@inproceedingsHenning_Rautenberg_Schröder_Unverzagt_2009, title=Ultrasonic Sensors for Process Applications - Sensor Design, booktitle=Proceedings Sensor 2009, author=Henning, Bernd and Rautenberg, Jens and Schröder, Andreas and Unverzagt, Carsten, year=2009, pages=47–52