Acoustics - Absorption coefficient

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The absorption coefficient of a material indicates the ratio between the absorbed and the received acoustic energy. So, when the coefficient is 1, it means that the absorbed energy is equal to the received energy, or in other words, that all the received energy has been absorbed. When, vice versa, the coefficient is 0, it means that the acoustic energy has been completely reflected. To measure the absorption coefficient of a material, we'd place it inside a room whose original RT60 value is known. Next we'd remeasure the RT60 of the room and then, using the Sabine equation, we'd find the absorption coefficient of the material in question.








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