• Measurement kit for acoustical complex properties testing (3Mics_MAA)
  
• Measurement kit  for Transmission Loss testing (4Mics_MAA)
• Measurement kit for airflow resistivity testing (Resistivity_MAA)
  Measurement kit for open porosity testing (Porosity_MAA)
  
• Measurement kit for tortuosity testing (Tortuosity_MAA)
• Measurement kit for dynamic stiffness testing (Rigidity_MAA)
• Measurement kit for mechanical properties testing by means of a resonant method (Resonat_MAA)
• Measurement of sound absorption properties of road surfaces in situ Spot method for reflective surfaces (ISO 13472-2)
  

Measurement kit for airflow resistivity testing

Resistivity_MAA allows you to perform airflow resistivity measurements on porous materials according to the specifications of the standard UNI EN 29053:1994.

The system uses the  " alternating flow method" described by the standard, based on a flow of air with variable speed with sinusoidal law at a frequency of 2 H; the calculation of the speed of air flow and pressure drop at both sides of the material occur through the calculation of the rms value.

Parameters

Airflow resistivity according to  Standard UNI EN 29053:1994

Technical specifications
Tube diameter: 100 mm.
Measurement chain:

• 1 (1/2” ) microphone and preamplifier;
  
• 1 channels signal conditioner;
  
• National Instruments device or Audio sound card.
  
• Software developed in Labview®.