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The fiberoptic measurement of the oxygen (O2) concentration is an important step towards a complete online recording of the ensiling process. This paper firstly explains the technology. Then, the methods and results of a first experiment are described, in which sugar beet pulp was ensiled in four tubes. These tubes were covered with two types of agricultural film (90 m, 200 m). During the ensiling process, the temperature, the pH value and the O2 concentration were recorded continuously in the silage. Furthermore the O2 concentration was measured online directly under the film. The first two measurands proved that ensiling took place properly and undisturbed. Measuring of the O2 concentration revealed a plausible course but some technical failures occurred.