Acoustic Holography

Brüel & Kjær has long since been a pioneer in the field of acoustic holography offering solutions both for stationary and non-stationary sound fields.

Spatial Transformation of Sound Fields (STSF)

The name "Spatial Transformation of Sound Fields (STSF)" gives a good indication of the capabilities of the technique. Based on a measurement over a "scan plane" using a microphone array, or a robot positioned row of microphones, close to the sound source, the sound field can be calculated over parallel planes in the near-field region. The measured 2D sound field data can be "transformed" to other surfaces enabling a complete 3D description of the sound field. STSF can calculate any sound field descriptor such as sound pressure, sound intensity, or particle velocity as a function of position. Contribution analysis can be performed so that you can investigate the effects in the far field of changes to the sound source.

Non-stationary STSF
Non-stationary STSF can calculate any sound field descriptor such as sound pressure, sound intensity or particle velocity as a function of position and time. Results are typically displayed as animated maps to illustrate how a specific property changes as a function of time.

Further reading
For a deeper understanding of the theory, mathematics and implementation of STSF read "Nearfield Acoustic Holography (NAH) I - Theory of Generalised Holography and the Development of NAH", by JD Maynard, E.G. Williams and Y. Lee.

And

"Nearfield Acoustic Holography (NAH) II - Holographic Reconstruction Algorithms and Computer Implementation", by W.A. Veronesi and J.D. Maynard.

We help our customers measure and manage the quality of sound and vibration in their products and in the environment

Brüel & Kjær Sound & Vibration Measurement A/S. P +45 77 41 20 00. F +45 45 80 14 05. info@bksv.com
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