In-situ acoustic characterization of porous materials using a PU-probe
ABSTRACT
The PU probe technique allows in-situ surface impedance measurements of porous materials with minimal sample preparation and measurement setup. However, the in-situ condition comes at the cost of multiple additional factors, such as the measurement environment and probe positioning, which can influence the results if not properly addressed.
In this work, a sensitivity analysis is performed for two different materials, rockwool and melamine foam, with varying densities and sample thicknesses, aiming to provide a set of guidelines on how to perform measurements with the PU probe technique regarding sample size, methodology, and probe location. This technique is then compared with the current standardized procedures by converting all measured normal incidence sound absorption data into random incidence absorption coefficients of infinite lateral dimensions. Furthermore, the acoustically absorbent materials were inversely characterized using a minimization algorithm to estimate non-acoustical macroscopic parameters from the impedance gun and impedance tube normal incidence measurements. The results from both techniques were then compared with the macroscopic parameters determined with direct methodologies.
CITATION
Tejeda M.A.R, Mendes, P.A., Ribeiro, R.S., Pinto, P.T., (2023). In-situ acoustic characterization of porous materials using a pu-probe. In Proceedings of Tecniacústica, Cuenca, Spain.
Acoustic Material Testing
In-situ Sound Absorption testing