Sound absorption coefficient measurement
CEVAA measures the sound absorption properties of materials. Improve the acoustic comfort and sound quality of your product or premises!
Measurement of sound absorption of materials
CEVAA assists you in characterizing the sound absorption properties of materials. This measurement is crucial for assessing their ability to absorb sound waves and thus reduce reverberation and noise in a space. It quantifies a material’s effectiveness in transforming sound energy into another form of energy, usually thermal.
By knowing the absorption properties of materials, manufacturers can make informed choices to optimize sound quality. Finally, these measurements help ensure compliance with current acoustic standards.
Absorption tests and measurements with impedance tube and alpha cabin
The CEVAA uses impedance tube to measure the absorption coefficient of a material, under normal incidence, in a simple, fast and perfectly reproducible way. Additionally, testing procedures meet ISO-10534 and ASTM E-1050-98 standards. We have tubes with an internal diameter of 29 mm, 44 mm and 100 mm. They cover a wide band of frequencies between 50 and 6300 Hz.
The CEVAA also has an Alpha Cabin with a volume of 6.44 m3. We thus perform measurements of the acoustic absorption coefficient in diffuse fields.
Associated services
Sound absorption coefficient
Sound waves are not always completely reflected by obstacles. Depending on the frequency of the incident wave and the characteristics of the materials, the obstacles absorb a greater or lesser quantity of energy.
By choosing materials according to their absorption coefficient, it is possible to correct the acoustic behavior of a room, an enclosure or even a vehicle passenger compartment.
The thickness of the material also plays an essential role: while a light veil is generally sufficient to absorb the high-pitched extremes and prevent them from being reflected, several meters of thickness may be necessary to absorb signals with frequencies below 50 Hz.
The absorption coefficient α of a material is the ratio:
α is a dimensionless number. It depends on the nature of the material and the frequency of the incident wave on the wall.
– If α is equal to 1, this means that the wall has absorbed all the energy and nothing is reflected: the material is absorbent.
– If α is equal to 0, this means that the wall has reflected all the energy and nothing is absorbed: the material is reverberant.
Materials characterization benches
Small cabin
Alpha cabin
Impedance tubes
Oberst method
Dynamic stiffness bench
S&R bench
Poisson's ratio bench
DMA
For more information, contact our teams!