Visualisierung des Gasaustauschs an der windbewegten Wasseroberfläche mittels vertikaler Konzentrationsfelder von gelöstem Sauerstoff quer zur Windrichtung

A measuring technique for oxygen concentration fields is presented in this study. The technique is based on the method of laser induced-fluorescence (LIF). A fluorescent a water soluble ruthenium complex, which is dynamically quenched by oxygen, is used. In order to measure two dimensional fields, a lasersheet is created dynamically through a rotating polygon mirror wheel. With a spatial resolution of 43 µm and a recording frequency of 150 Hz it is possible to record fast processes within the mass boundary layerat the air-water interface. First measurements at a linear wind-wave facility show interesting events, which are presented in the form of videos. Calculation of mean concentration profiles out of the measured data provide results for the thinkness of the mass boundary layer and the transfer velocity in the estimated order of magnitude.