Messung binaerer Diffusionskoeffizienten von Gasen in Wasser mit Hilfe der holographischen Interferometrie

The mass diffusion coefficient of gases in liquids is of high interest in deep diving technology, where divers have to be supplied with artificial breathing gases. Diffusion coefficients of oxygen, helium and nitrogen in pure water are determined at pressures up to 50 bar and temperatures between 10 and 30 C. The described measurement method is based on online holographic interferometric techiques. A digital imaging processing system is used to monitor the transient mass diffusion process. The measurement cell is developed to allow measurements over a wide temperature and pressure range. A new evaluation method is developed in which no initial and boundary conditions, not even any kind of calibaration are needed. The results which are able to be reproduced are compared with data from the literature. Good agreement is observed. (orig.)Available from TIB Hannover: RA 3251(95/E/55) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman