Correlation between two different real time data acquisition systems
Carregando...
Data
Data de publicação:
2019
Autores IPEN
Orientador
Título da Revista
ISSN da Revista
Título do Volume
É parte de
É parte de
É parte de
É parte de
SP SCHOOL OF ADVANCED SCIENCE ON ATMOSPHERIC AEROSOLS
Exportar
Resumo
Fugitive emissions, defined as unintended or irregular leaks of gases and vapors, are an important
source of air pollution that is difficult to monitor and control. These sites, including megacities
like São Paulo, are growing in size and economic activity. At the same time, there is a remarkable
growth in concerns about the environmental issues associated with these activities. In a constantly
changing world, with increasing concentrations of greenhouse gases (GHGs), among them methane
(CH4) and volatile organic compounds (VOC), mitigation of atmospheric emission of these gases
to contain global warming, make field campaigns in the metropolitan region of São Paulo very
relevant. Optical remote sensing techniques as lidar can attend the need for real time and trustable
information on fugitive emissions. The Cavity Ringdown Laser Spectroscopy (CRDS) technique
was adopted because it is widely used in the detection of gas samples that absorb light at specific
wavelengths and also for their ability to detect mole fractions up to the parts per trillion level.
The Raman LIDAR system used includes a commercial laser pulsed Nd:YAG Quantel S.A., model
CFR 200, with wavelengths of 355 nm, 353 nm and 396 nm, 120 mJ pulse power, with laser
repetition rate of 20 Hz and pulse width of 20 s, with a spatial resolution of 7,5 m. The system
includes an ethernet interface, used together with LabView software to control the measurement
and readout of the acquired data. The mixing ratio of CH4 can be observed within the planetary
boundary layer. The measured methane profiles correlate with the acquisitions made with the
CRDS, however, an additional contribution of control data in which the Raman lines detect with
high sensitivity.
Como referenciar
MACEDO, F. Correlation between two different real time data acquisition systems: LIDAR Raman and Cavity Ringdown Laser Spectroscopy, for CH4 as a fugitive gas, in São Paulo Metropolitan Area. In: SP SCHOOL OF ADVANCED SCIENCE ON ATMOSPHERIC AEROSOLS, July 22 - August 2, 2019, São Paulo, SP. Abstract... São Paulo, SP: Instituto de Física - USP, 2019. p. 77-77. Disponível em: http://repositorio.ipen.br/handle/123456789/32215. Acesso em: 25 Apr 2024.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.