Measurement of Dye Concentrations by Photography

by Peter R. B. Ward, (A.M.ASCE), Asst. Prof.; Dept. of Civ. Engrg., Univ. of British Columbia, Vancouver, BC, Canada,

Serial Information: Journal of the Environmental Engineering Division, 1973, Vol. 99, Issue 3, Pg. 165-175

Document Type: Journal Paper


A method of measuring concentrations of solutions of dye for dispersion studies in laboratory channels is described. The method uses black and white photography, followed by analysis of the photographs with a microdensitometer to determine dye concentration. The calibration curve was measured by photographing a group of bowls with solutions of known concentration. Routine use of the method showed it was reproducible and enabled measurements at many hundred points to be made with a single photograph.

Subject Headings: Dyes | Photography | Laboratory tests | Calibration | Curvature

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