An experimental investigation into the sound-scattering performance of wooden diffusers with different structures

An experimental investigation is performed to determine the random-incident scattering coefficients of wooden diffuser structures characterized by different materials, geometrical designs, groove depths and baffle features. In general, it is found that the reliability of the measurement results obtained using the ISO 17497-1 standard can be improved by inserting the test sample into the rotating turntable in order to reduce the edge effect. The experimental results show that a higher scattering coefficient is obtained when the diffuser is fitted with flutters, has a double-triangular upper-surface profile, and has a greater groove depth. The results and discussions presented in this study provide architectural acousticians with a useful framework for evaluating the sound-scattering performance of various wooden diffuser structures in indoor environments.