Design Approach for an Advanced Multi-Channel Pyrometer for Bulk Oven Processes Rune Fritzsche, Clemens F. Kaiser, Georg Herdrich, Jürgen Grün and Tobias Grün EPJ Web Conf., 287 (2023) 09025 Published online: 18 October 2023 DOI: 10.1051/epjconf/202328709025