Beamforming measurement process for mapping the relative sound pressure


Beamforming enables easy, one-shot measurement process for mapping the relative sound pressure and sound intensity contribution from a source. 

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Beamforming provides an acoustical map of noise sources by using an array of microphones to detect the direction of arrival of sound from the sources. The number of microphones in the microphone array system can vary from 18 to 144, and with an integrated camera you are able to see simple and intuitive measurement information in real-time.

Beamforming with Microphone Array

Beamforming is valid for medium to high frequencies (500 Hz to 20 kHz), and can be expanded with holography when used close to sources such as engines in a test cell.

Beamforming is often used to improve the spatial resolution, and it is well-suited for large objects such as vehicles in wind tunnels, where the array is placed relatively far from the source, outside the turbulent airflow.


Brüel & Kjær beamforming system is setup with measurement and post-processing software, a planar sliced wheel array of 18 microphones and our LAN-XI Data Acquisition System. This system setup is ideal for noise-source identification, troubleshooting investigations, Squeak and Rattle testing and industrial plant noise measurements.

The patented wideband holography in the Brüel & Kjær beamforming system can be used to measure over a very wide frequency range. And with the addition of a transient option enables averaging in the domains of time, RPM and angle, making it ideal for powertrain analysis.


Beamforming measurements on a superkart (Video)