Results 181 to 190 of about 2,335 (228)

A Dual-Gas Sensing System Based on QEPAS and LITES

IEEE Sensors Journal
A dual-gas sensing system based on quartz-enhanced photoacoustic spectroscopy (QEPAS) and laser-induced thermoelastic spectroscopy (LITES) has been proposed.
L. Qin, Shaoqiang Bi, Jingqi Shi, Yiyang Zhao, Xinru Zhang, Zhonghai Zhang, Xuan Liu, Zongliang Wang   +7 more
semanticscholar   +1 more source

QEPAS sensor with widely tunable IC-ECL for quasi-simultaneous monitoring of trace gases

Optica Sensing Congress 2023 (AIS, FTS, HISE, Sensors, ES), 2023
We report the application of QEPAS in combination with a widely tunable IC-based laser system for sequential quasi-simultaneous monitoring of trace gases. Tuning range, output power and detection rate requirements are met by our work.
Morten Hoppe, H. Tatenguem, C. Assmann, S. Schmidtmann, M. Honsberg, J. Sacher   +5 more
semanticscholar   +1 more source

Ppb-Level Detection of Methane Using Quartz Enhanced Photoacoustic Spectroscopy (QEPAS) Combined with Bismuth-Doped Fiber Amplifier

2023 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC), 2023
Quartz-enhanced photoacoustic spectroscopy (QEPAS) was introduced in 2002 and quickly became one of the most popular methods for laser-based trace-gas detection.
Magdalena Zatorska, Michal Nikodem
semanticscholar   +1 more source

QEPAS sensor for breath analysis: a behavior of pressure

Applied Optics, 2018
The measurement of trace gases has increasingly become a key technique in healthcare and other medical applications. Quartz-enhanced photoacoustic spectroscopy (QEPAS) is a suitable method that can provide the required characteristics in such applications for a comparatively low cost and small size.
Tobias Milde, Morten Hoppe, Herve Tatenguem, Mario Mordmüller, James O’Gorman, Ulrike Willer, Wolfgang Schade, Joachim Sacher   +7 more
openaire   +2 more sources

Optimized DFB laser diodes for a Butterfly QEPAS Sensor

OSA Optical Sensors and Sensing Congress 2021 (AIS, FTS, HISE, SENSORS, ES), 2021
Optimized DFB lasers are presented. Results for the performance and its suitability for detecting trace gases are shown. We present our new QEPAS compact detection unit where everything is integrated into 14-pin butterfly housing.
Tobias Milde, Morten Hoppe, Hervé Tatenguem, Sebastian Schmidtmann, Christian Assmann, Martin Honsberg, Joachim Sacher   +6 more
openaire   +1 more source

Modeling and Design of a Semi-Integrated QEPAS Sensor

Journal of Lightwave Technology, 2021
Quartz enhanced photo acoustic spectroscopy (QEPAS) has gained a growing interest in recent years for gas sensing technology because of the high sensitivity provided by sharp resonant tuning forks (QTFs) exploited as piezoelectric sound wave detectors; and the modularity, compactness, and robustness of the sensors.
Martino De Carlo, Giansergio Menduni, Angelo Sampaolo, Francesco De Leonardis, Vincenzo Spagnolo, Vittorio M. N. Passaro   +5 more
openaire   +1 more source

Front-end Electronics for the Characterization of Quartz Tuning Forks in QEPAS Sensors

International Workshop on Advances in Sensors and Interfaces
In the Quartz-Enhanced Photoacoustic Spectroscopy (QEPAS) technique, a laser source modulated with a sinusoidal signal interacts with the target gas, generating acoustic waves.
Vincenzina Zecchino, Luigi Lombardi, C. Marzocca, G. Matarrese, P. Patimisco, A. Sampaolo, V. Spagnolo   +6 more
semanticscholar   +1 more source

Multi-species gas sensor based on QEPAS with wide tunable IC-ECDL for the MIR region

Conference on Lasers and Electro-Optics, 2023
An IC-ECL for the coverage of the MIR region with outstanding performance, especially with respect to high acquisition rates, is presented. The results of the performance analysis and the QEPAS-based detection of multispecies are shown.
Morten Hoppe, C. Assmann, S. Schmidtmann, M. Honsberg, H. Tatenguem, J. Sacher   +5 more
semanticscholar   +1 more source

Single off-beam exciting dual-quartz-tuning-fork resonance-enhanced QEPAS trace gas sensing

Chinese Optics Letters (COL)
In this Letter, a quartz-enhanced photoacoustic spectroscopy (QEPAS) gas sensor based on a single off-beam acoustic micro-resonator (AmR) and dual quartz tuning forks (QTFs) was demonstrated for the first time, to our knowledge.
Bangyu Liu, Shunda Qiao, Ying He, Yufei Ma   +3 more
semanticscholar   +1 more source

Intra-cavity QEPAS gas sensor based on fiber-ring laser for C2H2 detection

Applied Optics and Photonics China, 2023
Quartz enhanced photoacoustic spectroscopy (QEPAS) is a high performance trace gas detection technique that plays an important role in food safety, pollution monitoring and breath analysis applications.
Qinduan Zhang, Binkai Li, Xiao-Rui Du, Yubin Wei, Tingting Zhang, Weihua Gong, Zhaowei Wang, Guancheng Liu   +7 more
semanticscholar   +1 more source