EDP Sciences Journals List
Home Document
Subscriber Authentication Point
Issue Eur. Phys. J. Appl. Phys.
Volume 47, Number 1, July 2009
4th Colloquium Interdisciplinary in Instrumentation (C2I)
Article Number 12703
Number of page(s) 7
Section 4th Colloquium Interdisciplinary in Instrumentation (C2I 2007)
DOI 10.1051/epjap:2008181
Published online 17 February 2009

Eur. Phys. J. Appl. Phys. 47, 12703 (2009)
DOI: 10.1051/epjap:2008181

Feedback sine wave driver design for ultrasonic transducers

P. Schweitzer, E. Tisserand, A. Hamed, J. Andréa and F. Coutard

LIEN, University Henri Poincaré – Nancy 1, BP 239, 54506 Vandœuvre-Lès-Nancy, France

Patrick.Schweitzer@lien.uhp-nancy.fr

Received: 28 May 2008 / Received in final form: 25 September 2008 / Accepted: 25 September 2008 / Published online: 17 February 2009

Abstract
The optimal sinusoidal excitation of an ultrasonic transducer requests a knowledge of the frequency and the impedance of the used ceramic. These parameters, that vary during the application, depend on the characteristics of the transducer but also on the acoustic load of the propagation medium. In the search for an adaptive excitation, we propose the design of a digital generator assuring the functions of automatic tuning and impedance matching. The design uses the Butterworth-Van Dycke model of pizoelectric ceramics. The method of determination and identification of the model parameters is presented and applied on three different transducers. The negative feedback of the generator is carried out by the signal measured on the transducers. The dynamic voltage being very variable, the output resistor of the driver is controlled by transducer impedance. This feedback control allows the stability of the output voltage to a constant value whatever the frequency and the medium is. A Simulink$^\circledR$ model of the regulation loop shows that the frequency tuning could be realized by exploiting the command signal of the driver resistance. The precision and the stability of the feedback system are tested for frequencies between 1 to 3 MHz.

PACS
43.38.Ew - Feedback transducers.
43.35.Yb - Ultrasonic instrumentation and measurement techniques.

© EDP Sciences 2009


What is OpenURL?

The OpenURL standard is a protocol for transmission of metadata describing the resource that you wish to access. An OpenURL link contains article metadata and directs it to the OpenURL server of your choice. The OpenURL server can provide access to the resource and also offer complementary services (specific search engine, export of references...). The OpenURL link can be generated by different means.
  • If your librarian has set up your subscription with an OpenURL resolver, OpenURL links appear automatically on the abstract pages.
  • You can define your own OpenURL resolver with your EDPS Account. In this case your choice will be given priority over that of your library.
  • You can use an add-on for your browser (Firefox or I.E.) to display OpenURL links on a page (see http://www.openly.com/openurlref/). You should disable this module if you wish to use the OpenURL server that you or your library have defined.