Results 111 to 120 of about 3,337,551 (141)

Helmholtz-resonator quartz-enhanced photoacoustic spectroscopy

Optics Letters, 2023
In this work, Helmholtz-resonator quartz-enhanced photoacoustic spectroscopy (HR-QEPAS) was developed for trace gas sensing. A pair of Helmholtz resonators with high-order resonance frequency was designed and coupled with a quartz tuning fork (QTF).
Huijian Luo, Chenglong Wang, Haoyang Lin, Qian Wu, Zhifei Yang, Wenguo Zhu, Yongchun Zhong, Ruifeng Kan, Jianhui Yu, Huadan Zheng   +9 more
openaire   +2 more sources

Differential quartz-enhanced photoacoustic spectroscopy

Applied Physics Letters, 2023
In this paper, a differential quartz-enhanced photoacoustic spectroscopy (D-QEPAS) sensor is reported. The differential photoacoustic cell (PAC) was used to generate the photoacoustic effect. Two quartz tuning forks (QTFs) with a quality factor (Q) up to 10 000 were used as the acoustic wave transducers. The signal of D-QEPAS sensor was doubly enhanced
Chu Zhang, Shunda Qiao, Ying He, Sheng Zhou, Lei Qi, Yufei Ma   +5 more
openaire   +1 more source

Quartz-enhanced photoacoustic spectroscopy for multi-gas detection: A review

Analytica Chimica Acta, 2022
Multi-gas detection represents a suitable solution in many applications, such as environmental and atmospheric monitoring, chemical reaction and industrial process control, safety and security, oil&gas and biomedicine. Among optical techniques, Quartz-Enhanced Photoacoustic Spectroscopy (QEPAS) has been demonstrated to be a leading-edge technology for ...
Lei Dong, Spagnolo Vincenzo, Pietro Patimisco   +2 more
exaly   +4 more sources

Optimization of spectrophone performance for quartz-enhanced photoacoustic spectroscopy

Sensors and Actuators B: Chemical, 2012
We numerically investigate the effects of spectrophone parameters, including the operating acoustic frequency, the relative position of the quartz tuning fork and the excitation laser beam, the gap between the resonant tubes and the tuning fork, and the ...
Hoi Lut Ho, Yingchun Cao
exaly   +2 more sources

Quartz-Enhanced Photoacoustic Spectroscopy-Conductance Spectroscopy for Gas Mixture Analysis

Analytical Chemistry, 2023
A novel spectroscopic method, named quartz-enhanced photoacoustic spectroscopy-conductance spectroscopy (QEPAS-CS), was first developed for gas mixture analysis. In QEPAS-CS, the advantage of photoacoustic detection and conductance analysis was realized by a quartz tuning fork (QTF).
Ruobin Zhuang, Leqing Lin, Chenglong Wang, Haoyang Lin, Huijian Luo, Haohua Lv, Wenguo Zhu, Yongchun Zhong, Bin Liu, Ruifeng Kan, Jianhui Yu, Huadan Zheng   +11 more
openaire   +2 more sources

Off-beam quartz-enhanced photoacoustic spectroscopy

Optics Letters, 2009
An off-beam (OB) detection approach is suggested and experimentally investigated and optimized for quartz-enhanced photoacoustic spectroscopy (QEPAS). This OB-QEPAS configuration, very simple in assembly, not only allows for use of larger excitation optical beams and facilitating optical alignment but also provides higher enhancement of photoacoustic ...
Kun, Liu, Xiaoyong, Guo, Hongming, Yi, Weidong, Chen, Weijun, Zhang, Xiaoming, Gao   +5 more
openaire   +2 more sources

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 ...
Shunda Qiao, Ziting Lang
exaly   +3 more sources

Quartz-enhanced photoacoustic spectroscopy of methane isotopologues

Photonic Instrumentation Engineering VIII, 2021
We report on the detection of the isotopologues 12CH4 and 13CH4 by employing a quartz-enhanced photoacoustic spectroscopy (QEPAS)-based sensor. By properly selecting the exciting light source and the working conditions, two absorption lines, having a negligible cross-section ratio temperature coefficient of -6.7‰/°C and a cross section ratio of ~ 0.06 ...
Marilena Giglio, Angelo Sampaolo, Pietro Patimisco, Davide Pinto, Giansergio Menduni, Arianna Elefante, Stefano Dello Russo, Fabrizio Sgobba, Andrea Zifarelli, Frank K. Tittel, Vincenzo Spagnolo   +10 more
openaire   +1 more source

Non-contact quartz-enhanced photoacoustic spectroscopy

Applied Physics Letters, 2023
Non-contact quartz-enhanced photoacoustic spectroscopy (NC-QEPAS) was proposed and developed for trace gas analysis. The NC-QEPAS aims at solving the problem that the quartz tuning fork (QTF) must be immersed in the gases for photoacoustic wave transducing, which limits its application for corrosive and dusty gas sensing.
Haoyang Lin, Chenglong Wang, Leqing Lin, Minshuai Wang, Wenguo Zhu, Yongchun Zhong, Jianhui Yu, Frank Tittel, Huadan Zheng   +8 more
openaire   +1 more source

Double acoustic microresonator quartz-enhanced photoacoustic spectroscopy

Optics Letters, 2014
Quartz-enhanced photoacoustic spectroscopy (QEPAS) based on double acoustic microresonators (AmRs) is developed and experimentally investigated. The double AmR spectrophone configuration exhibits a strong acoustic coupling between the AmR and the quartz tuning fork, which results in a ∼5  ms fast response time.
Lei, Dong, Hongpeng, Wu, Huadan, Zheng, Yanyan, Liu, Xiaoli, Liu, Wenzhe, Jiang, Lei, Zhang, Weiguang, Ma, Wei, Ren, Wangbao, Yin, Suotang, Jia, Frank K, Tittel   +11 more
openaire   +2 more sources