J. Assaad et al., INFLUENCE OF THE THICKNESS AND THE ATTENUATION COEFFICIENT OF A BACKING ON THE RESPONSE OF TRANSDUCERS, Ultrasonics, 34(2-5), 1996, pp. 103-106
Citations number
4
Categorie Soggetti
Acoustics,"Radiology,Nuclear Medicine & Medical Imaging
In this paper, the characteristic mechanical. impedance of an absorbin
g medium (backing) is expressed in terms of its thickness T-B and the
tangent of the phase angle (tan delta = m, delta is the loss angle). I
n fact, the backing has been considered as a lossy transmission line.
Then, using the model of Mason's circuit, the electrical impedance and
radiated power of an in-air backed transducer will be expressed in te
rms of tan delta and T-B. It is shown that the characteristics of such
transducers do not change if the thickness is scaled down and the pro
duct mT(B) stays constant. The same properties have been obtained for
backed transducer bars using a finite element method (FEM) analysis.