Molecules, 2020 We report on a fiber-coupled, quartz-enhanced photoacoustic spectroscopy (QEPAS) near-IR sensor for sequential detection of methane (CH4 or C1) and ethane (C2H6 or C2) in air.
Giansergio Menduni +12 more
doaj +1 more source
Piezo-enhanced acoustic detection module for mid-infrared trace gas sensing using a grooved quartz tuning fork [PDF]
, 2019 A grooved quartz tuning fork (QTF) with a prong spacing of 800 μm for QEPAS application is reported. The prongs spacing is large enough to facilitate optical alignments when a degraded laser beam is used for QEPAS-based trace gas sensors. The grooved QTF
Cui, Ruyue +7 more
core +1 more source
Ppb-Level Quartz-Enhanced Photoacoustic Detection of Carbon Monoxide Exploiting a Surface Grooved Tuning Fork [PDF]
, 2019 A compact and sensitive carbon monoxide (CO) sensor was demonstrated by using quartz enhanced photoacoustic spectroscopy (QEPAS) exploiting a novel 15.2 kHz quartz tuning fork (QTF) with grooved surfaces.
Dong, Lei +6 more
core +1 more source
A Miniaturized QEPAS Trace Gas Sensor with a 3D-Printed Acoustic Detection Module
Sensors, 2017 A 3D printing technique was introduced to a quartz-enhanced photoacoustic spectroscopy (QEPAS) sensor and is reported for the first time. The acoustic detection module (ADM) was designed and fabricated using the 3D printing technique and the ADM volume ...
Xiaotao Yang +4 more
doaj +1 more source
Modulation cancellation method for isotope 18O/16O ratio measurements in water [PDF]
, 2012 The application of an innovative spectroscopic balancing technique to measure the isotope 18O/16O ratio in water vapor is reported. Quartz enhanced photoacoustic spectroscopy has been employed as the absorption sensing technique.
Dong L. +3 more
core +1 more source
Enhanced photoacoustic spectroscopy sensitivity through intra-cavity OPO excitation [PDF]
, 2018 We report an optical molecular gas sensor exhibiting high levels of selectivity and sensitivity. The outstanding sensitivity demonstrated by our technology is rooted in a novel combination of photoacoustic spectroscopy (PAS) operated within the cavity of
Polak, Adam, Stothard, David J.M.
core +1 more source
A Mid-infrared QEPAS sensor device for TATP detection
Journal of Physics: Conference Series, 2009 Recent developments of external cavity quantum cascade lasers (EC-QC lasers) enable new applications in laser spectroscopy of trace gas species in the mid-infrared spectral region. We report the application of quartz enhanced photo acoustic spectroscopy (QEPAS) with widely tuneable EC-QC lasers as excitation sources for chemical sensing of different ...
C Bauer +7 more
openaire +1 more source
Near-infrared laser based cavity ringdown spectroscopy for applications in petrochemical industry [PDF]
, 2018 A simple, economic diode laser based cavity ringdown system for trace-gas applications in the petrochemical industry is presented. As acetylene (C2H2) is sometimes present as an interfering contaminant in the gas flow of ethylene (ethene, C2H4) in a ...
Sigrist, M.W., Vogler, D.E.
core
Quartz-Enhanced Photoacoustic Spectroscopy with Right-Angle Prism
Sensors, 2016 A right-angle prism was used to enhance the acoustic signal of a quartz-enhanced photoacoustic spectroscopy (QEPAS) system. The incident laser beam was parallelly inverted by the right-angle prism and passed through the gap between two tuning fork prongs
Yongning Liu +5 more
doaj +1 more source
Development of compact electronics for optical sensors based on photoacoustic spectroscopy for the detection of gas traces [PDF]
Since the first ...
Di Gioia, Michele
core +1 more source