Acoustical scattering characteristics testing – Part 1: Measurement of random-incidence scattering coefficient in a reverberation room

Test of Sound-Scattering Properties – Part 1: Measurement of the Random-Incidence Scattering Coefficient in a Reverberation Room aiming at evaluatingthe sound quality of the room, providing reliable predictions about room acoustics; determining the properties of acoustic materials and calculating, simulating, and designing predictive models – for effective acoustic rooms.

Overview of Sound-Scattering Properties – Part 1: Measurement of the Random-Incidence Scattering Coefficient in a Reverberation Room

Test Name: Acoustics – Sound-scattering properties of surfaces – Part 1: Measurement of the random-incidence scattering coefficient in a reverberation room [1].

Test Method:

ISO 17497-1:2004: Acoustics – Sound-scattering properties of surfaces – Part 1: Measurement of the random-incidence scattering coefficient in a reverberation room [1].

Performed at: Laboratory, Institute of Acoustics Development & Application Materials (DASM).

1. Objectives & Test Objects

– Scope

This part of ISO 17497 specifies a method for measuring the random-incidence scattering coefficient of surfaces caused by surface roughness. The measurements are carried out in a reverberation room, either full-scale or on a physical scale model. The measurement results can be used to describe the degree to which sound is reflected from a surface other than specular reflection. The obtained results can be used for comparison purposes and for calculation and design related to room acoustics and noise control.

This method is not intended to describe the spatial homogeneity of scattering from a surface.

The degree of sound scattering from surfaces is very important in all aspects of room acoustics (e.g., in concert halls, recording studios, industrial halls, and reverberation chambers). Insufficient scattering can cause strong deviations from exponential sound pressure decay. On the other hand, an approximately diffuse sound field can be obtained with highly scattering surfaces in a room. The degree of scattering in a room can be an important factor related to the sound quality of the room.

The scattering coefficient is introduced as a new concept in this part of ISO 17497. Together with the sound absorption coefficient, the scattering coefficient will be useful in room acoustics calculations, simulations, and prediction models. For some time, it has been known that modeling scattering from surfaces is crucial to obtain reliable predictions of room acoustics. This part of ISO 17497 presents a measurement method to quantify the scattering characteristics of a surface to replace previously applied but generally non-accepted estimation methods.

The work has been coordinated with the Audio Engineering Society working group, AES SC-04-02 for Acoustic Material Characteristics. This group emphasizes the development of a measurement method for the directional diffusion coefficient, which differs from (but is related to) the random-incidence scattering coefficient. While the scattering coefficient is a preliminary measure describing the extent of scattered sound, the diffusion coefficient describes the directional uniformity of scattering; that is, the quality of the diffusing surface. Therefore, both concepts are needed and they have different applications.

– Test Object

Surfaces with roughness

2. Experimental Procedure

Steps to perform:

• Equip fully with devices, turntable, microphone, and test object.
• Perform sample measurement.
• Process and report results.

Role – importance of the Test of Sound-Scattering Properties – Part 1: Measurement of the Random-Incidence Scattering Coefficient in a Reverberation Room

The Test of Sound-Scattering Properties – Part 1: Measurement of the Random-Incidence Scattering Coefficient in a Reverberation Room performed by the Institute of Acoustics Development & Application Materials helps provide useful information, meeting all practical needs of customers and businesses wanting to:

• Obtain scientific grounds and bases to evaluate the sound quality of the room, providing reliable predictions about room acoustics.
• Determine the properties of acoustic materials: in this test, these are materials forming rough surfaces.
• Calculate, simulate, and design predictive models and effective acoustic rooms.

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Significance of acoustic testing services at DASM

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The Institute of Acoustics Development & Application Materials (DASM) is a pioneering, comprehensive, professional, and leading prestigious brand in Vietnam in the field of acoustics. On January 12, 2023, DASM was granted certificate No. 114/TĐC – HCHQ by the Directorate for Standards, Metrology and Quality (Ministry of Science and Technology), certifying registered multi-sector testing operations in the Mechanical-Physical field (registration number: 707/TN – TĐC).

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If you have a need to perform Material testing Acoustics – Measurement of sound scattering properties of surfaces in a room – Part 1: Measurement of random incidence scattering coefficient in a reverberation room, please contact us via Hotline for detailed consultation!