Results 31 to 40 of about 120,634 (290)
Three-dimensional radiative transfer effects on airborne and ground-based trace gas remote sensing [PDF]
Atmospheric Measurement Techniques, 2020 Air mass factors (AMFs) are used in passive trace gas remote sensing for converting slant column densities (SCDs) to vertical column densities (VCDs).
M. Schwaerzel +8 more
doaj +1 more source
Greenhouse gases in cold water filaments in the Arabian Sea during the Southwest Monsoon [PDF]
, 1999 The distribution of partial pressure of carbon dioxide and the concentrations of nitrous oxide and methane were investigated in a cold water filament near the coastal upwelling region off Oman at the beginning of the southwest monsoon in 1997.
Al Habsi, S. +7 more
core +1 more source
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
Continuous wave optical parametric oscillator for quartz-enhanced photoacoustic trace gas sensing [PDF]
, 2007 A continuous wave optical parametric oscillator, generating up to 300 mW idler output in the 3–4 μm wavelength region, and pumped by a fiber-amplified DBR diode laser is used for trace gas detection by means of quartz-enhanced photoacoustic spectroscopy (
A. Henderson +33 more
core +6 more sources
Cylindrical multipass reflection cells for optical trace gas sensing [PDF]
CLEO: 2015, 2015 Single-piece cylindrical multipass cells effectively fold a long optical path in a small detection volume. We present a systematic survey of various cell configurations and the respective mirror shapes for enhanced path-to-volume ratios.
Markus Mangold +3 more
openaire +1 more source
Gas Sensor Based on 3-D WO3 Inverse Opal: Design and Applications
Sensors, 2017 A three-dimensional inverse opal (3DIO) WO3 architecture has been synthesized via a simple sacrificial template method. Morphology features of the 3DIO were characterized by scanning electron microscope (SEM) and its structure was characterized by X-ray ...
Ruiqing Xing +3 more
doaj +1 more source
Sensors, 2023 Novel optical gas-sensing materials for Au nanoparticle (NP)-modified ZnO nanorod (NR) arrays were fabricated using hydrothermal synthesis and magnetron sputtering on Si substrates.
Baosheng Du +5 more
doaj +1 more source
Open-Air, Broad-Bandwidth Trace-Gas Sensing with a Mid-Infrared Optical Frequency Comb
, 2014 A mid-Infrared frequency comb is produced via an optical parametric oscillator (OPO) pumped by an amplified 100 MHz Yb:fiber mode-locked laser. We use this source to make measurements of the concentration of the atmospherically-relevant species of CH4 ...
Diddams, Scott A. +2 more
core +1 more source
Screening model for nanowire surface-charge sensors in liquid [PDF]
, 2007 The conductance change of nanowire field-effect transistors is considered a highly sensitive probe for surface charge. However, Debye screening of relevant physiological liquid environments challenge device performance due to competing screening from the
Ashcroft N. W. +4 more
core +2 more sources
Multi-species trace gas sensing with dual-wavelength QCLs [PDF]
Applied Physics B, 2018 Instrumentation for environmental monitoring of gaseous pollutants and greenhouse gases tends to be complex, expensive, and energy demanding, because every compound measured relies on a specific analytical technique. This work demonstrates an alternative approach based on mid-infrared laser absorption spectroscopy with dual-wavelength quantum cascade ...
P. Morten Hundt +9 more
openaire +1 more source