Results 101 to 110 of about 3,338,318 (170)

Planar Laser-Based QEPAS Trace Gas Sensor

Sensors, 2016
A novel quartz enhanced photoacoustic spectroscopy (QEPAS) trace gas detection scheme is reported in this paper. A cylindrical lens was employed for near-infrared laser focusing.
Yufei Ma, Ying He, Cheng Chen, Xin Yu, Jingbo Zhang, Jiangbo Peng, Rui Sun, Frank K. Tittel   +7 more
doaj   +1 more source

Recent advances in quartz-enhanced photoacoustic spectroscopy for environmental monitoring applications

, 2022
Quartz-Enhanced Photoacoustic Spectroscopy (QEPAS) has become a gas sensing leading-edge technology thanks to multi-species detection, modularity, ruggedness, portability, and real time operation.
Sampaolo A., Patimisco P., Menduni G., Giglio M., Zifarelli A., Di Gioia M., Spagnolo V., De Palo R.   +7 more
core  

Photothermal detection of trace compounds in water, using the deflection of a water meniscus [PDF]

, 1998
A novel photothermal detector is described, based on a closed cell suitable for use with low-frequency modulated continuous-wave light sources. Photothermal expansion in aqueous samples caused the deflection of a water meniscus held across a 200μℳ radius
Johnson, Mark, Hodgkinson, Jane, Dakin, John P.   +2 more
core   +1 more source

Breath analysis by quartz enhanced photoacoustic spectroscopy: A clinical study

International audienceA new silicon based capacitive sensor is developed for photoacoustic gas detection. It is precisely designed to overcome damping losses and enhance signal-to-noise ratio.
Seoudi, T, PAGES, F, BENABBAD, O, Charensol, J, Bahriz, M, Gouzi, Fares, Ayache, D, Vicet, Aurore, Molinari, Nicolas   +8 more
core   +1 more source

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

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

Quartz-enhanced photoacoustic spectroscopy for hydrocarbon trace gas detection and petroleum exploration

, 2020
Quartz-enhanced photoacoustic spectroscopy represents a valuable candidate for natural gas analysis in the oil & gas field. The core element of this spectroscopy technique is a quartz tuning forks, employed as high quality-factor optoacoustic ...
Sampaolo A., Dong L., Patimisco P., Tittel F. K., Wu H., Menduni G., Giglio M., Spagnolo V., Passaro V. M. N.   +8 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