Results 31 to 40 of about 3,994 (183)

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

Integrated near-infrared QEPAS sensor based on a 28 kHz quartz tuning fork for online monitoring of CO2 in the greenhouse

Photoacoustics, 2022
In this paper, a highly sensitive and integrated near-infrared CO2 sensor was developed based on quartz-enhanced photoacoustic spectroscopy (QEPAS).
Yihua Liu, Haoyang Lin, Baiyang Antonio Zhou Montano, Wenguo Zhu, Yongchun Zhong, Ruifeng Kan, Bin Yuan, Jianhui Yu, Min Shao, Huadan Zheng   +9 more
doaj   +1 more source

Improved Tuning Fork for Terahertz Quartz-Enhanced Photoacoustic Spectroscopy. [PDF]

Sensors (Basel), 2016
We report on a quartz-enhanced photoacoustic (QEPAS) sensor for methanol (CH3OH) detection employing a novel quartz tuning fork (QTF), specifically designed to enhance the QEPAS sensing performance in the terahertz (THz) spectral range. A discussion of the QTF properties in terms of resonance frequency, quality factor and acousto-electric transduction ...
Sampaolo A, Patimisco P, Giglio M, Vitiello MS, Beere HE, Ritchie DA, Scamarcio G, Tittel FK, Spagnolo V.   +8 more
europepmc   +6 more sources

Dual-frequency modulated heterodyne quartz-enhanced photoacoustic spectroscopy

Optics Express, 2023
A novel dual-frequency modulated heterodyne quartz-enhanced photoacoustic spectroscopy (DFH-QEPAS) was demonstrated for what we believe to be the first time in this study. In traditional H-QEPAS, the frequency of modulated sinusoidal wave has a frequency difference (Δf) with the resonance frequency (f0) of a quartz tuning fork (QTF).
Ziting Lang, Shunda Qiao, Tiantian Liang, Ying He, Lei Qi, Yufei Ma   +5 more
openaire   +2 more sources

Simultaneous Detection of Gas Concentration and Light Intensity Based on Dual-Quartz-Enhanced Photoacoustic-Photothermal Spectroscopy

Photonics, 2023
This research proposes a method for the simultaneous acquisition of the second harmonic (2f) signal of quartz-enhanced photoacoustic spectroscopy (QEPAS) and the first harmonic (1f) signal of quartz-enhanced photothermal spectroscopy (QEPTS) based on the
Hao Liu, Xiang Chen, Lu Yao, Zhenyu Xu, Mai Hu, Ruifeng Kan   +5 more
doaj   +1 more source

Modeling thin-film piezoelectric polymer ultrasonic sensors [PDF]

, 2014
This paper presents a model suitable to design and characterize broadband thin film sensors based on piezoelectric polymers. The aim is to describe adequately the sensor behavior, with a reasonable number of parameters and based on well-known physical ...
Cardozo Santiago, Gustavo David, González, Martín Germán, Sorichetti, Patricio Aníbal   +2 more
core   +1 more source

Detection of Molecular Oxygen at Low Concentrations Using Quartz Enhanced Photoacoustic Spectroscopy

Sensors, 2010
Molecular oxygen is detected at low concentrations using photoacoustic spectroscopy despite its unfavorable photoacoustic properties. The system consists of a seed laser diode, a tapered amplifier and a quartz tuning fork based spectrophone, thus ...
Andreas Pohlkötter, Michael Köhring, Ulrike Willer, Wolfgang Schade   +3 more
doaj   +1 more source

Continuous wave optical parametric oscillator for quartz-enhanced photoacoustic trace gas sensing [PDF]

, 2007
A continuous wave optical parametric oscillator, generating up to 300 mW idler output in the 3–4 μm wavelength region, and pumped by a fiber-amplified DBR diode laser is used for trace gas detection by means of quartz-enhanced photoacoustic spectroscopy (
A. Henderson, A.A. Kosterev, A.A. Kosterev, A.A. Kosterev, A.K.Y. Ngai, A.K.Y. Ngai, A.K.Y. Ngai, C.J. Lee, F. Müller, F. Müller, F.J.M. Harren, F.K. Tittel, F.K. Tittel, G. Basum von, G. Berden, G. Wysocki, H. Verbraak, I.D. Lindsay, I.D. Lindsay, I.D. Lindsay, J.A. Silver, K.-J. Boller, L.S. Rothman, M.D. Wojcik, M.E. Klein, M.M.J.W. Herpen van, M.M.J.W. Herpen van, P. Groß, P.E. Powers, R. Lewicki, S.E. Bisson, S.M. Cristescu, S.T. Persijn, Y.Y. Liu   +33 more
core   +6 more sources

A measurement strategy for non-dispersive ultra-violet detection of formaldehyde in indoor air: Spectral analysis and interferent gases [PDF]

, 2015
We have conducted an extensive review of published spectra in order to identify a region with potential for detection of formaldehyde in indoor air.
Davenport, John, Hodgkinson, Jane, Saffell, John R., Tatam, Ralph P.   +3 more
core   +1 more source

Spider Silk-Improved Quartz-Enhanced Conductance Spectroscopy for Medical Mask Humidity Sensing

Molecules, 2022
Spider silk is one of the hottest biomaterials researched currently, due to its excellent mechanical properties. This work reports a novel humidity sensing platform based on a spider silk-modified quartz tuning fork (SSM-QTF). Since spider silk is a kind
Leqing Lin, Yu Zhong, Haoyang Lin, Chenglong Wang, Zhifei Yang, Qian Wu, Di Zhang, Wenguo Zhu, Yongchun Zhong, Yuwei Pan, Jianhui Yu, Huadan Zheng   +11 more
doaj   +1 more source