@articleHetkämper_Koch_Claes_Henning_2023, title=Phase-preserving methods to visualise ultrasonic fields with schlieren imaging, volume=90, DOI=10.1515/teme-2022-0112, number=2, journal=tm - Technisches Messen, publisher=Walter de Gruyter GmbH, author=Hetkämper, Tim and Koch, Kevin and Claes, Leander and Henning, Bernd, year=2023, pages=103–112 

@inproceedingsDreiling_Itner_Hetkämper_Birk_Gravenkamp_Henning_2023, place=Nürnberg, series=SMSI - Sensor and Measurement Science International, title=Improved determination of viscoelastic material parameters using a pulse-echo measurement setup, DOI=10.5162/SMSI2023/P59, booktitle=SMSI 2023 Conference, publisher=AMA Association For Sensors And Measurement, author=Dreiling, Dmitrij and Itner, Dominik and Hetkämper, Tim and Birk, Carolin and Gravenkamp, Hauke and Henning, Bernd, year=2023, pages=394–395, collection=SMSI - Sensor and Measurement Science International 

@inproceedingsHetkämper_Koch_Webersen_Claes_2023, title=Application-based learning of signal analysis methods with the help of a graphical open-source software, DOI=10.21427/159K-G445, booktitle=SEFI 51th Annual Conference Proceedings - Engineering Education for Sustainability, publisher=SEFI, author=Hetkämper, Tim and Koch, Kevin and Webersen, Manuel and Claes, Leander, year=2023 

@articleHetkämper_Claes_Henning_2023, title=Vorzeichenrichtige tomographische Rekonstruktion von Ultraschallfeldern mit Hilfe der Schlierentechnik, volume=90, DOI=10.1515/teme-2023-0069, number=, journal=tm - Technisches Messen, publisher=Walter de Gruyter GmbH, author=Hetkämper, Tim and Claes, Leander and Henning, Bernd, year=2023, pages=49–54 

@bookHetkämper_2022, place=Workshop “Messtechnische Anwendungen von Ultraschall”, Drübeck, title=Visualisierung von Ultraschallfeldern mittels Schlierentechnik und fraktionaler Fouriertransformation, author=Hetkämper, Tim, year=2022 

@inproceedingsHetkämper_Claes_Henning_2022, place=Berlin, Offenbach, title=Schlieren imaging with fractional Fourier transform to visualise ultrasonic fields, booktitle=Sensoren und Messsysteme - Beiträge der 21. ITG/GMA-Fachtagung, publisher=VDE Verlag GmbH, author=Hetkämper, Tim and Claes, Leander and Henning, Bernd, year=2022 

@articleClaes_Chatwell_Baumhögger_Hetkämper_Zeipert_Vrabec_Henning_2021, title=Measurement procedure for acoustic absorption and bulk viscosity of liquids, DOI=10.1016/j.measurement.2021.109919, number=109919, journal=Measurement, author=Claes, Leander and Chatwell, René Spencer and Baumhögger, Elmar and Hetkämper, Tim and Zeipert, Henning and Vrabec, Jadran and Henning, Bernd, year=2021 

@inproceedingsHetkämper_Dreiling_Claes_Henning_2021, title=Tomographie des Schallfelds von Ultraschallwandlern mittels Schlierentechnik, booktitle=Fortschritte der Akustik - DAGA 2021, author=Hetkämper, Tim and Dreiling, Dmitrij and Claes, Leander and Henning, Bernd, year=2021 

@inproceedingsHetkämper_Krumme_Dreiling_Claes_2020, title=A modular, scalable open-hardware platform for project-based laboratory courses in electrical engineering studies, booktitle=SEFI 48th Annual Conference Proceedings - Engaging Engineering Education, publisher=SEFI, author=Hetkämper, Tim and Krumme, Matthias and Dreiling, Dmitrij and Claes, Leander, year=2020, pages=1309–1313 

@articleClaes_Steidl_Hetkämper_Henning_2020, title=Estimation of acoustic wave non-linearity in ultrasonic measurement systems, DOI=10.48550/arXiv.2001.05708, journal=arXiv.org, publisher=Cornell University, author=Claes, Leander and Steidl, Carolin and Hetkämper, Tim and Henning, Bernd, year=2020 

@inproceedingsHetkämper_Claes_Henning_2019, title=Evolutionary algorithm for the design of passive electric matching networks for ultrasonic transducers, DOI=10.1121/2.0001110, booktitle=2019 International Congress on Ultrasonics, author=Hetkämper, Tim and Claes, Leander and Henning, Bernd, year=2019