Results 141 to 150 of about 825 (180)

Intracavity-QEPAS sensor for methane isotopic ratio detection

Report on the optical performance and stability of the intracavity QEPAS sensing platform developed in ESR15 for 13CH4/12CH4 isotopic ratio.
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Harmonic phase-sensitive detection for quartz-enhanced photoacoustic-thermoelastic spectroscopy. [PDF]

Photoacoustics
Hu M, Zhang D, Zhang H, Liu Y, Wang W, Wang Q.   +5 more
europepmc   +1 more source

Lithium Niobate - Enhanced Photoacoustic Spectroscopy. [PDF]

Photoacoustics
Cantatore AFP, Menduni G, Zifarelli A, Patimisco P, Gonzalez M, Seren HR, Spagnolo V, Sampaolo A.   +7 more
europepmc   +1 more source

Open-closed single-tube on-beam tuning-fork-enhanced fiber-optic photoacoustic spectroscopy. [PDF]

Photoacoustics
Pan Y, Fu L, Zhang J, Lu P.
europepmc   +1 more source

Regulation of qepA efflux pump expression in Escherichia coli

, 2018
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QEPAS sensor in a butterfly package and its application

Applied Optics, 2021
Molecular gases are highly relevant in healthcare, production control, safety, and environmental monitoring. They often appear in small concentrations. The measurement of trace gases has increasingly become a key technique in those domains. Quartz-enhanced photoacoustic spectroscopy (QEPAS) is a suitable method that can provide the required low ...
Tobias Milde, Morten Hoppe, Herve Tatenguem, Hanna Rohling, Sebastian Schmidtmann, Martin Honsberg, Wolfgang Schade, Joachim Sacher   +7 more
openaire   +2 more sources

A QEPAS Sensor in a Butterfly Package

Optical Sensors and Sensing Congress, 2020
Quartz-Enhanced-Photo-Acoustic-Spectroscopy (QEPAS) is a modern, promising trace gas measuring technique. One main advantage of QEPAS over other trace-gas spectroscopes is its size. The miniaturization of the sensor-system is the next big challenge in the development.
Tobias Milde, Morten Hoppe, Hervé Tatenguem, Hanna Rohling, Sebastian Schmidtmann, Martin Honsberg, Wolfgang Schade, Joachim Sacher   +7 more
openaire   +1 more source

Broadband QEPAS with IR-LEDs

Conference on Lasers and Electro-Optics 2012, 2012
An IR-LED at 3.4 μm and an off-beam QEPAS cell as detector are utilized for absorption spectroscopy. For 10 cm absorption path a detection limit of 382 ppm is achieved for methane.
Stefan Böttger, Ulrike Willer, Wolfgang Schade   +2 more
openaire   +1 more source