Porous absorbers
"Sound becomes heat"
Simple explanation of porous absorbers:
Sound is absorbed by curtains, upholstered furniture or even acoustic panels. The sound energy is not lost in the process. It is converted into heat in the pores of the fabrics or acoustic materials. This is why these materials are also called "porous absorbers". They absorb the sound in the pores and convert it into heat.
The important thing here is that sound must be able to penetrate the pores. The surface of the acoustically effective porous absorbers must not be closed. Our natural acoustic panels are therefore coated with a fine layer of paint. In the process, the surface remains open-pored.
Precise definition of porous absorbers:
In a porous absorber, sound energy is converted into heat energy. The movement of the air particles in the pores generates friction. This friction generates heat. The friction of the air particles moving in the pores at a certain speed is also called dissipation or damping. The important thing here is that open pores must be of the right size for the sound energy to penetrate and the friction process to take place.
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