Alpha Cabin (small)
Alpha cabins have been designed for determining the acoustic absorption properties within limited space capacities. They have non-orthogonal internal walls but also speakers that constitute emission sources. Their special geometry makes it possible to limit the influence of resonant modes to obtain a diffuse field within the cabin.
Its small size (approximately 6m3) and low cost make it an accessible means of testing the absorption of all types of materials.
These cabins are particularly popular in the automotive industry and, more broadly, sectors involved in mechanics and the integration of acoustic components.
Our Alpha cabins are sized according to:
- The size of the sample or piece to be tested
- The specificities of the installation location and handling
- The type of data to collect, frequency range
- The isolation against external noise
We provide our cabins with the apparatus and commissioning instructions. This enables you to use it in accordance with specific test standards.
Reverberation room (large)
Reverberation rooms are used to determine two specific acoustic properties:
- The sound power output generated by a Lw device
- The sound absorption of a material
A well-constructed room should be based first and foremost on sound isolation against external noise. Like the Alpha cabin, the design of the walls, ceiling and floor is not orthogonal to prevent standing waves forming in the room. Additional forms and panels make it possible to generate wave reflections in the corners of the room. Once constructed, the reverberation time of the room is determined. Ideally, this reverberation time should be homogeneous in the whole of the room
Before starting the design phase, our reverberating rooms are calculated using beam forming software which simulates reverberation. A large room makes it possible to obtain a diffuse field over lower frequencies.
Sound power is measured by placing the item to be tested in the centre of the room. Sound absorption is measured by positioning the material to be tested on one of the inner surfaces of the room, ideally the floor.