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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Characterization of a UV camera system for SO_2 measurements from Popocatepetl Volcano
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Characterization of a UV camera system for SO_2 measurements from Popocatepetl Volcano

机译：用于Popocatepetl火山的SO_2测量的紫外相机系统的特性

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摘要

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.
机译：自2016年以来，一台紫外线摄像机记录了Popocatepetl火山的图像，以持续监测SO2羽流。五个带通滤波器（300a，300b，307、310、330），其带宽（BW）为10和25 nm，传输中心为300 nm（BW = 10）nm，300 nm（BW = 25 nm） 307 nm（BW = 25 nm），310 nm（BW = 10 nm）和330 nm（BW = 10 nm）用于分析。为了充分表征滤光片并提高我们对影响结果的误差的了解，将紫外线照相机与紫外线光谱仪一起用于实验和测量。从固定位置进行测量时，准备了具有不同浓度的气室以模拟现场条件并校准SO2柱图像。我们的研究集中在：a）通过仪器渐晕来进行所需的校正，以及展平视场中的光强度梯度，b）在使用不同的干涉滤光片时确定对结果的影响，c）应用简化的方法。 d）使用四个干涉滤光片进行后验校正。我们的结果表明，即使距火山口的距离相当长（11.3公里），永久安装且性能良好的摄像机也可以提供有关Popocatepetl火山SO2排放的有价值且可靠的信息。 （C）2018 Elsevier B.V.保留所有权利。

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