Fraunhofer Institute for Building Physics IBP
Sound field visualization with microphone array
Acoustics
Nearfield acoustic holography for precise sound field visualization and sound source localization
With our rectangular microphone array, equipped with 88 ¼-inch microphones, we are setting new standards when it comes to measuring sound pressure levels. The array is part of a state-of-the-art Brüel & Kjær® system, combined with the powerful PULSE software, and enables detailed and reliable data acquisition and analysis.
We use nearfield acoustics holography to perform measurements in the frequency range from 800 Hz to 5 kHz. This technique is particularly effective for visualizing sound fields, localizing sound sources and identifying the cause of the noise. With the help of the nearfield hologram, weak points in sound transmission (sound insulation) and various sound sources can be visualized, localized and examined.
In addition, we have a range of other microphone arrays for more specialized measurements, which have varying geometries and numbers of microphones. Our acoustics experts will be happy to help you select the most suitable measuring equipment and method for your specific requirements.
Contact us directly to overcome your specific noise mapping challenges and noise troubleshooting problems with the latest technology and expertise.
| Measured variables | Sound radiation, directional characteristics, sound, sound particle velocity, sound intensity, sound power |
| Test objects | Machines, devices, tools, components, building services equipment, fans, vehicles |
Technical data
| Number of microphones | 96 (holography), 56 (beamforming) |
| Array geometry | Rectangular, round, logarithmic spiral |
| Distance between microphones | 30, 75, 150 mm (holography) |
Special features
| Nearfield acoustic holography | Analysis in the near field of sound sources, stationary and short-term noises |
| Beamforming | Analysis of farfield sound sources, stationary and moving measurement objects |
More Information
- Combined use with high-speed camera
- Laboratory and in-situ measurements
Rectangular microphone array with 88 ¼-inch microphones for measuring the sound pressure level.