Resonator for sound absorption measurements of materials and constructions
The echo chamber for sound absorption measurements of materials and constructions is a standardized space that serves to determine the sound absorption coefficients of various materials and constructions, for example, suspended ceilings, hall chairs, anti-noise fences, etc., according to the SIST EN ISO 354 standard. The echo chamber has a volume of 201 m3, its internal border area is 210 m2. Diffusers with a (double-sided) area of 52 m2 are installed in the room and can be moved as desired. The maximum sample size for sound absorption measurements in the reverberation chamber is up to 12 m2. Brüel & Kjær type 2270 and 2260F modular precision sound analyzers, Brüel & Kjær type 4231 sound calibrator and Brüel & Kjær type 4292 L isotropic sound source are used for sound absorption measurements in the reverberation chamber.