Results 21 to 30 of about 3,337,551 (141)

Extensions of quartz-enhanced photoacoustic spectroscopy [PDF]

, 2009
Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Physics, 2009.Includes bibliographical references (p. 57-58).The goal of this thesis was to perform quartz-enhanced photoacoustic spectroscopy (QEPAS) on trace concentrations of NH3 in the 1 ...
Masurkar, Amrita V
core   +2 more sources

Clamp-type quartz tuning fork enhanced photoacoustic spectroscopy

Optics Letters, 2022
In this Letter, clamp-type quartz tuning fork enhanced photoacoustic spectroscopy (Clamp-type QEPAS) is proposed and realized through the design, realization, and testing of clamp-type quartz tuning forks (QTFs) for photoacoustic gas sensing.
Yu, Jianhui, Zheng, Huadan, Zhong, Yongchun, Jianhui Yu, Wu, Hongpeng, Sampaolo, Angelo, Lin, Leqing, Qian Wu, Vincenzo Spagnolo, Patimisco, Pietro, Marilena Giglio, Wenguo Zhu, Dong, Lei, Huadan Zheng, Lv, Haohua, Yongchun Zhong, Wu, Qian, Leqing Lin, Hongpeng Wu, Lei Dong, Zhu, Wenguo, Pietro Patimisco, Haohua Lv, Giglio, Marilena, Spagnolo, Vincenzo, Angelo Sampaolo   +25 more
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Spatially engineered optical–acoustic matching in quartz-enhanced photoacoustic spectroscopy

Photoacoustics
Quartz-enhanced photoacoustic spectroscopy (QEPAS) offers high sensitivity for trace-gas detection, but its performance is often limited by a spatial mismatch between distributed photoacoustic excitation and the intrinsic sensitivity region of the quartz
Ruyue Cui, Wenfei Han, Chenglong Wang, Chunxia Li, Yingzhang Ren, Xinran Li, Jiale Xu, Vincenzo Spagnolo, Weidong Chen, Hongpeng Wu, Lei Dong   +10 more
doaj   +2 more sources

Quartz-Enhanced Photoacoustic Spectroscopy Sensor with a Small-Gap Quartz Tuning Fork [PDF]

Sensors, 2018
A highly sensitive quartz-enhanced photoacoustic spectroscopy (QEPAS) sensor based on a custom quartz tuning fork (QTF) with a small-gap of 200 μm was demonstrated.
Yu-Fei Ma, Yao Tong, Ying He, Jin-Hu Long, Xin Yu   +4 more
doaj   +3 more sources

Breath Isoprene Sensor Based on Quartz-Enhanced Photoacoustic Spectroscopy

Sensors
Isoprene, the most abundant endogenous hydrocarbon in human breath, is a promising biomarker for metabolic and cardiovascular diseases. In this paper, we present the detection of isoprene in exhaled breath using the off-beam Quartz-Enhanced Photoacoustic
Fadia Abou Naoum, Diba Ayache, Tarek Seoudi, Daniel Andres Diaz-Thomas, Alexei Baranov, Fanny Pages, Julien Charensol, Eric Rosenkrantz, Meryem Aouadi, Michael Bahriz, Fares Gouzi, Aurore Vicet   +11 more
doaj   +3 more sources

Multivariate spectral analysis in quartz-enhanced photoacoustic spectroscopy

Quantum Sensing and Nano Electronics and Photonics XIX, 2023
Here we report on the application of multivariate analysis on optical sensors for gas detection based on Quartz-Enhanced Photoacoustic Spectroscopy (QEPAS) technique, focused on the analysis of complex gas mixtures. In real-world applications the effects
Aldo Francesco Pio Cantatore, Giansergio Menduni, Andrea Zifarelli, Christine Hölzl, Vincenzo Spagnolo, Pietro Patimisco   +5 more
core   +2 more sources

Quartz-enhanced photoacoustic spectroscopy for gas sensing applications

, 2020
This chapter aims to introduce quartz-enhanced photoacoustic spectroscopy (QEPAS) for trace gas sensing. Starting from the basic physical principles, the QEPAS technique is described.
Tittel, Frank K., Vincenzo Spagnolo, Frank K. Tittel, Spagnolo, Vincenzo, Patimisco, Pietro, Pietro Patimisco   +5 more
core   +2 more sources

Quartz-enhanced photoacoustic spectroscopy [PDF]

Optics Letters, 2002
A new approach to detecting a weak photoacoustic signal in a gas medium is described. Instead of a gas-filled resonant acoustic cavity, the sound energy is accumulated in a high- Q crystal element. Feasibility experiments utilizing a quartz-watch tuning fork demonstrate a sensitivity of 1.2x10(-7) cm(-1) W/ radicalHz .
A A, Kosterev, Yu A, Bakhirkin, R F, Curl, F K, Tittel   +3 more
openaire   +2 more sources

Recent Advances in QEPAS and QEPTS Based Trace Gas Sensing: A Review

Frontiers in Physics, 2020
This invited review paper summarizes and discusses developments of QTF based state-of-the-art quartz-enhanced photoacoustic spectroscopy (QEPAS) and quartz-enhanced photothermal spectroscopy (QEPTS) gas sensing techniques over the past 3 years.
Yufei Ma
doaj   +1 more source

Highly Sensitive Trace Gas Detection Based on In-Plane Single-Quartz-Enhanced Dual Spectroscopy

Sensors, 2022
For this invited manuscript, an in-plane single-quartz-enhanced dual spectroscopy (IP-SQEDS)-based trace gas sensor was demonstrated for the first time.
Tiantian Liang, Shunda Qiao, Ziting Lang, Yufei Ma   +3 more
doaj   +1 more source