@inproceedings{13864, author = {{Bause, F. and Henning, Bernd}}, publisher = {{LibreCat University}}, title = {{{5.3.1 - Ein ultraschallbasiertes inverses Messverfahren zur Charakterisierung viskoelastischer Materialparameter von Polymeren}}}, doi = {{10.5162/SENSOREN2016/5.3.1}}, year = {{2016}}, } @inproceedings{13865, author = {{Ester, S. and Struschka, M. and Henning, Bernd}}, publisher = {{LibreCat University}}, title = {{{3.2.3 - Direktgravimetrischer Partikelmasse-Sensor zur quasikontinuierlichen Emissionsmessung}}}, doi = {{10.5162/SENSOREN2016/3.2.3}}, year = {{2016}}, } @inproceedings{13215, author = {{Moritzer, Elmar and Hüttner, Matthias and Henning, Bernd and Webersen, Manuel}}, location = {{Lyon}}, title = {{{An Approach to Non-Destructive Testing of Aged Polymers}}}, year = {{2016}}, } @article{13216, author = {{Moritzer, Elmar and Hüttner, Matthias and Henning, Bernd and Webersen, Manuel}}, journal = {{Kunststoffe}}, number = {{4}}, pages = {{94--96}}, title = {{{Molekularen Schäden auf der Spur}}}, year = {{2016}}, } @article{13217, author = {{Moritzer, Elmar and Hüttner, Matthias and Henning, Bernd and Webersen, Manuel}}, journal = {{Kunststoffe International}}, number = {{4}}, pages = {{43--45}}, title = {{{Detecting Molecular Damage}}}, year = {{2016}}, } @inproceedings{13218, author = {{Moritzer, Elmar and Hüttner, Matthias and Henning, Bernd and Webersen, Manuel}}, isbn = {{978-0-692-71961-9}}, location = {{Indianapolis}}, title = {{{Non-destructive characterization of hygrothermally aged polymers}}}, year = {{2016}}, } @inbook{13219, author = {{Moritzer, Elmar and Hüttner, Matthias and Henning, Bernd and Webersen, Manuel}}, booktitle = {{Jahresmagazin Kunststofftechnik 2016}}, pages = {{2--7}}, title = {{{Ultraschallbasierte Charakterisierung von gealterten Polymeren}}}, year = {{2016}}, } @inproceedings{13223, abstract = {{In der zerstörungsfreien Werkstoffprüfung sind bereits zahlreiche Verfahren etabliert, deren Ziel die Detektion makroskopischer Defekt- und Fehlstellen (z.B. Risse, Poren, Fremdeinschlüsse) ist. Insbesondere bei Polymerwerkstoffen muss jedoch auch die Materialalterung auf molekularer Ebene berücksichtigt werden, die sich (zumeist negativ) auf die Materialkenngrößen auswirkt. Gängige Verfahren zur Bestimmung dieser Kenngrößen arbeiten jedoch üblicherweise zerstörend und sind somit beispielsweise für die vorbeugende Instandhaltung oder die Online-Komponentenüberwachung nur eingeschränkt geeignet. In diesem Beitrag wird ein Verfahren zur zerstörungsfreien Charakterisierung des Alterungszustandes von Polymeren vorgestellt. Dazu wird der Zusammenhang zwischen akustisch (zerstörungsfrei, mittels Ultraschall-Transmissionsmessung) bestimmten Kenngrößen und klassisch (zerstörend, z.B. mittels Zugprüfung) bestimmten hydrothermischer Alterung auf das Material Polyamid 6 (PA6) untersucht. Die Ergebnisse Kenngrößen betrachtet. Exemplarisch werden die Auswirkungen zeigen einen engen Zusammenhang zwischen der zerstörend bestimmten Viskositätszahl, die ein Maß für die mittlere Molekülkettenlänge darstellt, und der akustischen Longitudinalwellengeschwindigkeit. Das Molekülkettenabbau (Depolymerisation) bestimmt ist, kann somit auch akustisch und zerstörungsfrei charakterisiert werden. Auf dieser Basis können neuartige, zerstörungsfrei arbeitende Messsysteme entwickelt werden.}}, author = {{Webersen, Manuel and Hüttner, Matthias and Bause, Fabian and Moritzer, Elmar and Henning, Bernd}}, isbn = {{978-3-9816876-0-6}}, location = {{Nürnberg}}, pages = {{683--688}}, title = {{{Zerstörungsfreie Charakterisierung des hydrothermischen Alterungsverhaltens von Polymeren}}}, doi = {{10.5162/sensoren2016/P6.4}}, year = {{2016}}, } @article{6555, author = {{Claes, Leander and Meyer, Thorsten and Bause, Fabian and Rautenberg, Jens and Henning, Bernd}}, issn = {{2194-878X}}, journal = {{Journal of Sensors and Sensor Systems}}, number = {{1}}, pages = {{187--196}}, title = {{{Determination of the material properties of polymers using laser-generated broadband ultrasound}}}, doi = {{10.5194/jsss-5-187-2016}}, volume = {{5}}, year = {{2016}}, } @article{13863, author = {{Olfert, Sergei and Henning, Bernd}}, journal = {{Technisches Messen}}, number = {{4}}, pages = {{219--224}}, title = {{{Erweiterung des Raman-Nath-Modells zur Analyse von Schlierenabbildungen}}}, doi = {{10.1515/teme-2015-0116}}, volume = {{83}}, year = {{2016}}, } @inproceedings{6554, author = {{Claes, Leander and Bause, Fabian and Rautenberg, Jens and Henning, Bernd}}, booktitle = {{Proceedings SENSOR 2015}}, keywords = {{piezoceramics, strip transducers, plate waveguide, dispersion diagram}}, pages = {{775--779}}, title = {{{Detection of ultrasonic plate waves using ceramic strip transducers}}}, doi = {{10.5162/sensor2015/P3.3}}, year = {{2015}}, } @misc{13866, author = {{Olfert, Sergei and Henning, Bernd}}, title = {{{Analyse integral erfasster rotationssymmetrischer Schallwechseldruckverteilungen in Schlierenabbildungen}}}, year = {{2015}}, } @inbook{13877, author = {{Olfert, Sergei and Henning, Bernd}}, booktitle = {{XXIX Messtechnisches Symposium}}, isbn = {{9783110408539}}, title = {{{Analyse integral erfasster Schallwechseldruckverteilungen in Schlierenabbildungen}}}, doi = {{10.1515/9783110408539-010}}, year = {{2015}}, } @inproceedings{13892, abstract = {{Several ultrasonic approaches for material determination are formulated in terms of an (nonlinear) inverse problem, e.g. immersion technique (Castaings et al. (2000)) or plate-waveguide techniques (Marzani et al. (2012)). In this contribution we focus on cylindrical waveguides for ultrasonic material determination and especially on the sensitivity of recorded transmission signals to the material properties. We utilize composite scaled sensitivities to determine the information content that can be achieved by the setup to certain parameters and discuss the limitations of the approach.}}, author = {{Bause, Fabian and Gravenkamp, Hauke and Rautenberg, Jens and Henning, Bernd}}, keywords = {{Sensitivity inverse problem ultrasonic material determination}}, pages = {{204--207}}, title = {{{Model based sensitivity analysis in the determination of viscoelastic material properties using transmission measurements through circular waveguides}}}, year = {{2015}}, } @article{13894, author = {{Bause, Fabian and Gravenkamp, Hauke and Rautenberg, Jens and Henning, Bernd}}, issn = {{0957-0233}}, journal = {{Measurement Science and Technology}}, title = {{{Transient modeling of ultrasonic guided waves in circular viscoelastic waveguides for inverse material characterization}}}, doi = {{10.1088/0957-0233/26/9/095602}}, year = {{2015}}, } @inproceedings{13897, abstract = {{This contribution will give a short introduction to the most important mechanic and acoustic parameters that are necessary to model and simulate frequency dependent sound propagation (dispersion) in isotropic but linear viscoelastic materials. Furthermore, several experimental techniques to measure these parameters will be discussed, like the dynamic-mechanical analysis and transient ultrasonic techniques. Finally it will be shown how to use the determined material parameters for the simulation of transient signals in a highly attenuative acoustic waveguide.}}, author = {{Rautenberg, Jens and Bause, Fabian and Henning, Bernd}}, booktitle = {{AMA~Conferences 2015}}, editor = {{Service GmbH}, AMA}}, pages = {{130--135}}, title = {{{Utilizing guided acoustic waves to measure dispersive material properties of polymers}}}, year = {{2015}}, } @misc{13220, author = {{Webersen, Manuel and Bause, Fabian and Henning, Bernd}}, title = {{{Application of Automatic Differentiation for the inverse parameter identification of complex-valued forward models}}}, year = {{2015}}, } @inproceedings{13222, abstract = {{When performing measurements, the effects of the measurement system itself on the measured data generally must be eliminated. Consequently, those effects, i.e. the system’s dynamic behavior, need to be known. For the piezo-composite transducers in an ultrasonic transmission line, a model based approach is used to describe their dynamic behavior and take into account its dependence on the environment temperature and the acoustic impedance of the target medium. Temperature-dependent model parameters are presented, which are obtained by performing a multiplepart identification process on the transducer model, based on electrical impedance measurements [1]. The identification process uses an inverse approach for optimizing a subset of the model parameters. Additionally, algorithmic differentiation methods are used to determine accurate derivatives. In a final optimization step, impedance measurements taken at different temperatures are used to determine the temperature dependencies of the model parameters. These can then be used to assess the plausibility of the identification results. Additionally, the parameters can be expressed as polynomials in the temperature to take different operating conditions into account.}}, author = {{Webersen, Manuel and Bause, Fabian and Rautenberg, Jens and Henning, Bernd}}, booktitle = {{AMA Conferences 2015}}, keywords = {{piezo-composite, transducer, temperature dependency, identification, plausibility}}, location = {{Nürnberg}}, pages = {{195--200}}, title = {{{Identification of temperature-dependent model parameters of ultrasonic piezo-composite transducers}}}, year = {{2015}}, } @misc{13224, author = {{Webersen, Manuel and Karzellek, Michael and Bause, Fabian and Henning, Bernd}}, title = {{{Implementation and uncertainty analysis of a test device for electrical impedance measurements using vector network analyzers}}}, year = {{2015}}, } @misc{13896, author = {{Olfert, Sergei and Henning, Bernd}}, isbn = {{978-3-939296-08-9}}, pages = {{1560--1561}}, publisher = {{Deutsche Gesellschaft für Akustik e.V}}, title = {{{Schallfeldcharakterisierung mittels Schlierentechnik}}}, year = {{2015}}, }