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

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 phot...

Full description

Saved in:
Bibliographic Details
Published in:Analytical and bioanalytical chemistry 2009-11, Vol.395 (6), p.1867-1876
Main Authors: Jaeger, Stefanie, Ehni, Markus, Eberhardt, Christina, Rolle, Massimo, Grathwohl, Peter, Gauglitz, Guenter
Format: Article
Language:English
Subjects:
Analytical Chemistry
Biochemistry
Characterization and Evaluation of Materials
Charge coupled devices
Chemistry
Chemistry and Materials Science
Food Science
Laboratory Medicine
Mapping
Mathematical models
Monitoring/Environmental Analysis
Original Paper
Porous media
Sampling
Tanks
Transport
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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. [graphic removed]
ISSN:1618-2642
1618-2650
DOI:10.1007/s00216-009-2978-3