Impedance tube for measuring the
sound absorption properties of road surfaces
SW420R is designed according to ISO 13472, so that a method of measuring the sound absorption properties of road surfaces can be carried out on site with impedance tube.
This method allows the sound absorption characteristics to be evaluated without damaging the surface.
The test results can also be used to qualify the absorption properties according to ISO 362 and ISO 18044.
The use of SW420R and the algorithm is the same as described in ISO 10534 (equivalent to GB/T 18696), VA-Lab IMP module can be used directly with this product.