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Feedback sine wave driver design for ultrasonic transducers

Published online by Cambridge University Press:  17 February 2009

P. Schweitzer ,
E. Tisserand ,
A. Hamed ,
J. Andréa  and
F. Coutard
P. Schweitzer*
Affiliation:
LIEN, University Henri Poincaré – Nancy 1, BP 239, 54506 Vandœuvre-Lès-Nancy, France
E. Tisserand
Affiliation:
LIEN, University Henri Poincaré – Nancy 1, BP 239, 54506 Vandœuvre-Lès-Nancy, France
A. Hamed
Affiliation:
LIEN, University Henri Poincaré – Nancy 1, BP 239, 54506 Vandœuvre-Lès-Nancy, France
J. Andréa
Affiliation:
LIEN, University Henri Poincaré – Nancy 1, BP 239, 54506 Vandœuvre-Lès-Nancy, France
F. Coutard
Affiliation:
LIEN, University Henri Poincaré – Nancy 1, BP 239, 54506 Vandœuvre-Lès-Nancy, France
*
[email protected]
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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® 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.

Keywords

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 47 , Issue 1: 4th Colloquium Interdisciplinary in Instrumentation (C2I 2007) , July 2009 , 12703
Copyright
© EDP Sciences, 2009

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References

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