ACOUSTIC FABRICS ABSORB SOUND WAVES. NOTABLY CONTRIBUTES TO REDUCING NOISE IN A ROOM.
EN ISO 10534-2 defines a test method known as Kundt’s tube. It determines the sound absorption factor.
Sounds are produced by vibrations. Vibration speed or frequency is set in Hertz. One hertz (Hz) corresponds to one vibration per second. One kilohertz (kHz) corresponds to 1,000 vibrations per second and one megahertz (MHz) is 1 million vibrations per second.
The ear perceives sounds on a frequency scale ranging from about 16 hertz to 16,000 hertz. The higher the frequency, the more the sound is perceived as being high pitched by the human ear.
When a sound wave comes into contact with material, part of the energy of the wave is reflected, while the rest is absorbed. The sound-proofing quality of a room can thus be optimised using materials present in the space, and their acoustic absorption capacity.
Kundt's tube method
Sotexpro measures the absorption coefficient using Kundt’s tube method (EN ISO 10534-2).
The sample material to be characterised is subjected to a flat acoustic wave emitted by a loudspeaker.
The absorption coefficient and surface impedance (including resistance) of the material are derived from the transfer function between the pressures measured by microphones 1 and 2.
The properties of sound-absorbing fabric:
- Controls an ambient volume level in a room
Our blackout fabrics are particularly recommended for living areas, restaurant dining rooms, bedrooms, professional areas, meeting rooms, offices, etc.
Our sound-absorbing fabrics are also non-flammable (M1 fire rating).