sound absorption coefficient

a [metric sabin per square meter, often omitted or treated as dimensionless]. Of a surface with a given plan area and aspect ratio, the ratio of Sabine absorption of a surface to the plan area of the surface, áI=Ai/Si.

Note that the absorption footprint of the surface is not obliged to be smaller than its plan area, resulting at times in sound absorption coefficients greater than 1.00. This diffraction effect is most noticeable for small plan areas, where strong sound absorption and long wavelength occur. The sound absorption coefficient increases generally with increasing absorber thickness and with increasing frequency.

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Measurement of Sound Absorption

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