Quartz tuning forks resonance frequency matching for laser spectroscopy sensing [PDF]
, 2022 In this paper, we report on the performance of quartz tuning fork (QTF) based laser spectroscopy sensing employing multiple QTFs. To avoid that resonance frequency mismatching of the QTFs degrades the sensor performance, two types of resonance frequency ...
He, Ying +6 more
core +1 more source
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
core +3 more sources
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
doaj +1 more source
Compact GC-QEPAS for On-Site Analysis of Chemical Threats
Sensors, 2022 This paper reports on a compact, portable, and selective chemical sensor for hazardous vapors at trace levels, which is under development and validation within the EU project H2020 “RISEN”. Starting from the prototype developed for a previous EU project, here, we implemented an updated two-stage purge and trap vapor pre-concentration system, a more ...
Nicola Liberatore +6 more
openaire +3 more sources
Quartz-enhanced photo-acoustic spectroscopy for breath analyses [PDF]
, 2017 peer ...
Feng, P +5 more
core +1 more source
Machine Learning-Driven Data Fusion of Chromatograms, Plasmagrams, and IR Spectra of Chemical Compounds of Forensic Interest. [PDF]
ACS OmegaAchieving fast analytical results on-site with the highest possible accuracy in forensic analyses is crucial for investigations. While portable sensors are essential for crime scene analysis, they often face limitations in sensitivity and specificity ...
Felizzato G +7 more
europepmc +3 more sources
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
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
core +3 more sources
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
core +1 more source
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
doaj +1 more source