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Sonocat - In-Situ Absorption Measurement in Room Acoustics - Case Study
Introduction
This document reports the in-situ sound absorption coefficients for different walls in the congregation hall of the Ernst-Christoffel-Haus in Monchengladbach-Rheydt. The measurements were performed in collaboration with Peutz Consult GmbH, Germany. The purpose of the measurements was to indicate how well the various surfaces absorb the sound in the room. The methods and measurement setup are presented in next section and the results are reported and compared in section 3. Finally, the conclusion is given in section 4 and some appendices are added in section 5.
Method and measurement setup
The in-situ sound absorption coefficients of different surfaces in the congregation hall of the Ernst-Christoffel-Haus in Monchengladbach-Rheydt have been measured on 08.11.2017 using the Sonocat (Figure 1). For these measurements the local plane wave (LPW) assumption is used to estimate the incident and reflected sound intensity from which the sound absorption coefficient is determined. The floor plan and surface projection of the congregation hall is shown in Figure 2 and some corner view pictures have been added to the appendix. An omnidirectional loudspeaker was positioned in the middle of the room emitting broadband noise. The walls, doors; facade and ceiling (as indicated in the floor plan) have been measured by performing small scan measurements, see Figure 3.