Results 21 to 30 of about 3,994 (183)

Quartz-enhanced photoacoustic-photothermal spectroscopy for trace gas sensing

Optics Express, 2021
A trace gas detection technique of quartz-enhanced photoacoustic-photothermal spectroscopy (QEPA-PTS) is demonstrated. Different from quartz-enhanced photoacoustic spectroscopy (QEPAS) or quartz-enhanced photothermal spectroscopy (QEPTS), which detected only one single kind of signal, QEPA-PTS was realized by adding the photoacoustic and photothermal ...
Yinqiu Hu, Shunda Qiao, Ying He, Ziting Lang, Yufei Ma   +4 more
openaire   +4 more sources

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

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   +2 more sources

Folded-optics-based quartz-enhanced photoacoustic and photothermal hybrid spectroscopy

Photoacoustics
Folded-optics-based quartz-enhanced photoacoustic and photothermal hybrid spectroscopy (FO-QEPA-PTS) is reported for the first time. In FO-QEPA-PTS, the detection of the photoacoustic and photothermal hybrid signal is achieved through the use of a custom
Ruyue Cui, Hongpeng Wu, Frank K. Tittel, Vincenzo Spagnolo, Weidong Chen, Lei Dong   +5 more
doaj   +3 more sources

Quartz Enhanced Photoacoustic Spectroscopy Based Trace Gas Sensors Using Different Quartz Tuning Forks [PDF]

Sensors, 2015
A sensitive trace gas sensor platform based on quartz-enhanced photoacoustic spectroscopy (QEPAS) is reported. A 1.395 μm continuous wave (CW), distributed feedback pigtailed diode laser was used as the excitation source and H2O was selected as the ...
Yufei Ma, Guang Yu, Jingbo Zhang, Xin Yu, Rui Sun, Frank K. Tittel   +5 more
doaj   +2 more sources

A High Sensitivity Preamplifier for Quartz Tuning Forks in QEPAS (Quartz Enhanced PhotoAcoustic Spectroscopy) Applications [PDF]

Sensors, 2017
All the preamplifiers dedicated for Quartz Enhanced PhotoAcoustic Spectroscopy (QEPAS) applications that have so far been reported in the literature have been based on operational amplifiers working in transimpedance configurations.
Tomasz Starecki, Piotr Z. Wieczorek
doaj   +2 more sources

Quartz-enhanced photoacoustic spectroscopy exploiting low-frequency tuning forks as a tool to measure the vibrational relaxation rate in gas species. [PDF]

Photoacoustics, 2021
Dello Russo S, Sampaolo A, Patimisco P, Menduni G, Giglio M, Hoelzl C, Passaro VMN, Wu H, Dong L, Spagnolo V.   +9 more
europepmc   +2 more sources

Compact and portable quartz-enhanced photoacoustic spectroscopy sensor for carbon monoxide environmental monitoring in urban areas. [PDF]

Photoacoustics, 2022
Sgobba F, Sampaolo A, Patimisco P, Giglio M, Menduni G, Ranieri AC, Hoelzl C, Rossmadl H, Brehm C, Mackowiak V, Assante D, Ranieri E, Spagnolo V.   +12 more
europepmc   +2 more sources

Quartz-enhanced laser spectroscopy sensing [PDF]

Light: Science & Applications
Gas sensing technology is widely applied in various fields, including environmental monitoring, industrial process control, medical diagnostics, safety warnings, and more.
Shunda Qiao, Xiaonan Liu, Ziting Lang, Ying He, Weidong Chen, Yufei Ma   +5 more
doaj   +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