Journal title RIVISTA ITALIANA DI ACUSTICA
Author/s Paolo Bonfiglio, Daniele Ponteggia, Andrea Farnetani
Online First 4/22/2026 Issue 2026/Online First
Language English Pages 9 P. 1-9 File size 0 KB
DOI 10.3280/riaof-2026oa21889
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Acoustic characterization of materials is crucial to evaluate their sound-absorbing properties under real conditions. Standard methods, such as the impedance tube (ISO 10534-2) and the re-verberation chamber (ISO 354), show limitations for in-situ measurements. This study presents an innovative approach to estimate the normal-incidence absorption coefficient using a low-cost 4×4 microphone array. The method computes normalized acoustic impedance and reflection coefficient from microphone pairs, with free-field calibration. The system covers 100 Hz-5000 Hz through variable spacers and reduces operational complexity compared to traditional techniques. Numerical valida-tion via finite element modelling and experimental tests in anechoic chamber show good agreement with analytical models and standards, with deviations comparable to the reproducibility of standardized methods. Results confirm the robustness of the approach against geometric variations and edge effects, enabling fast and reliable measurements in real environments.
Keywords: materials characterization, normal-incidence absorption coefficient, microphone array, acoustic impedance
Paolo Bonfiglio, Daniele Ponteggia, Andrea Farnetani, Preliminary analysis of an in-situ measurement systemfor normal-incidence absorption coefficient using a microphone array in "RIVISTA ITALIANA DI ACUSTICA" Online First/2026, pp 1-9, DOI: 10.3280/riaof-2026oa21889