Results 161 to 170 of about 3,994 (183)
Some of the next articles are maybe not open access.
Ethylene Trace Detection by Quartz Enhanced Photoacoustic Spectroscopy
Conference on Lasers and Electro-Optics/International Quantum Electronics Conference, 2009Ethylene (C 2 H 4 ) absorption line intensity at 6172.95 cm−1 was determined for trace gas detection. C 2 H 4 trace concentration measurements were performed using quartz enhanced photoacoustic spectroscopy (QEPAS) with a sensitivity of 1.3 ppmv (1σ) for τ=1s time constant. The effect of modulation frequency accuracy on QEPAS signal was investigated.
K. Liu +5 more
openaire +1 more source
Quartz Enhanced Photoacoustic Spectroscopy: Today and Beyond
Lasers, Sources and Related Photonic Devices, 2010Current 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.
openaire +1 more source
New developments in THz quartz enhanced photoacoustic spectroscopy
SPIE Proceedings, 2016We 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 +6 more
openaire +3 more sources
Quartz Enhanced Photoacoustic Spectroscopy for Human Breath Analysis
Frontiers in Optics 2016, 2016Simultaneous 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 +4 more
openaire +1 more source
Quartz-Enhanced Photoacoustic Spectroscopy for Environmental Monitoring
Air pollution is a critical global issue, contributing to over 4.2 million deaths annually due to stroke, heart disease, lung cancer, and chronic respiratory diseases. It also poses significant economic and social challenges, including increased healthcare costs and reduced productivity. The need for real-time, high-resolution air quality monitoring isPietro Patimisco +5 more
openaire +1 more source
Tapered acoustic resonator-based quartz-enhanced photoacoustic spectroscopy
Optics LettersIn this paper, a quartz-enhanced photoacoustic spectroscopy (QEPAS) sensor based on a novel tapered acoustic resonator (TAR) was proposed for the first time, to our knowledge. The proposed structure not only enhances acoustic signals but also substantially reduces the demands on beam quality and optical alignment, leading to ...
Chenzhao Sang +5 more
openaire +1 more source
Quartz‐Enhanced Photoacoustic Spectroscopy for Trace Gas Sensing
2021Photoacoustic spectroscopy (PAS) was established itself over the last decades as a powerful detection technique, capable of measuring trace gas concentrations at part‐per‐billion level. The basic principles of laser PAS are provided with a discussion on photoinduced acoustic wave generation and its detection. Quartz‐enhanced photoacoustic spectroscopy (
Patimisco, Pietro, Spagnolo, Vincenzo
openaire +1 more source
Quartz-enhanced photoacoustic spectroscopy for multi-gas detection: A review
Analytica Chimica Acta, 2022Angelo Sampaolo +2 more
exaly