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For Sound hard wall, there is perfect specular reflection with no absorption of energy at the boundary. The condition corresponds to a reflection coefficient R = 1.
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For Reflection coefficient, enter a value for R (SI unit 1). The reflection coefficient is a complex valued quantity that can depend on the angle of incidence θi. The angle is defined through the built-in variable paas.theta.
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For Normal impedance, enter a value for the normal impedance Zn (SI unit: Pas/m). The reflection coefficient of the surface is computed according to the classical plane wave reflection expression
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For Absorption coefficient, enter a value for the (normal) absorption coefficient αn (SI unit: 1) and the phase φ (SI unit: rad). Both can depend on the angle of incidence in the same way as the reflection coefficient. The reflection coefficient of the surface is computed according to
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Angle dependency of the absorption or reflection coefficient can be introduced using the angle if incidence variable paas.theta or the cosine to the angle of incidence paas.costheta.
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