Results 101 to 110 of about 3,337,551 (141)

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 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

Effect of gas turbulence in quartz-enhanced photoacoustic spectroscopy: A comprehensive flow field analysis

Photoacoustics
Here we present a computational and experimental fluid dynamics study for the characterization of the flow field within the gas chamber of a Quartz-Enhanced Photoacoustic Spectroscopy (QEPAS) sensor, at different flow rates at the inlet of the chamber ...
Andrea Zifarelli, Giuseppe Negro, Lavinia A. Mongelli, Angelo Sampaolo, Ezio Ranieri, Lei Dong, Hongpeng Wu, Pietro Patimisco, Giuseppe Gonnella, Vincenzo Spagnolo   +9 more
doaj   +1 more source

Ultra-highly sensitive dual gases detection based on photoacoustic spectroscopy by exploiting a long-wave, high-power, wide-tunable, single-longitudinal-mode solid-state laser

Light: Science & Applications
Photoacoustic spectroscopy (PAS) as a highly sensitive and selective trace gas detection technique has extremely broad application in many fields. However, the laser sources currently used in PAS limit the sensing performance. Compared to diode laser and
Shunda Qiao, Ying He, Haiyue Sun, Pietro Patimisco, Angelo Sampaolo, Vincenzo Spagnolo, Yufei Ma   +6 more
doaj   +1 more source

Evanescent wave quartz-enhanced photoacoustic spectroscopy employing dielectric coated side-polished fibers for sensing applications

We present an all-fiber laser gas analyzer using quartz-enhanced photoacoustic spectroscopy, featuring a dielectric-coated side-polished fiber, custom quartz tuning fork, and acoustic micro-resonators, achieving over 42 times enhancement in QEPAS signal ...
Twomey, Cian F., Ruth, Albert A., Walsh, Anton, Di Falco, Andrea, O'Faolain, Liam, Ali, Farhan, Biagi, Gabriele   +6 more
core  

Elliptical acoustic resonator-enabled synchronous acoustic excitation by multiple laser beams in quartz-enhanced photoacoustic spectroscopy

We report synchronous excitation of an acoustic mode in quartz-enhanced photoacoustic spectroscopy (QEPAS) enabled by an elliptical acoustic resonator under multi-beam illumination. In this configuration, multiple laser beams distributed within the prong
Han, Wenfei, Li, Xinran, Dong, Lei, Wang, Zimu, Ren, Yingzhang, Cui, Ruyue, Li, Chunxia, Xu, Jiale, Spagnolo, Vincenzo, Chen, Weidong, Wu, Hongpeng   +10 more
core   +1 more source

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Radial-cavity quartz-enhanced photoacoustic spectroscopy

Optics Letters, 2021
Radial-cavity quartz-enhanced photoacoustic spectroscopy (RC-QEPAS) was proposed for trace gas analysis. A radial cavity with (0,0,1) resonance mode was coupled with the quartz tuning fork (QTF) to greatly enhance the QEPAS signal and facilitate the optical alignment.
Haohua Lv, Huadan Zheng, Yihua Liu, Zhifei Yang, Qian Wu, Haoyang Lin, Baiyang Antonio Zhou Montano, Wenguo Zhu, Jianhui Yu, Ruifeng Kan, Zhe Chen, Frank K. Tittel   +11 more
openaire   +2 more sources

Improved Tuning Fork for Terahertz Quartz-Enhanced Photoacoustic Spectroscopy [PDF]

Sensors, 2016
We report on a quartz-enhanced photoacoustic (QEPAS) sensor for methanol (CH3OH) detection employing a novel quartz tuning fork (QTF), specifically designed to enhance the QEPAS sensing performance in the terahertz (THz) spectral range. A discussion of the QTF properties in terms of resonance frequency, quality factor and acousto-electric transduction ...
Harvey Beere, Spagnolo Vincenzo, Miriam Serena Vitiello   +2 more
exaly   +5 more sources