Results 11 to 20 of about 218 (120)

Quartz-Enhanced Photoacoustic Spectroscopy in the Terahertz Spectral Range

Photonics, 2023
Infrared laser photo-acoustic spectroscopy provides very high sensitivity of a gas sample analysis when high-power tunable laser radiation sources and resonant photo-acoustic detectors (PADs) are used.
Alexey P. Votintsev, Alexey V. Borisov, Didar R. Makashev, Mariya Y. Stoyanova, Yury V. Kistenev   +4 more
doaj   +3 more sources

Quartz Enhanced Photoacoustic Spectroscopy on Solid Samples

Sensors
Quartz-Enhanced Photoacoustic Spectroscopy (QEPAS) is a technique in which the sound wave is detected by a quartz tuning fork (QTF). It enables particularly high specificity with respect to the excitation frequency and is well known for an ...
Judith Falkhofen, Marc-Simon Bahr, Bernd Baumann, Marcus Wolff   +3 more
doaj   +3 more sources

Quartz-enhanced multiheterodyne resonant photoacoustic spectroscopy

Light: Science & Applications
The extension of dual-comb spectroscopy (DCS) to all wavelengths of light along with its ability to provide ultra-large dynamic range and ultra-high spectral resolution, renders it extremely useful for a diverse array of applications in physics ...
Jiapeng Wang, Hongpeng Wu, Angelo Sampaolo, Pietro Patimisco, Vincenzo Spagnolo, Suotang Jia, Lei Dong   +6 more
doaj   +4 more sources

Quartz-Enhanced Photoacoustic Spectroscopy with Right-Angle Prism [PDF]

Sensors, 2016
A right-angle prism was used to enhance the acoustic signal of a quartz-enhanced photoacoustic spectroscopy (QEPAS) system. The incident laser beam was parallelly inverted by the right-angle prism and passed through the gap between two tuning fork prongs
Yongning Liu, Jun Chang, Jie Lian, Zhaojun Liu, Qiang Wang, Zengguang Qin   +5 more
doaj   +3 more sources

Quartz Enhanced Photoacoustic Spectroscopy Based on a Custom Quartz Tuning Fork [PDF]

Sensors, 2019
We have designed and fabricated a custom quartz tuning fork (QTF) with a reduced fundamental frequency; a larger gap between the prongs; and the best quality factor in air at atmospheric conditions ever reported, to our knowledge.
Maxime Duquesnoy, Guillaume Aoust, Jean-Michel Melkonian, Raphaël Lévy, Myriam Raybaut, Antoine Godard   +5 more
doaj   +3 more sources

Monolithic Double Resonator for Quartz Enhanced Photoacoustic Spectroscopy [PDF]

Applied Sciences, 2021
A new approach for Quartz Enhanced Photoacoustic Spectroscopy is presented, based on an acoustic excitation from the outside of the prongs of a quartz tuning fork, to increase the sensitivity of the sensor.
Roman Rousseau, Diba Ayache, Nicolas Maurin, Wioletta Trzpil, Michael Bahriz, Aurore Vicet   +5 more
doaj   +2 more sources

Quartz-Enhanced Photoacoustic Spectroscopy Sensor with a Small-Gap Quartz Tuning Fork [PDF]

Sensors, 2018
A highly sensitive quartz-enhanced photoacoustic spectroscopy (QEPAS) sensor based on a custom quartz tuning fork (QTF) with a small-gap of 200 μm was demonstrated.
Yu-Fei Ma, Yao Tong, Ying He, Jin-Hu Long, Xin Yu   +4 more
doaj   +3 more sources

Breath Isoprene Sensor Based on Quartz-Enhanced Photoacoustic Spectroscopy

Sensors
Isoprene, the most abundant endogenous hydrocarbon in human breath, is a promising biomarker for metabolic and cardiovascular diseases. In this paper, we present the detection of isoprene in exhaled breath using the off-beam Quartz-Enhanced Photoacoustic
Fadia Abou Naoum, Diba Ayache, Tarek Seoudi, Daniel Andres Diaz-Thomas, Alexei Baranov, Fanny Pages, Julien Charensol, Eric Rosenkrantz, Meryem Aouadi, Michael Bahriz, Fares Gouzi, Aurore Vicet   +11 more
doaj   +3 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

Multi-quartz-enhanced photoacoustic spectroscopy [PDF]

Applied Physics Letters, 2015
A multi-quartz-enhanced photoacoustic spectroscopy (M-QEPAS) sensor system for trace gas detection is reported. Instead of a single quartz tuning fork (QTF) as used in QEPAS technique, a dual QTF sensor platform was adopted in M-QEPAS to increase the signal strength by the addition of the detected QEPAS signals.
Ma, Yufei, Yu, Xin, Yu, Guang, Li, Xudong, Zhang, Jingbo, Chen, Deying, Sun, Rui, Tittel, Frank K.   +7 more
openaire   +2 more sources