Passive Electrical Damping of a Quartz Tuning Fork as a Path to Fast Resonance Tracking in QEPAS
Sensors, 2021 In Quartz-Enhanced PhotoAcoustic Spectroscopy (QEPAS) gas sensors, the acoustic wave is detected by the piezoelectric Quartz Tuning Fork (QTF). Due to its high-quality factor, the QTF can detect very low-pressure variations, but its resonance can also be
Roman Rousseau +4 more
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QEPAS based ppb-level detection of CO and N2O using a high power CW DFB-QCL [PDF]
, 2013 An ultra-sensitive and selective quartz-enhanced photoacoustic spectroscopy (QEPAS) sensor platform was demonstrated for detection of carbon monoxide (CO) and nitrous oxide (N2O). This sensor used a stateof- the art 4.61 μm high power, continuous wave
Bauer +32 more
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Quartz Enhanced Photoacoustic Detection Based on an Elliptical Laser Beam
Applied Sciences, 2020 A quartz enhanced photoacoustic spectroscopy (QEPAS) sensor system based on an elliptical laser beam for trace gas detection was demonstrated. A Powell lens was exploited to shape the circular laser beam into an elliptical laser beam for the full ...
Zhijin Shang +3 more
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Compact all-fiber quartz-enhanced photoacoustic spectroscopy sensor with a 30.72 kHz quartz tuning fork and spatially resolved trace gas detection [PDF]
, 2016 An ultra compact all-fiber quartz-enhanced photoacoustic spectroscopy (QEPAS) sensor using quartz tuning fork (QTF) with a low resonance frequency of 30.72 kHz was demonstrated.
He, Ying +5 more
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Sub-parts-per-trillion level sensitivity in trace gas detection by cantilever-enhanced photo-acoustic spectroscopy [PDF]
, 2018 An exceptional property of photo-acoustic spectroscopy is the zero-background in wavelength modulation configuration while the signal varies linearly as a function of absorbed laser power.
Halonen, Lauri +3 more
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Development of compact and innovative optical sensors for trace gas detection [PDF]
, 2021 Trace gas sensing is crucial in several application fields. In this thesis, Quartz Enhanced Photoacoustic Spectroscopy (QEPAS)-based sensors were studied, designed and employed to detect gas traces.
Menduni, Giansergio
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On-chip mid-infrared photothermal spectroscopy using suspended silicon-on-insulator microring resonators [PDF]
, 2016 Mid-infrared spectroscopic techniques rely on the specific "fingerprint" absorption lines of molecules in the mid-infrared band to detect the presence and concentration of these molecules.
Baets, Roel +5 more
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Applied Sciences, 2020 In this paper the performances of two spectrophones for quartz-enhanced photoacoustic spectroscopy (QEPAS)-based ethane gas sensing were tested and compared.
Fabrizio Sgobba +9 more
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Frontiers in Physics, 2022 A convenient method of light intensity correction for quartz-enhanced photoacoustic spectroscopy (QEPAS) using photothermal baseline is demonstrated. The laser beam passes through the prongs of the quartz tuning fork (QTF) and then focused on the root of
Xiang Chen +8 more
doaj +1 more source
Low noise, open-source QEPAS system with instrumentation amplifier [PDF]
Scientific Reports, 2019 AbstractQuartz enhanced photoacoustic spectroscopy (QEPAS) is a rapidly developing, ultrasensitive method for trace gas sensing. Adequate electronic amplifier, well matched to the quartz characteristics is crucial for overall system performance. Here we present an open source circuit for QEPAS signal amplification.
Mateusz Winkowski, Tadeusz Stacewicz
openaire +2 more sources