Sensors & Probes
Sound Sources | VVS
Software | Velo
Fast & easy 2D sound visualization
The Scan & Paint 2D software offers a fast and easy solution for sound visualization of stationary sound fields. The audio and video data is recorded and synchronized, the auto-tracking of the position of the probe allow to extract very precise data from each frame of the video. After the scan is done you can quickly post-process the data using step by step tabs. High resolution mappings of sound pressure, particle velocity, sound intensity can be displayed and analysed using the many tools available to quantify, compare and rank the main noise sources.
Base module 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)
|Scan&Paint 2D | Base module||SW-S&P|
|In-situ transmission loss | Sub-module||SW-S&P-TL|
|Scan&Paint TPA | Sub-module||SW-S&P-TPA|
|Advanced Tracking | Sub-module||SW-S&P-TR|
- 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.