Mecanum - Noise Control Services

Impedance tubes

The Mecanum's impedance tubes are specifically designed to measure the main normal indicators of a wide range of acoustical materials. The method is based on ASTM E1050 and ISO 10534-2 standards.

Material properties

normal incidence sound absorption coefficient α; normal incidence complex reflection coefficient R; normal surface impedance Z; normal incidence sound transmission loss TL; characteristic impedance Z; wave number k

Applications

Benchmarking, quality control and R&D applications. Impedance tube measurements are used by Foam-X for the inverse characterization of poroelastic material properties such as open porosity, static airflow resistivity, tortuosity, viscous and thermal characteristic lengths, and static thermal permeability.

Features

Standard Mecanum's impedance tube system includes a 44.5-mm medium diameter impedance tube to cover the 100-4100 Hz frequency range, a DAQ system, the software Tube-X, and a verification sample used to check the measurement procedure. Tube-X software fully controls the measurement procedure from the calibration to the measurement itself. It corrects for atmospheric conditions and tube's internal dissipation. Small and Large tubes are also available to cover respectively the 50-1600 Hz and the 500-6000 Hz frequency range.

Other Mecanum's related products

- Transmission tube extensions for transmission loss measurements

- Portable high level (up to 160 dB)