Sabine Absorption Coefficients of Aluminized Rubber
Case, Richard W.
Vahlkamp, Eugene W.
Kinsler, Lawrence E.
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Since 1930, the work of Eyring and others has indicated that the effective Sabine absorption coefficient of highly absorbing materials is not given by ai, the randomly incident energy absorption coefficient, but is instead given by -ln (1-ai). This indicates that for ai>0.63, the Sabine coefficient should be greater than 1.0. A search of the literature provides many measured values of 0.99 for the Sabine coefficient but rather surprisingly only one or two measured values in excess of 1.0. This paper reports on reverberation measurement made at frequencies from 10 to 100 kc/sec in water contained in a small tank completely lined with either flat or cone structured aluminized butyl rubber. The maximum value measured for the Sabine coefficient was 2.56 which corresponds to a2 =0.923. In carrying out these experiments, decay rates in excess of 25 000 dB/sec were measured through use of a Memoscope. Information as to the advantages of using a Memoscope in making reverberation measurements will be presented.
The article of record as published may be found at http://dx.doi.org/10.1121/1.2144006
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