Characterization of a UV camera system for SO2 measurements from Popocatepetl Volcano
Por:
Schiavo B., Stremme W., Grutter M., Campion R., Guarin C.A., Rivera C., Inguaggiato S.
Publicada:
15 ene 2019
Ahead of Print:
1 ene 2018
Resumen:
Since 2016, a UV camera records images of the Popocatepetl Volcano for
continuous monitoring of the SO2 plume. Five band-pass filters (300a,
300b, 307, 310, 330) with the different bandwidth (BW) of 10 and 25 nm
with transmissions centered at 300 nm (BW = 10)nm), 300 nm (BW = 25 nm),
307 nm (BW = 25 nm), 310 nm (BW = 10 nm)and 330 nm (BW =10 nm) are used
for the analysis. In order to fully characterize the filters and improve
our knowledge of the errors affecting the results, the UV camera was
used together with a UV spectrometer for experiments and measurements.
Gas cells with different concentrations were prepared to simulate field
conditions and to calibrate the SO2 column images when measuring from a
fixed site. Our study is focused on a) applying the required corrections
due to vignetting by the instrumentation as well as flattening the light
intensity gradients in the field of view, b) determining the effect on
the results when using different interference filters, c) applying a
simplified light dilution correction and d) performing an a posteriori
calibration correction using four interference filters. Our results show
that a permanently installed and well-characterized camera, even with
the rather long distance from the crater (11.3 km), can provide valuable
and reliable information of the SO2 emissions from the Popocatepetl
Volcano. (C) 2018 Elsevier B.V. All rights reserved.
Filiaciones:
Centro de Ciencias de la Atmósfera, Universidad Nacional Autónoma de México, Mexico City, Mexico
Departamento de Vulcanología, Instituto de Geofísica, Universidad Nacional Autónoma de México, Mexico City, Mexico
Departamento de Física, Universidad Autónoma Metropolitana, Mexico City, Mexico
Facultad de Química UNAM, Ciudad Universitaria, México, DF 04510, Mexico
Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Palermo, Via Ugo La Malfa, 153, Palermo, 90146, Italy
Univ Nacl Autonoma Mexico, Ctr Ciencias Atmosfera, Mexico City, DF, Mexico
Univ Nacl Autonoma Mexico, Inst Geofis, Dept Vulcanol, Mexico City, DF, Mexico
Univ Autonoma Metropolitana, Dept Fis, Mexico City, DF, Mexico
Univ Nacl Autonoma Mexico, Fac Quim, Ciudad Univ, Mexico City 04510, DF, Mexico
Ist Nazl Geofis & Vulcanol, Sez Palermo, Via Ugo La Malfa 153, I-90146 Palermo, Italy
Facultad de Química UNAM, Ciudad Universitaria, México DF, 04510, Mexico
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