Results 21 to 30 of about 21,982 (208)
Excessive alcohol consumption induces methane production in humans and rats
Scientific Reports, 2017 Various studies have established the possibility of non-bacterial methane (CH4) generation in oxido-reductive stress conditions in plants and animals.
E. Tuboly +12 more
doaj +1 more source
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
core +1 more source
Detection of Molecular Oxygen at Low Concentrations Using Quartz Enhanced Photoacoustic Spectroscopy
Sensors, 2010 Molecular oxygen is detected at low concentrations using photoacoustic spectroscopy despite its unfavorable photoacoustic properties. The system consists of a seed laser diode, a tapered amplifier and a quartz tuning fork based spectrophone, thus ...
Andreas Pohlkötter +3 more
doaj +1 more source
Quartz-enhanced photoacoustic spectroscopy [PDF]
Optics Letters, 2002 A new approach to detecting a weak photoacoustic signal in a gas medium is described. Instead of a gas-filled resonant acoustic cavity, the sound energy is accumulated in a high- Q crystal element. Feasibility experiments utilizing a quartz-watch tuning fork demonstrate a sensitivity of 1.2x10(-7) cm(-1) W/ radicalHz .
A A, Kosterev +3 more
openaire +2 more sources
Linearized Reconstruction for Diffuse Optical Spectroscopic Imaging [PDF]
, 2018 In this paper, we present a novel reconstruction method for diffuse optical spectroscopic imaging with a commonly used tissue model of optical absorption and scattering.
Ammari, Habib +2 more
core +2 more sources
Consideration of Temperature and Slip Correction for Photothermal Spectrometry
Asian Journal of Atmospheric Environment, 2015 Temperature was considered to estimate the minimum detectable absorption coefficient of aerosol particles from photothermal spectroscopy. Light energy absorbed by subsequent emission from the aerosol results in the heating of the aerosol sample and ...
Jeonghoon Lee
doaj +1 more source
Modeling thin-film piezoelectric polymer ultrasonic sensors [PDF]
, 2014 This paper presents a model suitable to design and characterize broadband thin film sensors based on piezoelectric polymers. The aim is to describe adequately the sensor behavior, with a reasonable number of parameters and based on well-known physical ...
Cardozo Santiago, Gustavo David +2 more
core +1 more source
Optical Frequency Comb Photoacoustic Spectroscopy [PDF]
2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC), 2018 Optical frequency comb photoacoustic spectroscopy (OFC-PAS) is demonstrated for the first time for broadband high-resolution trace gas analysis in small sample volumes.
Ibrahim Sadiek +4 more
openaire +8 more sources
Quartz-Enhanced Photoacoustic Spectroscopy for One-Health [PDF]
EPJ Web of Conferences, 2023 We report on the development of Quartz-Enhanced Photoacoustic Spectroscopy (QEPAS) technology to detect 8 different air pollutants, namely CH4, NO2, CO2, N2O, CO, NO, SO2 and NH3, with the same acoustic detection module and interchangeable laser sources,
Patimisco Pietro +9 more
doaj +1 more source
Photonic Sensors, 2019 A trace ammonia (NH3) detection system based on the near-infrared fiber-optic cantilever-enhanced photoacoustic spectroscopy (CEPAS) is proposed. A fiber-optic extrinsic Fabry-Perot interferometer (EFPI) based cantilever microphone has been designed to ...
Min Guo +3 more
doaj +1 more source