Reflection and Transmission at a Plane Screen with Periodically Arranged Circular or Elliptical Apertures.
STANFORD UNIV CALIF DEPT OF MATHEMATICS
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Theoretical estimates are given for the scattered acoustic wave amplitudes which result if a plane wave is incident on a perforated screen containing a periodic array of circular or elliptical apertures, on the twin assumptions that 1 the wave length greatly exceeds the aperture spacings and 2 the aperture dimensions are small compared to the spacings. The effect of a parallel backing plane is described and the impedance of a plane with a regular array of baffled pistons is calculated. Author