Polychromatic in-situ transmissometer for measurements of suspended particles and yellow substance in water

Hans Barth; Rainer Reuter; Uwe Stute

doi:10.1117/12.266372

6 February 1997 Polychromatic in-situ transmissometer for measurements of suspended particles and yellow substance in water

Hans Barth, Rainer Reuter, Uwe Stute

Author Affiliations +

Proceedings Volume 2963, Ocean Optics XIII; (1997) https://doi.org/10.1117/12.266372
Event: Ocean Optics XIII, 1996, Halifax, Nova Scotia, Canada

Abstract

Hydrographic conditions are often characterized by large amounts of dissolved and particulate matter. These substances influence the optical properties of seawater, and the radiative transfer in the water column. The attenuation coefficient is an optical parameter which depends sensitively on suspended and dissolved substances. An instrument has been developed for measuring spectral attenuation coefficients over a wavelength range form 370 to 730 nm. The optical path length can be set between zero and 400 nm, which allows an application in a wide range of turbidity. The variable path length enables a calibration of the instrument during in situ measurements, which makes it suitable for long-term applications where signals from conventional instruments would degrade due to biofouling of optical windows. From the data, the concentration and size distribution of suspended particles, and the concentration of dissolved organic matter are derived in real time. Algorithms based on Monte Carlo methods are available for a specific evaluation of non-chlorophylleous particles and phytoplankton. Results of field applications are reported.

Citation Download Citation

Hans Barth, Rainer Reuter, and Uwe Stute "Polychromatic in-situ transmissometer for measurements of suspended particles and yellow substance in water", Proc. SPIE 2963, Ocean Optics XIII, (6 February 1997); https://doi.org/10.1117/12.266372

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