The acoustic characterization of porous media and its standards

While there is a growing number of methods for the acoustic or elastic characterization of porous material, there is only a few test procedures which are standardized.The benefits of using standards are to harmonize procedures and to reduce measurement uncertainties between laboratories. They should, moreover, give guidelines for accurate characterizations of materials and should clearly present the limits of the methods.Finally, they should keep the door open for the development of innovative techniques which apply to current materials or new materials not covered by the already existing standards.The context of this communication is the current revision of ISO 9053 standard (measurement of the static air flow resistivity) and the request for the revision of ISO 10534-2 (impedance tube measurements, 2 microphone technique). Therefore the objective is to collect comments and suggestions for these revisions and to share common views about the future standards.