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Acoustic Imaging & Sound Visualization
Sound Localization Systems

Scan&Paint 2D


Scan&Paint 2D is a tool to visualize stationary sound fields with an unmatched spatial resolution in full acoustic bandwidth. The system is a superb engineering tool for troubleshooting, soundproofing or benchmarking all kinds of objects on the spot. It only takes a few minutes to complete and entire measurement campaign. Scanning results are translated into acoustic imaging by superimposed sound variations on a photograph of the measured object, allowing to localize the sound origin for either low, mid or high frequencies.


  • Broadband Solution: 20Hz - 10kHz
  • Fast & Easy, results in minutes
  • High resolution acoustic imaging of:
    · Particle velocity, Sound intensity & Sound pressure
    · Sound pressure contribution (with the TPA module)
    · Transmission loss coefficient (with the TL module)
    · Absorption coefficient (with Absorption module)
  • Applicable in (real) operating environments
  • Sound Power calculation
  • Reference sensor for phase correlation and ODS
  • Portable, single sensor solution


  • Noise source identification
  • Noise ranking
  • Vehicle acoustics
  • Component testing
  • Powertrain nvh
  • Troubleshooting
  • Soundproofing
  • Benchmarking

Sound localization using a single intensity PU probe

Sound source localization is an important topic in the field of sound & vibration, from product development stage till end of line quality control. The Scan & Paint 2D system is a portable, all-in-one box solution for acoustic measurements. It is a simple and unique tool, which will allow you visualize any stationary sound field in almost any measurement environment. Offering un matched spatial resolution in full acoustic bandwidth (20Hz to 10kHz). The method is very simple; the surface is scanned with one PU probe while a camera films the scanning. The recorded video and audio data are automatically synchronized. For each frame of the video the probes positions is extracted automatically by color marking recognition. Acoustic imaging results are produced by overlaying the captured acoustic variations over a photograph of the measured object, thus allowing to visualize the origin of noise.

Sound visualization, transmission loss and TPA with one testing system

A reference sensor can be added to preserve the relative phase of the measured particle velocity distribution. This feature enables the user to plot and study the dynamic behavior of samples (Operational deflection shapes). Furthermore, the capabilities of the Scan & Paint 2D system can be easily expanded thanks to additional software modules, like the Scan & Paint TPA or the Scan & Paint TL. The transfer path analysis module (TPA) will allow you to calculate and visualize the sound pressure contribution to an arbitrarily chosen reference point. The Transmission loss module (TL) is a tool specifically designed to allow using the Scan & Paint 2D system for in situ transmission loss measurements. Regardless of the purpose of your measurement, it will only take a few minutes to complete an entire Scan & Paint 2D measurement campaign.





The baseline software can be expanded with the following additional software modules:

  • TPA | Transfer Path Analysis
  • TL | Transmission Loss
  • AT | Advanced Tracking
  • The combination of a direct near-field particle velocity measurement along with a transfer path measurement, allows to calculate and visualize the sound pressure contribution to a certain listener point, thus providing a ranking of the noisiest areas of a cavity interior from the perspective of listener.

    A high velocity at the surface does not necessary mean a high pressure contribution to a certain position. In a complex environment such as a vehicle interior, the surface velocity can only give an indication about the source ranking of different areas. Traditionally transfer path analysis (TPA) offer a solution to rank sources but requires a multichannel frontend system with multiple sensors. An advanced version of the traditional Scan & Paint, called Scan & Paint TPA, is a solution for airborne TPA. This system introduces a fast method and requires a low number of channels. The Scan & Paint TPA not only maps the surfaces’ source strengths, but transfer functions and phase references as well. This opens the option to preserve relative phase information between various measurement positions and their contributions to a defined location. All this with only 3 channels (two sensors solution) and an omnidirectional sound sourcesor orientation.

  • The Transmission loss is an additional software module, which will allow you to use the system for in-situ transmission loss measurements. This new module provides means to visualize the sound transmission loss in a form of an easy to interpret color map.

    The measurement procedure is as easy as the Scan & Paint system itself. All you need to do, in order to determine the sound transmission loss across a partition or structure, is to position a volume velocity source in the vicinity of the area you wish to measure. Drive the sound source with broadband noise, and carry out a scan with a Microflown PU probe over the target area. Two scans need to be carried out. One of the scans is done from the emitter side of the studied area and the second one is done on the receiver side. Both scans are processed exactly in the same way as any other Scan & Paint measurement would be. In the post-processing stage, the transmission loss module would merge the two scans, calculating the local sound transmission loss by taking the ratio between the spatially averaged sound pressure in the emitting side and the sound intensity in the receiving side. Finally, the image of the measured area is overlaid with the resulting sound transmission loss colormap.

  • The advanced tracking system is a special upgrade dedicated for the Scan & Paint sound source localization solution. Thanks to this accessory, the process of locating the sensor on a camera image is much improved, thus reducing the total measurement time. All this is accomplished by using highly efficient light reflective markers coupled with latest advancements in LED technology.

    The new “Advanced tracking accessory” (ACC-S&P-TR) comprises of two parts: an active LED light, and two passive light reflectors installed directly on the probe. The camera accessory (LED’s) is slid on top of the camera body without obscuring the camera lens. Color adjustable LED’s illuminate the volume in front of the camera. The probe itself is equipped with up to two retro reflective markers. The reflective markers are designed to reflect only the light to which they are exposed to, thus making them very visible, and easy to track on the images recorded by the camera.