Results 111 to 120 of about 3,994 (183)

Harmonic phase-sensitive detection for quartz-enhanced photoacoustic-thermoelastic spectroscopy

Photoacoustics
Quartz tuning fork (QTF)-based techniques of photoacoustic spectroscopy and thermoelastic spectroscopy play a significant role in trace gas sensing due to unique high sensitivity and compactness.
Mengpeng Hu, Dongqing Zhang, Hui Zhang, Yu Liu, Weibiao Wang, Qiang Wang   +5 more
doaj   +1 more source

A Miniaturized QEPAS Trace Gas Sensor with a 3D-Printed Acoustic Detection Module

Sensors, 2017
A 3D printing technique was introduced to a quartz-enhanced photoacoustic spectroscopy (QEPAS) sensor and is reported for the first time. The acoustic detection module (ADM) was designed and fabricated using the 3D printing technique and the ADM volume ...
Xiaotao Yang, Youhong Xiao, Yufei Ma, Ying He, Frank K. Tittel   +4 more
doaj   +1 more source

Quartz-Enhanced Photoacoustic Spectroscopy Assisted by Partial Least-Squares Regression for Multi-Gas Measurements. [PDF]

Sensors (Basel), 2023
Rasmussen AN, Thomsen BL, Christensen JB, Petersen JC, Lassen M.   +4 more
europepmc   +1 more source

Détection par un diapason de quartz en spectroscopie d'absorption infra-rouge

, 2011
International audienceLes diapasons horlogers de quartz se sont avérés des détecteurs efficaces en spectroscopie IR, couplés à une détection synchrone.
Euphrasie, Sébastien, Hirtz, Patricia, Jalocha, Alain, Marthouret, Nadège, Moec, Samuel, Rincon Castillo, Boris Leonardo, Spajer, Michel, Vacheret, Xavier, Vairac, Pascal, Vernier, David   +9 more
core   +1 more source

Dual-Component Beat-Frequency Quartz-Enhanced Photoacoustic Spectroscopy Gas Detection System

Photonics
This study designed and validated a dual-component beat-frequency quartz-enhanced photoacoustic spectroscopy (BF-QEPAS) gas detection system utilizing time-division multiplexing (TDM).
Hangyu Xu, Yiwen Feng, Zihao Chen, Zhenzhao Zhuang, Jinbao Xia, Yiyang Zhao, Sasa Zhang   +6 more
doaj   +1 more source

A Miniaturized 3D-Printed Quartz-Enhanced Photoacoustic Spectroscopy Sensor for Methane Detection with a High-Power Diode Laser. [PDF]

Sensors (Basel), 2023
Chen Y, Liang T, Qiao S, Ma Y.
europepmc   +1 more source

Accessibility and enzymatic degradation of native and model cellulose substrates [PDF]

, 2011
This thesis investigated two issues relevant to the bioconversion of lignocellulosic biomass. The first part relates to the accessibility of cellulose in wood, more specifically, the impact of initial drying on wood ultrastructure.
Suchy, Miro
core  

Near-infrared laser photoacoustic detection of methane: the impact of molecular relaxation [PDF]

, 2018
A photoacoustic sensor has been developed for trace-gas monitoring using a near-infrared semiconductor laser emitting in the 2ν3 band of methane at 1.65μm. The apparatus was designed for on-line process control in the manufacturing of the novel low-water-
Besson, J.-P, Schilt, S., Thévenaz, L.
core  

Continuous real-time monitoring of carbon dioxide emitted from human skin by quartz-enhanced photoacoustic spectroscopy. [PDF]

Photoacoustics, 2023
Zhang Y, Xie Y, Lu J, Zhao J, Wu Y, Tong J, Shao J.   +6 more
europepmc   +1 more source

Quartz-enhanced photoacoustic spectroscopy (QEPAS) and Beat Frequency-QEPAS techniques for air pollutants detection: A comparison in terms of sensitivity and acquisition time. [PDF]

Photoacoustics, 2023
Li B, Menduni G, Giglio M, Patimisco P, Sampaolo A, Zifarelli A, Wu H, Wei T, Spagnolo V, Dong L.   +9 more
europepmc   +1 more source