Results 11 to 20 of about 3,296,247 (272)
Recent Advances in QEPAS and QEPTS Based Trace Gas Sensing: A Review
Frontiers in Physics, 2020 This invited review paper summarizes and discusses developments of QTF based state-of-the-art quartz-enhanced photoacoustic spectroscopy (QEPAS) and quartz-enhanced photothermal spectroscopy (QEPTS) gas sensing techniques over the past 3 years.
Yufei Ma
doaj +3 more sources
A fugacity approach for generating a landfill gas trace component source term. [PDF]
, 2005 The quality of risk assessment output is determined by the input data used in environmental distribution, dispersion and exposure models. Whilst recent focus has been on the development of regulatory exposure assessment models for landfills, risk ...
Rosevear, Alan +4 more
core +7 more sources
Carbon Nanotube-Based Gas Sensors: Sensing Mechanisms, Functional Interfaces, Gas-Specific Performance, and Flexible/Wearable Integration [PDF]
SensorsCarbon nanotubes (CNTs) have become one of the most widely investigated nanomaterials for gas sensing because their nearly one-dimensional geometry, large surface-to-volume ratio, hollow structure, and tunable metallic or semiconducting character allow ...
Daewoong Jung
doaj +2 more sources
Sensitivity of remotely sensed trace gas concentrations to polarisation [PDF]
Atmospheric Measurement Techniques, 2015 Abstract. Current and proposed space missions estimate column-averaged concentrations of trace gases (CO2, CH4 and CO) from high resolution spectra of reflected sunlight in absorption bands of the gases. The radiance leaving the top of the atmosphere is partially polarised by both reflection at the surface and scattering within the atmosphere ...
D. M. O'Brien +2 more
openaire +3 more sources
Trace Gas Remote Sensing by Lasers [PDF]
Optik & Photonik, 2013 AbstractActive remote sensing represents a promising technology to accurately measure the atmospheric concentration of the climate‐relevant trace gases carbon dioxide and methane. For this application, frequency stabilized laser sources with high pulse energy emitting at specific absorption lines around 1.6 μm wavelength are required.
Oliver Lux +2 more
openaire +1 more source
Integrated Resonant Micro/Nano Gravimetric Sensors for Bio/Chemical Detection in Air and Liquid
Micromachines, 2021 Resonant micro/nanoelectromechanical systems (MEMS/NEMS) with on-chip integrated excitation and readout components, exhibit exquisite gravimetric sensitivities which have greatly advanced the bio/chemical sensor technologies in the past two decades. This
Hao Jia, Pengcheng Xu, Xinxin Li
doaj +1 more source
Journal of Remote Sensing, 2023 High spatial-temporal resolution distribution of atmospheric gaseous pollutant is an important basis for tracing its emission, transport, and transformation. Typical methods for acquiring regional atmospheric gaseous pollutant distributions are satellite
Chuan Lu +9 more
doaj +1 more source
Quartz-enhanced photoacoustic-photothermal spectroscopy for trace gas sensing
Optics Express, 2021 A trace gas detection technique of quartz-enhanced photoacoustic-photothermal spectroscopy (QEPA-PTS) is demonstrated. Different from quartz-enhanced photoacoustic spectroscopy (QEPAS) or quartz-enhanced photothermal spectroscopy (QEPTS), which detected only one single kind of signal, QEPA-PTS was realized by adding the photoacoustic and photothermal ...
Yinqiu Hu +4 more
openaire +2 more sources
Optical gas sensing: a review [PDF]
, 2013 The detection and measurement of gas concentrations using the characteristic optical absorption of the gas species is important for both understanding and monitoring a variety of phenomena from industrial processes to environmental change.
Hodgkinson, Jane, Tatam, Ralph P.
core +1 more source
Characterization and verification of ACAM slit functions for trace-gas retrievals during the 2011 DISCOVER-AQ flight campaign [PDF]
Atmospheric Measurement Techniques, 2015 The Airborne Compact Atmospheric Mapper (ACAM), an ultraviolet/visible/near-infrared spectrometer, has been flown on board the NASA UC-12 aircraft during the Deriving Information on Surface Conditions from Column and Vertically Resolved Observations ...
C. Liu +7 more
doaj +1 more source