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In-Situ Absorption
Sound Velocity Sensors / insitu
Scan & Listen
3273A_DYTRAN Precision transducers for Research & Development
In-Situ Absorption Setup

In-Situ Absorption

Microflown offers a complete solution to measure your material properties with the In-situ absorption setup. With a small, hand held impedance gun the acoustic absorption, reflection or impedance can be measured in just a few minutes, broad banded, under normal and oblique angles.

This in situ absorption method is a true alternative for the well known Kundt’s method or reverberant room method. With a sound source at 23cm from the probe noise is generated towards the sample.

The sound pressure and acoustic particle velocity are measured right at the surface of the material. 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.

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, the end of line manufacturing control of damping materials has become possible. As the method also works on curved materials, also the quality of the acoustic package as applied in the final assembly lines can be tested.

Can be used for product development and end of line control before and after assembly.


  • In-situ method
  • Normal & oblique angles of incidence
  • Frequency range 300 Hz – 10 kHz
  • Flat & curved surfaces
  • Homogeneous & inhomogeneous materials
  • Fixed and moving surfaces

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