Trace gas sensing based on multi-quartz-enhanced photothermal spectroscopy [PDF]
Photoacoustics, 2020 A multi-quartz-enhanced photothermal spectroscopy (M-QEPTS) based trace gas detection method is reported for the first time. Different from traditional QEPTS sensor employing a single quartz tuning fork (QTF) as a photothermal detector, two QTFs were ...
Yufei Ma +4 more
doaj +7 more sources
Review of Recent Advances in QEPAS-Based Trace Gas Sensing [PDF]
Applied Sciences, 2018 Quartz-enhanced photoacoustic spectroscopy (QEPAS) is an improvement of the conventional microphone-based photoacoustic spectroscopy. In the QEPAS technique, a commercially available millimeter-sized piezoelectric element quartz tuning fork (QTF) is used
Yufei Ma
doaj +5 more sources
A mini-resonant photoacoustic sensor based on a sphere-cylinder coupled acoustic resonator for high-sensitivity trace gas sensing [PDF]
PhotoacousticsThis paper reports a mini-resonant photoacoustic sensor for high-sensitivity trace gas sensing. The sensor primarily contains a sphere-cylinder coupled acoustic resonator, a cylindrical buffer chamber, and a fiber-optic acoustic sensor.
Guojie Wu +9 more
doaj +4 more sources
Photoacoustic Techniques for Trace Gas Sensing Based on Semiconductor Laser Sources
Sensors, 2009 The paper provides an overview on the use of photoacoustic sensors based on semiconductor laser sources for the detection of trace gases. We review the results obtained using standard, differential and quartz enhanced photoacoustic techniques.
Vincenzo Spagnolo +3 more
doaj +8 more sources
THz QCL-Based Cryogen-Free Spectrometer for in Situ Trace Gas Sensing [PDF]
Sensors, 2013 We report on a set of high-sensitivity terahertz spectroscopy experiments making use of QCLs to detect rotational molecular transitions in the far-infrared.
Paolo De Natale +5 more
doaj +7 more sources
Chirped Laser Dispersion Spectroscopy for Remote Open-Path Trace-Gas Sensing [PDF]
Sensors, 2012 In this paper we present a prototype instrument for remote open-path detection of nitrous oxide. The sensor is based on a 4.53 μm quantum cascade laser and uses the chirped laser dispersion spectroscopy (CLaDS) technique for molecular ...
Gerard Wysocki, Michal Nikodem
doaj +5 more sources
MIR Photoacoustic Trace Gas Sensing Using a Miniaturized 3D Printed Gas Cell
Advanced Photonics 2015, 2015 A miniaturized 3D printed photoacoustic trace gas sensor is presented, using a mid-infrared QCL at 5.26µm as excitation source. Its performance for sensing CH4 resulted in a normalized noise equivalent absorbance of 7.7·10-9cm-1WHz-½.
Bauer, Ralf +3 more
core +9 more sources
Intelligent Algorithm-Assisted Indirect Absorption Spectroscopy for Trace Gas Sensing [PDF]
SensorsPhotoacoustic spectroscopy (PAS), quartz-enhanced photoacoustic spectroscopy (QEPAS), and light-induced thermoelastic spectroscopy (LITES) represent indirect absorption spectroscopy techniques for trace gas sensing, whose performance has long been ...
Yangkun Huang +4 more
doaj +2 more sources
Sub-parts-per-billion CO2 Detection based on Dissipative Whispering Gallery Mode Microcavity Sensor [PDF]
Nature CommunicationsWhispering gallery mode microcavities provide strong light–matter interactions owing to their ultrahigh optical confinement, but the small gas refractive index change limits their ability to sense trace gases.
Shujing Ruan +9 more
doaj +2 more sources
Perspectives of laser-photoacoustic spectroscopy in trace gas sensing
Journal de Physique IV (Proceedings), 2005 Laser-based sensing techniques are attracting great interest in various fields of application, notably in trace gas monitoring and analysis. Among various detection schemes, photoacoustic monitoring offers some unique features. The performance of a laser-photoacoustic system crucially depends on the availability of appropriate laser sources, modulation
M. W. Sigrist, C. Fischer
openaire +2 more sources