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By Clemens C. W. Ruppel

A part of a suite of 14 studies of a variety of issues in acoustic wave expertise, geared toward the clinical viewers. positive aspects seven really good papers in all, discussing problems with observed units, from Green's services to instant observed sensor platforms.

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The second and third terms describe the linear shift due to the mechanical loading and the so-called energy storage effect, 44 ' 48 respectively. The energy storage effect is present also in periodic arrays of grooves, where the mass loading is absent and the first order effect is negligible. For aluminum electrodes in quartz, LiNbC>3 and LiTaC>3 both terms are usually negative. Table 2 gives some idea of the values, extracted 4 9 from rigorous simulations. When the velocity of the surface wave is much higher than that of bulk shear wave in the (thin) aluminum electrodes, the linear term in the expansion dominates, and the SAW velocity decreases almost linearly with increasing electrode thickness.

5°, for which the first order reflection coefficient vanishes. For the case of normal incidence (8 = 0), the result reduces to that in Eq. (77). 4. Transduction coefficient The normalized transduction coefficient, ap, measures the excitation of waves due to piezoelectric coupling in a unit cell of length Ao, which in the simplest case is formed by a pair of electrodes. It has the dimension of f 2 - 1 / 2 . For a very short transducer consisting only of one period, from Eq. (66) 13 +ia*, P 2 3 « -iap.

91) and y ( / ) = l c o M ( / ) + GBAw(/). (92) 35 68 Any appropriate step functions ' can be used to describe the onset and magnitude of scattering and BAW generation and, if necessary, the transition regions. For LSAWs on LiTaOs substrate the typical increase in attenuation is about 1 order of magnitude. If the aperture of an electrode structure is narrow, the transducer behaves as a waveguide. As far as equivalent counter-propagating modes are considered, there are no difficulties for the COM theory.

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