By Clemens C. W. Ruppel
A part of a suite of 14 reports of a variety of issues in acoustic wave expertise, geared toward the clinical viewers. gains 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
9. Dispersion curves with coinciding edges of the stopband. 139. 161. Dash-dotted curves: the approximate solution of Eq. (102), with parameters determined to give equivalent stopband edges. at the threshold A B , the reflected wave becomes entirely delocalized: it is converted into a bulk wave and radiated into the substrate. This results in pronounced attenuation of the incident wave. The frequencies with q = 0 may be identified as the edges of the stopband. The lower stopband edge occurs at frequency A_ = - i ( 7 ?
As the frequency approaches the bulk-wave threshold, a pronounced attenuation appears due to the scattering of the LSAW into BAWs, and the conductance (real part) increases because of synchronous BAW excitation. Extraction of the COM parameters from the admittance may be done in several ways, but basically the edges of the stopband yield the velocity and the reflectivity. The small oscillations in the conductance, visible in the expanded view, Fig. 11(6), may be used to determine possible additional dispersion of the velocity.
2 5 Careful analysis 94 of the COM equations shows that in a symmetric structure the stopbands for open and shorted gratings feature one coinciding edge, whereas in a unidirectional structure the stopband edges are separated from each other, see Fig. 13. Let / s c ± denote the edges of the stopband for shorted grating. Then, the velocity and the magnitude of the coupling coefficient may be found by inverting Eq. /«+ - /-cI K I 2p = 27T (118) JSC+ + /s< Subsequently, the magnitude of the transduction coefficient may be extracted from the difference between the centers of the stopbands, and the width of the opengrating stopband yields the degree of the unidirectionality # u n ; = 0T—26e.
Advances in surface acoustic wave technology, systems and applications. Vol. 2 by Clemens C. W. Ruppel