selective quartz-enhanced photoacoustic spectroscopy (QEPAS) sensor platform was demonstrated for detection of carbon monoxide (CO) and nitrous oxide (N2O). This sensor used a stateof- the art 4.61 μm high power, continuous wave
Razeghi, Manijeh, Ma, Yufei, Tittel, Frank K., Lewicki, Rafał   +3 more
core   +1 more source