Abstract
An automated accelerated aging test procedure is presented to estimate the lifetime of implant packages regarding hermeticity. Intruding humidity is captured automatically in packages at two elevated temperatures using a resonant circuit comprised of capacitive humidity sensor and coil in coupling with an external coil. Described are the test stand setup including sensor calibration and evaluation, data acquisition and processing. In a first application the safe and reliable operation of the setup is demonstrated.
Zusammenfassung
Es wird ein automatisiertes Testverfahren zur Durchführung von beschleunigten Alterungstests von Implantatgehäusen bzgl. Dichtigkeit vorgestellt. Eindringende Feuchtigkeit wird in Gehäusen bei zwei erhöhten Temperaturen automatisch erfasst. Hierzu dient ein Schwingkreis aus kapazitivem Feuchtesensor und Spule, gekoppelt mit einer externen Spule. Beschrieben werden der Aufbau des Teststands inklusive Sensorkalibrierung und -auswertung, Datenerfassung und -verarbeitung. In einer ersten Anwendung wird die sichere und zuverlässige Funktionsweise des Testverfahrens aufgezeigt.
About the authors
After studying mechanical engineering at Karlsruhe University Liane Koker did her doctorate at the Institute for Applied Computer Science of Karlsruhe Institute of Technology (KIT). The presented aging test procedure is a partial result of her dissertation. She is now a postdoc at KIT with research interests in system integration of active implants and printed materials and systems.
Karlsruhe Institute of Technology (KIT), Institute for Applied Computer Science, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
Jörg A. Nagel received his degree in mechanical engineering from the University of Karlsruhe in 2007 and the Ph.D. degree in mechanical engineering from Karlsruhe Institute of Technology (KIT) in 2011. Since 2015 he is working as senior expert for Industrie 4.0 applications at Pepperl+Fuchs GmbH.
Pepperl+Fuchs GmbH, Lilienthalstrasse 200, 68307 Mannheim, Germany
Studying Sensor Systems Technology at the University of Applied Sciences Karlsruhe Bernhard Schulz contributed to the development of the test stand as trainee at KIT. Now he works as development engineer in the logistics sector. His research interests lay in wireless sensor systems.
Network INGenieursgesellschaft mbH, Hohlohstr. 8, 75334 Straubenhardt, Germany
Fabian Ritter studied mechanical engineering at the Karlsruhe Institute of Technology (KIT) and contributed to the development of the test stand as working student. He now works at CreaTec Fischer & Co. GmbH. His fields of work are ultra-high vacuum components, MBE cells and STM-AFM plants.
CreaTec Fischer & Co. GmbH, Industriestr. 9, 74391 Erligheim, Germany
Stefan Vollmannshauser is an electrotechnician at the Institute for Applied Computer Science of Karlsruhe Institute of Technology (KIT) where he works since 2001. His fields of work are circuit design and development as well as mechanical design and construction.
Karlsruhe Institute of Technology (KIT), Institute for Applied Computer Science, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
Heino Besser studied physical technology at the RheinMain University and received his degree in 1991. Since 1992 he is working at the Institute for Applied Materials – Applied Material Physics (IAM–AWP) of Karlsruhe Institute of Technology (KIT) as engineer in the field of laser material processing.
Karlsruhe Institute of Technology (KIT), Institute for Applied Materials, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
Ulrich Gengenbach is head of the micro and nano systems research group at the Institute for Applied Computer Science of Karlsruhe Institute of Technology (KIT). Together with Helmut Guth he coordinated the project Artificial Accommodation System. Main fields of work: development of methods, processes and devices to integrate micro and nano systems.
Karlsruhe Institute of Technology (KIT), Institute for Applied Computer Science, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
Acknowledgement
The authors would like to thank the Helmholtz Association of German Research Centres (HGF) for supporting this work by program-oriented funding as well as the Karlsruhe Micro Nano Facility (KNMF) for the practical assistance. Special gratitude is owed to Prof. Georg Bretthauer for his kind supervision of this research. Further thanks go to the Ministry for Science and Art Baden-Württemberg for enabling the transfer of the acquired knowledge to following research activities within the scope of the Brigitte-Schlieben-Lange program (BSLP).
©2016 Walter de Gruyter Berlin/Boston