In-situ absorption

Microflown Technologies offers a complete solution to measure the acoustic properties of materials with its In-situ absorption setup. This method is a true alternative for the well known Kundt's method or reverberant room method. Taking (destructive) samples is no longer required, and also the absorption of sound waves under oblique angles of incidence, as they occur in practice of course, can finally be tested. The system can even measure, next to material samples, complete assembled parts. Extremely high spatial resolution allows analysis of inhomogeneous, e.g. perforated, materials. As the in situ method also works with a relative movement between sample and probe, end of line control of materials has become possible. Curved materials can be measured, so the quality of the acoustic package as applied in the final assembly lines can be tested.

The impedance gun

With a small, handheld impedance gun the acoustic absorption, reflection or impedance can be measured in just a few minutes, broad banded, under normal and oblique angles.  With a sound source at 23cm from the probe the noise is generated towards the sample. The sound pressure and acoustic particle velocity are measured right on  the surface of the material.


  • Frequency range 20Hz - 10kHz
  • Fast method; short measurement and processing time
  • Low suscepebility to background noise and reflections
  • No need for anechoic room or anechoic conditions
  • Automatic synchronization of the measurements with the captured video data
  • High resolution mapping of:
    • Sound pressure
    • Particle velocity
    • Sound intensity
  • Absorption ( applicable in combination with the in-situ absorption setup )
  • Sound Power calculation
  • Frequency filtered playback of audio
  • Single sensor solution


Sound of Numbers Odeon Pemard

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