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Water Science and Technology Vol 37 No 12 pp 255–261 © IWA Publishing 1998 Remote turbidity measurement with a laser reflectometerMark JohnsonTechnology Development Team, North West Water Ltd, Dawson House Great Sankey, Warrington WA5 3LW UK ABSTRACT A simple, laser-based reflectometer is described for the measurement of water turbidity via 180o optical scattering. Applications exist both in clean source waters (0-1000NTU) with a minimum detectable turbidity better than 1NTU, and in dense wastewater primary-clarifier sludges. The non-contact measurement is performed from a distance at least up to 10m, substantially avoiding the usual window fouling problems of optical instruments. By measuring directly in the process, through a free water surface or on the side of a flowing water stream, the difficulties of transporting sample to the instrument are also avoided. Extensions to be described allow measurement also of water colour. PAY-PER-VIEW: Buy this article for £23.5 (IWA MEMBER PRICE: £17.63) - All prices include VAT |
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