ISO 13472-1:2022 PDF

Scope: This document describes a test method for measuring in situ the sound absorption coefficient of road surfaces as a function of frequency in the range from 250 Hz to 4 kHz. Normal incidence is assumed. However, the test method can be applied at oblique incidence although with some limitations (see Annex F). The test method is intended for the following applications: — determination of the sound absorption properties of road surfaces in actual use; — comparison of sound absorption design specifications of road surfaces with actual performance data of the surface after completion of the construction work. The complex reflection factor can also be determined by this method.

ISO 13472-1:2022 Referenced Document

IEC 61672-1 Electroacoustics - Sound level meters - Part 1: Specifications
ISO 10534-1 Acoustics - Determination of sound absorption coefficient and impedance in impedance tubes - Part 1: Method using standing wave ratio
ISO 10534-2 Acoustics — Determination of acoustic properties in impedance tubes — Part 2: Two-microphone technique for normal sound absorption coefficient and normal surface impedance*， 2023-10-06 Update
ISO/IEC Guide 98-3 Uncertainty of measurement - Guide to the expression of uncertainty in measurement (GUM:1995). Extension to any number of output quantities

2022 ISO 13472-1:2022 Acoustics — Measurement of sound absorption properties of road surfaces in situ — Part 1: Extended surface method
2002 ISO 13472-1:2002 Acoustics - Measurement of sound absorption properties of road surfaces in situ - Part 1: Extended surface method