Conveners
A16.02 Reliable Characterization of Acoustic Absorption, Reflection, and Scattering: P482
- Jonathan A. Hargreaves (Acoustics Innovation Institute)
- Marco Berzborn (Eindhoven University of Technology)
- Mรฉlanie Nolan (Universidad Politรฉcnica de Madrid)
A16.02 Reliable Characterization of Acoustic Absorption, Reflection, and Scattering: S114
- Jonathan A. Hargreaves (Acoustics Innovation Institute)
- Marco Berzborn (Eindhoven University of Technology)
- Mรฉlanie Nolan (Universidad Politรฉcnica de Madrid)
A16.02 Reliable Characterization of Acoustic Absorption, Reflection, and Scattering: S410
- Mรฉlanie Nolan (Universidad Politรฉcnica de Madrid)
- Marco Berzborn (Eindhoven University of Technology)
- Jonathan A. Hargreaves (Acoustics Innovation Institute)
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David Bosonin (Politecnico di Torino)09/09/2026, 09:00A16 Room Acoustics
While normal-incidence absorption can be measured with a simple impedance tube (ISO 10534-2), its random-incidence counterpart (ISO 354) assumes a level of infrastructure most university labs simply don't have. This paper first compares these two standardized methods with several non-standardized alternatives, weighing their accuracy, practicality, and cost in a summary table intended as a...
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Marco Berzborn (Eindhoven University of Technology)09/09/2026, 14:20A16 Room Acoustics
The measurement of Sabine's random incidence absorption coefficient as obtained from reverberation room measurements is well known to suffer from poor inter-laboratory reproducibility. This issue is often attributed to an insufficiently diffuse and distinctly non-uniformly dampened sound field within the laboratory, which are most prominent when the absorbing test specimen is mounted....
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Ziqi Chen (Rensselaer Polytechnic Institute)09/09/2026, 14:40A16 Room Acoustics
The three-microphone transfer function method has been a tube measurement method widely accepted for characteristic impedance and propagation coefficient of porous materials. When combined with the multiple-microphone method, the measurement frequency range can be extended to almost twice that of traditional measurements. However, discontinuities often emerge in the wavenumber spectrum at high...
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4395. Estimating Material Absorption Coefficients Using the Sound Field Scanning Method (FA2026/509)Antoine Decloux (Seven Bel GmbH)09/09/2026, 15:00A16 Room Acoustics
The characterization of sound absorption typically relies on standardized methods such as impedance tube measurements or reverberationย room testing, with associatedย sample size, mounting conditions, or test environment limitations. This paper investigates an alternative approach based on timeย and space resolved acoustic imaging of reflected sound fields.The proposed method uses a rotating...
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Jonas Heck (Institute for Hearing Technology and Acoustics)09/09/2026, 15:20A16 Room Acoustics
The two-microphone method, as defined in the standard ANSI/ASA S1.18-2018, is used to determine the acoustic impedance of ground surfaces. To derive the impedance from the sound pressure ratio of the two microphones, the method relies on a specific geometric relationship between the sound source and the two receiving microphones. Therefore, we explore the effect of positioning errors within...
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Jonas M. Schmid (Technical University of Munich)09/09/2026, 15:40A16 Room Acoustics
Accurate characterization of acoustic boundary properties is essential for reliable acoustic simulations, yet existing in situ methods remain limited by model assumptions, computational cost, and sensitivity to noise. In this work, a physics-informed neural operator framework is proposed for directly estimating the frequency-dependent acoustic surface admittance from near-field measurements of...
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Augusto Fantinelli (Human-Environment Research group, La Salle - URL)09/09/2026, 16:20A16 Room Acoustics
Modelling the interaction of sound waves with objects and surfaces is challenging due to the complex spaceโtime behaviour of acoustic fields. In practice, surface roughness and finite object dimensions cause sound reflections to deviate from ideal specular behaviour, producing scattered and diffracted fields. While separating the total sound field into incident, reflected, scattered, and...
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Louena Shtrepi (Politecnico di Torino)09/09/2026, 16:40A16 Room Acoustics
Additive manufacturing technologies enable the development of innovative and high-performance acoustic materials, allowing the design of complex structures. These fabrication techniques support a high degree of geometric customization that challenges the acoustic standardized characterization methods and their feasible application in the design process. One aspect that has been unexplored is...
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Anne Heimes (IHTA, RWTH Aachen University)09/09/2026, 17:00A16 Room Acoustics
In open spaces such as amphitheaters or open-air concert venues, surprisingly large reverberation times can be found, despite the absence of the ceiling and side walls. Previous research on Greek and Roman theaters showed that reflections between the stage building and the steps in the audience area determine the main components in the impulse responses. So far, such models have been based on...
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Matthias Blau (Jade Hochschule, IHA)09/09/2026, 17:20A16 Room Acoustics
For computational room acoustic models, a suitable characterization of boundaries is required. Yet, boundary conditions are often not accurately known.One possibility is to infer boundary impedance models from in-situ measurements using a comparatively simple measurement setup. Since measurement noise and modelling errors cannot be avoided, we formulate the estimation problem in a Bayesian...
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Arif Onur Yurek (Aalto University)09/09/2026, 17:40A16 Room Acoustics
In practice, the sound absorption of finite objects at grazing incidence is dominated by strong edge diffraction and non-local reaction. This paper proposes a 1D-microphone array method to separate incident, specularly reflected, and diffracted waves using the recently introduced boostlet transform. The method is inspired by classical ideas of separation via time-windowing and extended to a...
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