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There are currently a number of measurement methods to characterize a road surface with regard to noise. This can be done by measuring the noise emission directly or indirectly via the parameters that are important for the noise emission.
Direct methods are:
- Statistical Pass-by (SPB)
- Close Proximity (CPX)
Indirect methods are:
The purpose of the texture measurement with the laser profilometer is to map the micro and macro texture of a road surface. The measuring method is laid down in the ISO standard 13473-1 / 2/3/4. With this measurement technique, a laser projects a beam of light at an angle on the road surface. A sensor captures the reflected light. The displacement of the light reflection on the sensor is a measure of the texture.
We have a 3D laser texture meter at our disposal.
The purpose of the in situ method is to determine the acoustic absorption of a screen on site in a fast, non-destructive manner. A sound wave is sent on the screen via a source. Due to the acoustic absorption, only a part of it will reflect. The absorption value is determined from the ratio between reflecting and incident sound.We have a Microflown system at our disposal.
Impedance tube method
The purpose of the absorption measurements with the Tube of Kunt is to determine the acoustic absorption of a sample. This method is laid down in ISO standard 10534-1 / 2. De Buis van Kunt is a laboratory instrument that can be used to determine the sound absorption of cores or test specimens produced in the lab.