title: Measurement of the absorption coefficient of sound absorbing materials under a synthesized diffuse acoustic field.
abstract: This letter proposes an experimental method to estimate the absorption coefficient of sound absorbing materials under a synthesized diffuse acoustic field in free-field conditions. Comparisons are made between experiments conducted with this approach, the standard reverberant room method, and numerical simulations using the transfer matrix method. With a simple experimental setup and smaller samples than those required by standards, the results obtained with the proposed approach do not exhibit non-physical trends of the reverberant room method and provide absorption coefficients in good agreement with those obtained by simulations for a laterally infinite material.
authors.affiliation: Groupe d'Acoustique de l'Université de Sherbrooke, Université de Sherbrooke, Sherbrooke, Quebec J1K 2R1, Canada olivier.robin@usherbrooke.ca, alain.berry@usherbrooke.ca, olivier.doutres@usherbrooke.ca, noureddine.atalla@usherbrooke.ca.
authors.forename: Olivier
authors.initials: O
authors.lastname: Robin
authors.affiliation: Groupe d'Acoustique de l'Université de Sherbrooke, Université de Sherbrooke, Sherbrooke, Quebec J1K 2R1, Canada olivier.robin@usherbrooke.ca, alain.berry@usherbrooke.ca, olivier.doutres@usherbrooke.ca, noureddine.atalla@usherbrooke.ca.
authors.forename: Alain
authors.initials: A
authors.lastname: Berry
authors.affiliation: Groupe d'Acoustique de l'Université de Sherbrooke, Université de Sherbrooke, Sherbrooke, Quebec J1K 2R1, Canada olivier.robin@usherbrooke.ca, alain.berry@usherbrooke.ca, olivier.doutres@usherbrooke.ca, noureddine.atalla@usherbrooke.ca.
authors.forename: Olivier
authors.initials: O
authors.lastname: Doutres
authors.affiliation: Groupe d'Acoustique de l'Université de Sherbrooke, Université de Sherbrooke, Sherbrooke, Quebec J1K 2R1, Canada olivier.robin@usherbrooke.ca, alain.berry@usherbrooke.ca, olivier.doutres@usherbrooke.ca, noureddine.atalla@usherbrooke.ca.
authors.forename: Noureddine
authors.initials: N
authors.lastname: Atalla