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Software | Velo

Acoustic Camera

Non-stationary noise source identification and ranking

The Near Field Acoustic Camera allows localization and real-time analysis of non-stationary noises such as squeaks, rattles and clicks. Unlike traditional techniques, the array of sensors does not only capture sound pressure, but the Near Field Acoustic Camera measures also directly the particle velocity. Hence, the Near Field Acoustic Camera yields an accurate particle velocity map in the full audible frequency range, while maintaining a dynamic range and an unmatched spatial resolution.

Data output

  • Narrowband or Octave bands analysis
  • Sound pressure maps & spectra
  • Particle velocity maps & spectra
  • Sound intensity maps & spectra
  • Coherence maps & spectra
  • Sound power spectra
  • Spectrograms of all channels
  • 2 extra reference channels (cross-maps & spectra)
  • Audio and video playback and exporting

Software Modules

Software Product Code
Acoustic Camera | Base module SW-AC
Near-Field Acoustic Holography | Sub-module SW-AC-NAH
Order Tracking | Sub-module SW-AC-RPM
  • NAH | Near Field Acoustic Holography
  • There is an optional second processing method, next to the standard DSV, which is based on the Near Field Acoustic Holography (NAH). The NAH allows for finer interpolation and greater resolution in the obtained sound field visualizations. Furthermore, the NAH method allows for the extension of the measured plane. Thanks to this feature, the sound field can be calculated closer, or further away from the actual measured plane. Both methods can display absolute values for sound pressure, particle velocity, sound intensity, or sound power. The Acoustic Camera array, thanks the presence of two sound field visualisation techniques, can be used either as a planar array, or a scattered array with sensors positioned randomly around the surface of the studied noise source. This feature has significant consequences for how the equipment can be utilised. If you require a quick measurement, then a planar array coupled with the NAH processing will deliver the best results in a short time frame. However if you need a detailed examination of a complex problem in a noisy environment, then positing your sensor close to the measured surface, while using the DSV processing, would yield the best results.

  • The system is equipped with an extensive order analysis module. It allows to track the rotational orders both with and without a tacho sensor.The Order Tracking Module is a perfect tool for studying rotating machinery, as it allows to analyze the frequency content of a signal with respect to the speed of rotation. What makes this module unique is the capability to extract the rotational orders without the necessity to record the RPM signal. Order extraction is done with just a few mouse clicks. You only need to define and highlight a known order in the spectrogram of a recorded sound signal. An efficient algorithm will then track the order and translate it into a tacho signal. The tacho signal synthesized this way, can now be used to determine the distribution of any other orders of your choice, in a simple and easy to understand ordergram.

  • Thanks to the unique features of the Microflown sensor, sound power measurements can now be done in-situ and in acoustically challanging environments. The Acoustic Camera is equiped with PU probes. Each probe measures sound pressure and particle velocity at the same point in time and space. Sound intensity is calculated by taking the time averaged product of both quantities. If the measured area is known, the software can visualize the distribution of sound power in realtime in a broad frquency range (20 Hz - 10 kHz). Furthermore the unique properties of particle velocity reduce the requirements for the acoustic treatment of the measurement environment. Accurate sound power results can now be obtained in-situ, or in industrial manufacturing environments. Benchmarking and quality control has never been easier.

    > Click here to read more on sound power measurements