The use of wide-band transmittance imaging to size and classify suspended particulate matter in seawater

Davies, E.J.; Brandvik, P.J.; Leirvik, F.; Nepstad, R.

The use of wide-band transmittance imaging to size and classify suspended particulate matter in seawater

2017

Davies, E.J. | Brandvik, P.J. | Leirvik, F. | Nepstad, R.

An in situ particle imaging system for measurement of high concentrations of suspended particles ranging from 30μm to several mm in diameter, is presented. The system obtains quasi-silhouettes of particles suspended within an open-path sample volume of up to 5cm in length. Benchmarking against spherical standards and the LISST-100 show good agreement, providing confidence in measurements from the system when extending beyond the size, concentration and particle classification capabilities of the LISST-100. Particle-specific transmittance is used to classify particle type, independent of size and shape. This is applied to mixtures of oil droplets, gas bubbles and oil-coated gas bubbles, to provide independent measures of oil and gas size distributions, concentrations, and oil-gas ratios during simulated subsea releases. The system is also applied to in situ measurements of high concentrations of large mineral flocs surrounding a submarine mine tailings placement within a Norwegian Fjord.

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