Read e-book online Advances in surface acoustic wave technology, systems and PDF

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By Clemens C. W. Ruppel

ISBN-10: 9810245386

ISBN-13: 9789810245382

A part of a set of 14 reports of quite a lot of subject matters in acoustic wave expertise, geared toward the medical viewers. good points seven really good papers in all, discussing problems with observed units, from Green's features to instant observed sensor structures.

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Additional info for Advances in surface acoustic wave technology, systems and applications. Vol. 2

Example text

T h a t gives a relatively small but systematic error in velocity. This difference has also been observed based on numerical computations, and a correction constant c ~ 1 t o be included into the dispersion relation has been suggested 37 : q(A) = ±c^/(5STw(A)f - KR(A)KS(A). (114) Although the model takes into account the scattering of the surface waves into bulk waves, the agreement of the excitation characteristic of the surface waves is ' T h e exact solutions to the dispersion equation (97) may also be found.

Finally, in many cases the effects due t o bulk wave generation, appearing a t high frequencies, are relatively weak and manifest themselves only outside the passband. A few simple extensions 35 can be introduced into the COM model to further improve the agreement with the measurements. If the frequency range of interest is rather large, the wavelength A and thus, the relative dimensions of the structure do not remain the same. e frequency-dependent changes in the wave velocity and other COM parameters.

Radical changes of the model—the case of shear-horizontal surface waves. 3 . 1 . 1. Finger to the COM model resistivity The finite resistivity of the electrodes has an effect on the device response by 1) introducing losses via conversion of energy into heat, 2) leading to a nonuniform voltage along the device, 3) causing additional dispersion and 4) leading to nonuniform excitation distribution along the aperture. As discovered by Wright, 2 6 mechanisms 1-3 may be incorporated in the COM formalism via a straightforward substitution V _ V - , * £ > , <«> whereas the mechanism 4 must be taken into account by determining the values of the transduction coefficient a and resistance for unit length r appropriately.

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Advances in surface acoustic wave technology, systems and applications. Vol. 2 by Clemens C. W. Ruppel


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