The Influence of Temperature on the Frequency Dependent Directivity of Ultrasonic Transducers - An Indirect Acquisition Technique

Conference contribution
(Conference Contribution)


Publication Details

Author(s): Ponschab M, Kiefer DA, Rupitsch S
Editor(s): ITG/GMA
Publisher: VDE Verlag GmbH
Publishing place: Offenbach
Publication year: 2018
Conference Proceedings Title: Sensoren und Messsysteme
Beiträge der 19. ITG/GMA-Fachtagung

Pages range: 430 - 433
ISBN: 978-3-8007-4683-5
Language: English


Abstract

Components of ultrasonic measurement devices suffer from exposition to
temperature fluctuations, which influence both the speed of sound in the
surrounding medium and the material properties of the ultrasonic
transducer itself. A consequence may be deviations of the frequency
response and the frequency dependent directivity pattern. This might
have an undesirable impact, for instance, on the accuracy of flow
metering devices. A conventional method for the determination of
radiation patterns of water-coupled ultrasonic transducers is the
scanning of the sound field with a hydrophone. Using this technique for
the purpose of measuring influences of temperature would be challenging
and time consuming. The required water basin, which represents a large
thermal capacity, must be kept on stepwise constant temperatures.
Furthermore, the hydrophone might not be designed for such conditions.
The approach presented in this contribution exploits an indirect
acquisition of the directivity. Instead of simulating the unknown
ultrasonic transducer setup the normal velocity of the transducer
surface is measured in air with a Laser-Scanning-Doppler-Vibrometer. In a
second step, the acquired normal velocity serves as excitation signal
for a finite-element simulation of the radiated sound field. The
influence of temperature on the transducer is studied by recording the
corresponding membrane vibrations while placing the transducer in a
climatic chamber. The temperature dependent speed of sound of water is
taken into account during simulation. For sake of validation, a
comparison to hydrophone measurements at room temperature reveals good
agreement of the frequency response at zero angle. The resulting
directional patterns also exhibit distinctive similarities.


FAU Authors / FAU Editors

Kiefer, Daniel A.
Lehrstuhl für Sensorik
Ponschab, Michael
Lehrstuhl für Sensorik
Rupitsch, Stefan PD Dr.
Lehrstuhl für Sensorik


How to cite

APA:
Ponschab, M., Kiefer, D.A., & Rupitsch, S. (2018). The Influence of Temperature on the Frequency Dependent Directivity of Ultrasonic Transducers - An Indirect Acquisition Technique. In ITG/GMA (Eds.), Sensoren und Messsysteme Beiträge der 19. ITG/GMA-Fachtagung (pp. 430 - 433). Nürnberg, DE: Offenbach: VDE Verlag GmbH.

MLA:
Ponschab, Michael, Daniel A. Kiefer, and Stefan Rupitsch. "The Influence of Temperature on the Frequency Dependent Directivity of Ultrasonic Transducers - An Indirect Acquisition Technique." Proceedings of the Sensors and Measuring Systems; 19th ITG/GMA-Symposium, Nürnberg Ed. ITG/GMA, Offenbach: VDE Verlag GmbH, 2018. 430 - 433.

BibTeX: 

Last updated on 2018-17-10 at 16:23