Results 41 to 50 of about 3,545,515 (169)

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

Extensions of quartz-enhanced photoacoustic spectroscopy [PDF]

, 2009
The goal of this thesis was to perform quartz-enhanced photoacoustic spectroscopy (QEPAS) on trace concentrations of NH3 in the 1.53 pm region with a DFB laser without the use of a resonating cavity. I analyzed the process of QEPAS both analytically and experimentally.
Masurkar, Amrita V
openaire   +2 more sources

Quartz-enhanced photoacoustic spectroscopy

, 2007
Methods and apparatus for detecting photoacoustic signals in fluid media are described. The present invention differs from conventional photoacoustic spectroscopy in that rather than accumulating the absorbed energy in the fluid of a sample cell, the ...
Kosterev, Anatoliy A.
openaire   +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

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
Andrea Zifarelli, Giansergio Menduni, Aldo F. P. Cantatore, Pietro Patimisco, Christine Holzl, Vincenzo Spagnolo   +5 more
openaire   +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

Impact of Humidity on Quartz-Enhanced Photoacoustic Spectroscopy Based CO Detection Using a Near-IR Telecommunication Diode Laser. [PDF]

Sensors (Basel), 2016
Yin X, Dong L, Zheng H, Liu X, Wu H, Yang Y, Ma W, Zhang L, Yin W, Xiao L, Jia S.   +10 more
europepmc   +2 more sources

Supplementary document for Helmholtz-resonator quartz-enhanced photoacoustic spectroscopy - 6293880.pdf

, 2023
Helmholtz-resonator quartz-enhanced photoacoustic ...
Zhifei Yang (14613332), Qian Wu (209382), Chenglong Wang (4385533), Yongchun Zhong (2293609), Haoyang Lin (14613329), Huadan Zheng (6504797), Huijian Luo (14613326), Wenguo Zhu (3955415), JianHui Yu (4528867), Ruifeng Kan (6611132)   +9 more
core   +1 more source

Application of standard and custom quartz tuning forks for quartz-enhanced photoacoustic spectroscopy gas sensing

, 2022
A review on the design of quartz tuning forks and their applications in quartz-enhanced photoacoustic spectroscopy (QEPAS)-based trace gas sensors is reported. Standard commercial quartz tuning forks are used as sound wave transducers in the conventional
Yu, Jianhui, Zheng, Huadan, Zhong, Yongchun, Jianhui Yu, Sampaolo, Angelo, Lin, Leqing, Liu, Yihua, Vincenzo Spagnolo, Patimisco, Pietro, Marilena Giglio, Wenguo Zhu, Zhou, Xu, Haoyang Lin, Huadan Zheng, Yihua Liu, Yongchun Zhong, Frank K. Tittel, Leqing Lin, Zhu, Wenguo, Pietro Patimisco, Xu Zhou, Lin, Haoyang, Tittel, Frank K., Giglio, Marilena, Spagnolo, Vincenzo, Angelo Sampaolo   +25 more
core   +1 more source