Anechoic chamber

To quantitatively and quantitatively analyze and record acoustic measurement quantities, reflection effects on the ceiling, floor and walls must be excluded as far as possible. Corresponding investigations take place in anechoic chambers and enable reproducible investigations that are independent of the acoustic boundary conditions.

The available anechoic room (see Figure 1) absorbs the airborne sound reaching the side walls, floor and ceiling almost completely from a cut-off frequency of 100 Hz and is therefore very well suited for free-field measurements. The room has a ventilation system to regulate the internal temperature. A net made of metal wires is installed above the floor absorber (see Fig. 2), on which the objects to be examined can be placed. In addition, there is another access option next to the main door so that measuring systems can also be used outside the sound measurement room.

Various measuring sensors (e.g. microphones) can also be set up using hooks on the ceiling.

Technical data
Manufacturer	Firma G + H, Berlin
Year	2001
Dimensions (W x L x H)	approx  4 m x 4 m x 4 m (64 m³)
Permissible floor load	approx  150 kg/m²
Lower cut-off frequency	100 Hz
Fig. 1	Fig. 2