Calculates color-coded sound maps on any plane parallel to the measurement plane. This uses any property of the sound-field such as sound pressure, sound intensity or particle velocity. Maintains source-separation capabilities at low frequencies.
Acoustic Holography - 8607
An acoustic holography system creates highly accurate sound maps using measurements made at multiple points next to the object. These use a hand-held microphone array, a fixed array, or a robot-controlled microphone array. With this method, many measurement points can be acquired simultaneously – saving time compared to traditional sound intensity methods.
The resulting maps show sound levels as colours emanating from the object’s sources. These sound maps can be laid over images and videos for easy relation to the test object. The software allows any relevant property of the soundfield to be calculated, such as source strength and directivity. Conformal noise mapping options allow measurements that follow the shape of the object, and using a set of patch measurements, you can then create animated, 3D noise maps on a 3D model of the object. Users can also listen to individual points during transient events.
Brüel & Kjær’s patented holography algorithm SONAH (statistically optimized nearfield acoustic holography) improves resolution over conventional NAH (near-field acoustic holography), and allows accurate mapping of objects with smaller microphone arrays that don’t cover the whole measurement object at one time. It also allows more arrays that are not rectangular, which gives more flexible array options such as combined arrays that also allow beamforming capabilities for higher frequencies and moving sources.
For more information on all of the extra options available including sound quality metrics calculations, transient measurements, panel contribution, intensity component analysis, in situ absorption, see Array acoustics options.
