Results 91 to 100 of about 218 (120)

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
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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. The clamp-type QTF provides a wavefront-shaped aperture with a diameter up to 1 mm, while keeping Q factors >
Qian Wu, Haohua Lv, Leqing Lin, Hongpeng Wu, Marilena Giglio, Wenguo Zhu, Yongchun Zhong, Angelo Sampaolo, Pietro Patimisco, Lei Dong, Vincenzo Spagnolo, Jianhui Yu, Huadan Zheng   +12 more
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Comparison of Quartz-enhanced Photoacoustic Spectroscopy and Conventional Photoacoustic Spectroscopy based Detectors

Lasers, Sources and Related Photonic Devices, 2010
Performance of quartz-enhanced photoacoustic spectroscopy and conventional photoacoustic spectroscopy based detectors applied to trace gas sensing was compared. Nitrogen with 10 ppmv of acetylene and a diode laser accessing 6529.17 cm−1 absorption line were used.
Lei Dong, Rafal Lewicki, Frank K. Tittel, Anatoliy A. Kosterev   +3 more
openaire   +1 more source

Off-plane quartz-enhanced photoacoustic spectroscopy

Optics Letters
In this work, we developed off-plane quartz-enhanced photoacoustic spectroscopy (OP-QEPAS). In the OP-QEPAS the light beam went neither through the prong spacing of the quartz tuning fork (QTF) nor in the QTF plane. The light beam is in parallel with the QTF with an optimal distance, resulting in low background noise. A radial-cavity (RC) resonator was
Huijian Luo, Junming Li, Haohua Lv, Jiabao Xie, Chenglong Wang, Haoyang Lin, Ruobin Zhuang, Wenguo Zhu, Yongchun Zhong, Ruifeng Kan, Jianhui Yu, Huadan Zheng   +11 more
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Quartz enhanced photoacoustic spectroscopy for the detection of acetone

Sixth International Conference on Optical and Photonic Engineering (icOPEN 2018), 2018
Quartz enhanced photoacoustic spectroscopy (QEPAS) is an extremely effective tool for the detection and quantification of trace gases, which offers advantages of fast response, high sensitivity and high resolution. In this paper, a gas sensor based on quartz-enhanced photoacoustic detection and an external cavity quantum cascade laser (ECQCL) was ...
Jinsong Li, Tianbo He, Sheng Zhou, Weikai Hu   +3 more
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Quartz Enhanced Photoacoustic Spectroscopy: Today and Beyond

Lasers, Sources and Related Photonic Devices, 2010
Current theoretical understanding and practical applications of the trace gas sensing technique called quartz enhanced photoacoustic spectroscopy (QEPAS) will be presented. Work in progress and planned QEPAS developments will be discussed.
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Theoretical analysis of a quartz-enhanced photoacoustic spectroscopy sensor

Applied Physics B, 2009
Quartz-enhanced photoacoustic spectroscopy (QEPAS) sensors are based on a recent approach to photoa- coustic detection which employs a quartz tuning fork as an acoustic transducer. These sensors enable detection of trace gases for air quality monitoring, industrial process control, and medical diagnostics.
N. Petra, J. Zweck, A. A. Kosterev, S. E. Minkoff, D. Thomazy   +4 more
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New developments in THz quartz enhanced photoacoustic spectroscopy

SPIE Proceedings, 2016
We will report on new developments of quartz-enhanced photo-acoustic (QEPAS) sensor employing THz quantum cascade laser (QCLs). The extension of the QEPAS technique in the THz range was made possible by the realization of custom made QTFs. With the aim to improve the QTF acousto-electric transduction efficiency, we designed and realized new QTF designs.
Spagnolo V, Patimisco P, Sampaolo A, Giglio M, Vitiello MS, Scamarcio G, Tittel FK   +6 more
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Quartz Enhanced Photoacoustic Spectroscopy for Human Breath Analysis

Frontiers in Optics 2016, 2016
Simultaneous monitoring of several trace gases requires source tunability and highly sensitive detection. To serve this purpose a MIR-OPO light source pumping a quartz-enhanced photoacoustic sensor is demonstrated. The sensor targets exhaled human breath analysis.
M. Lassen, L. Lamard, Y. Feng, A. Peremans, J. C. Petersen   +4 more
openaire   +1 more source

Double resonant quartz-enhanced photoacoustic spectroscopy with a spherical resonator

Optics Letters
In this Letter, double resonant quartz-enhanced photoacoustic spectroscopy (QEPAS) with a spherical resonator is proposed for the first time to our knowledge. This spherical resonator, which functions both as an acoustic resonator and a gas chamber, facilitates efficient sound wave coupling between the resonator and the quartz tuning fork (QTF ...
Chu Zhang, Shunda Qiao, Ying He, Yufei Ma   +3 more
openaire   +2 more sources