One day… At the acoustic laboratory


Depending on their technical characteristics (format, thickness, shape, density, etc.), their perforation rates, and their machining shapes, all Obersound acoustic panels patterns offer different acoustic performances. Aspects such as the space between the ceiling tiles and the space above them (the plenum), the orientation of the panels and any spaces between them, have an influence on a space's acoustic qualities.
The acoustic performances of Obersound panels are expressed using perforation rates and average absorption coefficients.


How do you measure the absorption of Obersound panels?

The acoustic performance of Obersound panels consists in placing them in situ in a reverberation room in order to measure their influence on the acoustics of a space.


This calculation is ruled by the following standards:

- NF EN ISO 354 (2004): Measurement of sound absorption in a reverberation room
- NF EN ISO 11654 (1997): The weighted acoustic absorption index.

Through pictures and captions, we invite you to discover a standard day of Obersound acoustic panels testing at the Tarket Acoustic Laboratory (Laboratory with COFRAC accreditation No. 1-05756) in the town of Sedan.


In order to carry out an acoustic measurement, you have to place 12 m² of panels in situ in a dedicated space in such a way as to simulate (on the floor) a wall or ceiling fitting. This surface is contained by a periferal frame .

 

 In order to improve the effectiveness, the 12 m2 surface area is fitted with an acoustic insulator such as rock wool and/or felt. 

 Photo 1.jpg

Then the tiles can be laid.  

Photo 3.jpg

 When the mock-up is finished, a microphone fixed onto a rotating arm is set in place so that measurements can be taken from several position points. 

 Photo 4.jpg

Sound is emitted by 2 speakers and is recorded by the microphone.
A very sophisticated computer program compares the acoustic measurements of the empty room with those for the room with the Obersound panels in situ. The panels' influence is then calculated.

 

The test Cofrac report summarizes the conditions for carrying out the test: pose parameters of the tested product, equipment used and the results. They are expressed as:

 

  • Apha Sabine values ??according to the different frequencies. 
  • Apha W average

 

For more information:

http://www.acouphile.fr/index.html

http://www.dbstop.com/

http://www.bruit.fr/le-cidb/qui-sommes-nous-/

http://www.cstb.fr/le-cstb/equipements/acoustique/les-produits-testes/absorption-acoustique.html

 

 

Some examples of projects:

Finaltis

Banque Internationale

Tribunal de Montreuil