Beamforming

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

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The solution 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. The number of microphones in the array can vary from 18 to 144. An integrated camera provides simple and intuitive documentation. The refined beamforming technique can be used to improve the spatial resolution.

Acoustic beamforming using an array

Beamforming is valid for medium to high frequencies (500 Hz to 20 kHz). When used close to sources such as engines in a test cell, the patented wideband holography can be used to measure over a very wide frequency range. The addition of a transient option enables averaging in the domains of time, RPM and angle, making it ideal for powertrain analysis.

System suggestion

A basic PULSE beamforming system, including measurement and post-processing software, a planar sliced wheel array of 18 microphones and LAN-XI data acquisition hardware, is perfect for noise-source identification, troubleshooting investigations, Squeak and Rattle testing and industrial plant noise measurements. Based on one simple measurement, the system provides an acoustical map of noise sources by using the array of microphones to detect the direction of arrival of sound from the sources. The system can be expanded with holography.

Beamforming measurements on a superkart (Video)