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One research focus is the characterization of fuel sprays using optical measurement techniques. Microscopic spray parameters (droplet diameter and droplet velocity) are as well a part of the measurement spectrum as the spray analysis as a whole. This serves to determine penetration depths, cone angles and other macroscopic spray parameters. Since fuel injections are fast processes, lasting only a few milliseconds, high-speed measurement techniques with up to 100,000 images per second are increasingly used for the investigation.