Matelys has been awarded the "Gold Decibel 2011" in category "Research" by the French National Council for Noise (CNB): http://www.developpement-durable.gouv.fr (in French). The characterization is part of our research.

Characterizations

Matelys has access to a complete set of exprimental setups for the acoustic characterization of porous materials: a porosity measurement setup, a resistivity measurement setup in accordance with ISO 9053 standard (method A), five impedance tubes (or Kundt tubes) operated according to ISO 10534-2 standard. These tubes are selected depending on the size of the materials samples or depending on the frequency ranges studied:

Matelys also has access to experimental setups for the characterization of elastic parameters of porous materials. One of these setups follows the ASTM E756 standard.

ENTPE Large tube: Kundt tube made of concrete with a 600 mm x 600 mm inner square cross section. Length of the tube: 5.5 m. This tube is used for sound absorption measurements of large samples like absorbing wedges of anechoic rooms, ceiling perforated panels...

ENTPE small and medium tubes allow estimation of the dynamic density and bulk modulus of acoustic materials with only three acoustic pressure measurements..

Bruel & Kjaer tube 4106T with a transmission loss kit.

Measures

Test rooms

Matelys has access to 3 rooms for sound absorption or transmission measurements. Two of these rooms are reverberant. They can be coupled together for transmission loss measurements. The last room is a semi-anechoic chamber, which can be coupled with one of the reveberant rooms for insertion loss measurements.
These rooms are too small for certification tests. They are used for development tests only.

First reverberant room (3.50 x 7.00 x 2.50 cubic meters). A double glass window is under transmission loss measurements.

Semi-anechoic room (2.00 x 3.65 x 2.00 cubic meters). An automotive component is under insertion loss measurements.

Transducers

Matelys can use a complete set of transducers to realize specific experimental studies in the fields of acoustics and vibrations: