showed reliable results for all relevant biogas components for varying concentration ranges from ppm to 100 vol%. The response time of 5 seconds allows online detection and - as a consequence - real time information is obtained about the biogas composition. A laboratory biogas reactor was designed to operate biogas production on a miniaturized scale and analyze it using the Raman gas sensor. The developed sensor enables the observation of methane production throughout the first 24 h of the fermentation process. The obtained results show the suitability of cavity enhanced Raman spectroscopy as a gas sensor to monitor the entire process of biogas production. As this strategy would allow the process to be manipulated and optimized according to the current state, it is of great biotechnological interest.
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Sieburg et al. (2018) studied this question.
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