ISO 10534-2 Acoustic - Determination of Sound Absorption Coefficient and Impedance in Impedance Tubes Test Standard

Material Testing

ISO 10534-2 Acoustic - Determination of Sound Absorption Coefficient and Impedance in Impedance Tubes Test Standard

The ISO 10534-2 standard, developed by the International Standards Organization (ISO), covers the use of an impedance tube, two microphone positions and a digital frequency analysis system to determine the sound absorption coefficient of sound absorbers for normal sound incidence. It can also be applied to determine the acoustic surface impedance or surface acceptance of sound absorbing materials. The measurements described in this test method are useful in basic research and product development, as they relate to the physical properties of a solid absorbent material, such as impedance ratios, airflow resistance, porosity, elasticity, and density.

ISO 10534-2 Acoustic - Determination of Sound Absorption Coefficient and Impedance in Impedance Tubes Test Standard

The test standard is similar to the test method specified in ISO 10534-1, with an impedance tube connected to one end with a sound source and a test specimen mounted to the tube at the other end. However, the measurement technique is different. In this test method, plane waves are generated in a tube by a noise source, and separation of the interference field is achieved by measuring acoustic pressures at two fixed positions using wall-mounted microphones or in-tube cross microphone, and the subsequent calculation of the complex acoustic transfer function, normal incidence absorption and impedance ratios of the acoustic material. . The test method is intended to provide an alternative and often much faster measurement technique compared to ISO 10534-1.

Compared to measuring the sound absorption in an echo chamber according to the method specified in ISO 354, there are some characteristic differences. The echo chamber method (under ideal conditions) will determine the sound absorption coefficient for diffuse sound incidence, and the method can be used to test materials with pronounced structures in the lateral and normal directions. However, the echo chamber method requires fairly large test samples, so it is not suitable for research and development studies where only small absorber samples are available. The impedance tube method is limited to parametric studies at normal incidence, but requires samples of the test object that are the same size as the cross-section of the impedance tube. For locally reactive materials, diffuse incidence sound absorption coefficients can be estimated from the measurement results obtained by the impedance tube method. It is used to convert test results from the impedance tube method (normal incidence) to propagation sound incidence.

Among the services provided by our organization within the framework of material testing services, there are also ISO 10534-2 standard tests.

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