www.davidson.com.au - Microflown Sound Pressure & Particle Velocity Sensors

The traditional methods for characterising the acoustical properties of damping materials under normal and oblique angle of incidence are time consuming measurements, require dedicated laboratory infrastructure.
The normal angle of incidence as measured in the Kundt’s tube is destructive for the sample, limited in bandwidth and the results are dependent on the skills of fixing the samples properly in the tube.
The oblique method requires very large samples, long measurement times and complicated algorithms.

These methods are all based upon pressure transducers.

The availability of the Microflown, a dedicated acoustical particle velocity sensor, and combining it with a miniature pressure transducer, has resulted in a fully integrated and broad banded 1D p-u based sound probe.

Using this technology offers numerous advantages:

In situ measurements
Allow online process control during manufacturing
Without standing wave tube / laboratory infrastructure
Under normal and oblique angles of incidence
Truly broad banded up to 20 kHz and above
Extremely fast measurement times
No complex mathematics

Literature

Application note: P-U based in situ characterization of damping materials

R. Lanoye et al., A practical device to determine the reflection coefficient of acoustic materials in-situ based on a Microflown and microphone sensor, ISMA 2004 Leuven, Belgium

De Bree et al., In situ, broad band method to determine the normal and oblique reflection coefficient of acoustic materials, SAE Traverse city, 2005

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