ABSTRACT We derive the admittance of an aperiodic one-dimensional acoustic grating with acoustically matched boundaries using an enhanced δ-function model combined with the Green's function approach. The expression obtained is compared with the classical δ-function model and with electric back reflection measurements on a linearly chirped bulk acoustic grating with matched boundaries formed in LiNbO3 by domain inversion and excited in ``crossed-field'' scheme. The agreement between calculated and measured results is excellent.
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