Acoustic Imaging

Beamforming is a method of mapping noise sources by differentiating sound levels based upon the direction fromwhich they originate. The method is very quick, allowing a full map to be calculated from a single-shot measurement. It alsoworks at high frequencies.

The innovative Brüel & Kjær wheel arrays can be used with PULSE Beamforming to produce acoustically optimal resultswhile maintaining maximum ease of use and handling.

PULSE Beamforming software is centered around an easy-to-understand tree structure where all measurementsand calculations are represented. From there, drag-and-drop functionality allows you to plot results in both 2 and 3D. Inaddition, results can be superimposed on an image of the measured object.

Uses

PULSE Beamforming has the following primary uses:

• Noise-source location
• Mapping of noise radiated from medium- to large-sized objects such as vehicles, components and construction equipment
• Remote measurement in environments where it is difficult or dangerous to measure close to the source, for example, in wind-tunnels
• Mapping of higher frequencies than standard noise source location methods

Application Example

• Mapping of noise sources at the side of a helicopter
• Loudspeaker inside the cabin

• Quick overview within 30 sec.
• 1kHz - 6.4kHz frequency range

• Overall frequency range
• The three corners of the door stand out
• Highest sound pressure at the lower left corner