Results 21 to 30 of about 3,296,247 (272)
Photoacoustic methane detection inside a MEMS microphone
Photoacoustics, 2023 An innovative laser based photoacoustic (PA) gas sensing concept with intrinsic miniaturization potential was developed and investigated for methane trace gas detection.
Thomas Strahl +4 more
doaj +1 more source
Low Power Greenhouse Gas Sensors for Unmanned Aerial Vehicles
Remote Sensing, 2012 We demonstrate compact, low power, lightweight laser-based sensors for measuring trace gas species in the atmosphere designed specifically for electronic unmanned aerial vehicle (UAV) platforms.
David J. Lary +8 more
doaj +1 more source
PLoS ONE, 2022 A quantitative monitoring system for fractional exhaled nitric oxide (FENO) in homes is very important for the control of respiratory diseases such as asthma.
Pengjiao Sun, Yunbo Shi, Yeping Shi
doaj +2 more sources
Assessing the ability to derive rates of polar middle-atmospheric descent using trace gas measurements from remote sensors [PDF]
Atmospheric Chemistry and Physics, 2018 We investigate the reliability of using trace gas measurements from remote sensing instruments to infer polar atmospheric descent rates during winter within 46–86 km altitude. Using output from the Specified Dynamics Whole Atmosphere Community Climate
N. J. Ryan +6 more
doaj +1 more source
Chirped-pulse terahertz spectroscopy for broadband trace gas sensing
Optics Express, 2011 We report the first demonstration of a broadband trace gas sensor based on chirp-pulse terahertz spectroscopy. The advent of newly developed solid state sources and sensitive heterodyne detectors for the terahertz frequency range have made it possible to generate and detect precise arbitrary waveforms at THz frequencies with ultra-low phase noise.
Gerecht, Eyal +2 more
openaire +2 more sources
Structural and gas-sensing properties of CuO–CuxFe3−xO4 nanostructured thin films [PDF]
, 2010 Nanocrystalline CuO–CuxFe3−xO4 thin films were developed using a radio-frequency sputtering method followed by a thermal oxidation process. Thin films were deposited applying two very different conditions by varying the argon pressure and the target-to ...
Pasquet, Isabelle +17 more
core +1 more source
Towards imaging of atmospheric trace gases using Fabry–Pérot interferometer correlation spectroscopy in the UV and visible spectral range [PDF]
Atmospheric Measurement Techniques, 2019 Many processes in the lower atmosphere including transport, turbulent mixing and chemical conversions happen on timescales of the order of seconds (e.g. at point sources). Remote sensing of atmospheric trace gases in the UV and visible spectral range (UV–
J. Kuhn +6 more
doaj +1 more source
Sensors, 2023 We demonstrate the successful implementation of an artificial neural network (ANN) to eliminate detrimental spectral shifts imposed in the measurement of laser absorption spectrometers (LASs).
Sanghoon Chin +7 more
doaj +1 more source
Miniaturized Photoacoustic Trace Gas Sensing Using a Raman Fiber Amplifier [PDF]
Journal of Lightwave Technology, 2015 This paper presents the development of a Raman fiber amplifier optical source with a maximum output power of 1.1 W centered around 1651 nm, and its application in miniaturized 3D printed photoacoustic spectroscopy (PAS) trace gas sensing of methane. The Raman amplifier has been constructed using 4.5 km of dispersion shifted fiber, a 1651 nm DFB seed ...
Bauer, Ralf +6 more
openaire +3 more sources
Recent Development of Gas Sensing Platforms Based on 2D Atomic Crystals
Research, 2021 Sensors, capable of detecting trace amounts of gas molecules or volatile organic compounds (VOCs), are in great demand for environmental monitoring, food safety, health diagnostics, and national defense. In the era of the Internet of Things (IoT) and big
Jiacheng Cao +6 more
doaj +1 more source