High level impedance tube

Description

The high sound level impedance tube, having a diameter of 29mm, is designed to measure the main acoustic indicators of a wide range of acoustic materials using 2, 3 or 4 microphone methods. In in situ configuration, it will be ideal for measuring the surface impedance of aeronautical liners or perforated plates and thus studying their non-linear behavior at high levels (155 dB).

Standards & certifications

  • ASTM E1050

  • ISO 10534-2

  • ASTM E2611

Main advantages

  • Frequency range: 300-6000 Hz

  • Portable - Method usable in the laboratory and in situ

  • Simple and user-friendly interface

  • Measurement method taken from the scientific literature including a sliding sine type excitation which improves the "sound signal to noise" ratio.

  • Top quality manufacturing

Applications

  • Analysis of the nonlinear acoustic response of materials;

  • Absorption measurement

  • Transmission measurement

  • Research and development

  • Comparative analysis

  • Quality control

  • Determination of the properties of open-cell porous materials by tube measurements and the use of FOAM-X software. The properties obtained are the open porosity, the resistivity to the passage of static air, the tortuosity, the viscous and thermal characteristic lengths and the static thermal permeability.

Included

  • An impedance and transmission tube with digital piston with thickness reading;

  • An adapter for In Situ testing;

  • Microphones;

  • A 4-input / 1-output acquisition system with integrated audio amplifier;

  • TUBE-X measurement software;

  • A verification sample;

  • A carrying case;

Properties measured

Absorption coefficient at normal incidence (α)

Complex reflection coefficient at normal incidence (R)

Normalized surface impedance (Zs/Zair)

2
mics

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Normal Incidence Attenuation Index (NSTL)

Normalized characteristic impedance (Z/Zair)

Wave number (k)

Dynamic Equivalent Density (peq)

Equivalent dynamic compressibility modulus (Keq)

Transfer matrix coefficients (Tij)

ASTM E1050 Standard

ISO 10534-2 Standard

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ASTM E2611 Standard

3
mics

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4
mics

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Accessories

  • Circular knives for porous materials

  • Porous material slicer

  • ENVIRO Station

  • Foam-X Software

  • Nova software

  • Resistive screen mount (44.44mm only)
    Square specimen holder for metamaterials (44.44mm only)

Documents