CCD camera image analysis for mapping solute concentrations in saturated porous media

Autor:	C. Eberhardt, Massimo Rolle, Guenter Gauglitz, Stefanie Jaeger, Peter Grathwohl, Markus Ehni
Rok vydání:	2009
Předmět:	Optics Computer simulation Sampling (signal processing) business.industry Scattering TRACER Noise reduction Charge-coupled device business Absorption (electromagnetic radiation) Porous medium Biochemistry Analytical Chemistry
Zdroj:	Analytical and Bioanalytical Chemistry. 395:1867-1876
ISSN:	1618-2650 1618-2642
Popis:	This paper presents an optical approach, based on the use of a low-cost charge-coupled device (CCD) camera, for the quantitative determination of solute concentrations in saturated porous media. The method is applied to evaluate tracer experiments carried out in a laboratory model tank. The CCD photos deliver RGB values which are transferred into concentrations for the evaluation of vertical concentration profiles over the whole tank area. A specially developed evaluation procedure, including internal referencing for noise reduction, considers the colour of the adjacencies of the evaluated spots and scattering effects. The CCD data evaluation technique is accompanied by conventional sampling and absorption measurements and by numerical flow and transport simulations. This non-invasive technique allows a direct mapping of the concentration distribution without any disturbance of the solute plume. Therefore, it turns out to be an important tool for a detailed investigation of fundamental processes (e.g. transverse dispersion) determining the solute (e.g. contaminant) transport in porous media.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9ebe416b6e87f2e9de053c3a5aa9a9b8 https://doi.org/10.1007/s00216-009-2978-3 Zobrazit plný text záznamu Plný text ve formátu PDF