Sabin (unit)
In acoustics, the sabin (or more precisely the square foot sabin) is a unit of sound absorption, used for expressing the total effective absorption for the interior of a room. Sound absorption can be expressed in terms of the percentage of energy absorbed compared with the percentage reflected. It can also be expressed as a coefficient, with a value of 1.00 representing a material which absorbs 100% of the energy, and a value of 0.00 meaning all the sound is reflected.[1]
The concept of a unit for absorption was first suggested by American physicist Wallace Clement Sabine, the founder of the field of architectural acoustics. He defined the "open-window unit" as the absorption of 1 square foot (0.093 m2) of open window.[1] The unit was renamed the sabin after Sabine, and it is now defined as "the absorption due to unit area of a totally absorbent surface".[1]
Sabins may be calculated with either imperial or metric units. One square foot of 100% absorbing material has a value of one imperial sabin, and 1 square metre of 100% absorbing material has a value of one metric sabin.
The total absorption A in metric sabins for a room containing many types of surface is given by
Sabins are used in calculating the reverberation time of concert halls, lecture theatres, and recording studios.[2]
References[edit]
- ^ a b c Moore 1979, p. 35.
- ^ Davis & Davis 1975, p. 168.
Sources[edit]
- Davis, Don; Davis, Caroline (1975). Sound System Engineering (2nd ed.). Indianapolis: H. W. Sams. ISBN 978-0-672-21156-0.
- Moore, John Edwin (1979). Design for Good Acoustics and Noise Control. London: Macmillan. ISBN 978-03332-4-293-3.
External links[edit]
- Understanding sabins from NetWell Noise Control