The Scan & Paint 3D is designed to facilitate the capabilities of the Microflown USP sensor – The Ultimate Sound Probe. The USP sensor is an acoustic vector sensor which allows for the determination of the 3D sound intensity vector, or 3D particle velocity vector. The USP probe comprises of four transducers, one sound pressure microphone and three orthogonally placed particle velocity sensors. Each velocity sensor is measuring the particle velocity along a specific axis (X, Y and Z axis), thus enabling its users to characterize the sound field in the full three dimensional space.
The measurement principle behind the Scan & Paint 3D is based on a scanning technique. If the sound field under investigation is stationary over time, or can be treated as stationary, then using only one USP probe, in just a few minutes, you can obtain a visual distribution of the sound field produced by the object under test. Throughout the measurement, the USP probe is being swept around the volume surrounding the measured object. Both the position and orientation of the probe within the volume need to be closely monitored, in order to obtain an accurate result. This task is carried out by a smart optical tracking system.
The tracking system is based on monitoring a defined measurement space using a Stereo camera. Each camera is equipped with an infrared (IR) pass filter in front of the lens, and a ring of IR LEDs around the lens, to periodically illuminate the measurement space with IR light. Around the probe a spherical structure is integrated. This structure is equipped with retro-reflective markers, which reflect the incoming IR light back to the cameras. These reflections are detected by the cameras, and the internal processing of the tracking system translates them into 3D probe coordinates. If the camera is not able to capture the entire required volume, you can always reposition it, and continue your measurement from where you finished previously.
- Broadband Solution (20 Hz – 10 KHz)
- Fast Method | short setup, measurement and processing time
- 3D visualisation of:
- Sound intensity vectors
- Particle velocity vectors
- Applicable in (real) operating environments;
- Automatic 3D tracking of the sensor position and orientation
- 3D Model to have a fast 3D visualisation
- 2D visualisation option available for all angles of the 3D model
- Easy to operate
- Single sensor solution
The Microflown PU-based Near Field Acoustic Camera is a very fast and accurate system for sound source localization.
The sound pressure can be seen as a result of an object making too much noise where the particle velocity is very well suited to localize the cause of why an object is making too much noise. The Near Field Acoustic Camera can be used in real operating conditions and in reverberant conditions, it is no longer needed to have or create anechoic conditions. Unlike traditional techniques the array of sensors is not consisting only of sound pressure microphones but of PU sound intensity probes. The Near Field Acoustic Camera measures the particle velocity directly, which means that there are no complex and inaccurate computation steps. Hence, the Microflown Acoustic Camera yields an accurate particle velocity map in the full audible frequency range. Due to the fact that no reconstructions are required easily a dynamic range of +40dB can reached and visualized. The dynamic range is frequency independent so for all frequencies the same high dynamic range can be reached. The method displays absolute values for the sound pressure, particle velocity and sound intensity.
- Frequency range 20Hz – 10kHz/20kHz
- Large dynamic range > 45dB
- Both quantities, sound pressure and particle velocity, directly measured at one point
- Free grid configuration
- Visualization of transients
- Low suscepebility to background noise and reflections
- No need for anechoic room or anechoic conditions
- High spatial resolution
- Order Tracking
Human ears are like traditional microphones sensitive to scalar value (omnidirectional sound pressure), the Microflown however is sensitive for vector value (directional acoustic particle velocity). A combination of a Microflown with the Scan & Listen device are making our ears capable of hearing particle velocity! Listen to what nobody heard before. Listen to noise source in situations with background noise and reflections. Locating sound sources in practical environments can be difficult. Especially in situations with non-stationary sources like squeak & rattle. Just listening to particle velocity can give you better results than extensive, detailed FFT analysis!
Scan & Listen method performs quick scans instead of time consuming series of measurements. It is an intuitive method of sound source localization. Also acoustic leakages can be detected fast and accurately with the system. Quick, fast and mobile are keywords for Scan & Listen, as well as it is practical, simple and handheld. The system also has the option to record simultaneously while listening. Scan & Listen set- up contains a background noise reducing headphone (passive -40dB ), so the signal of particle velocity is even clearer in your ears.
- Direct listening to particle velocity
- Low susceptibility to background noise and reflections
- Easy finding of sources; also non stationary transients such as ”squeak & rattle”
- Easy finding of modes / vibration pattern determination
- Easy and quick in use
Microflown Technologies offers a complete solution to measure the acoustic properties of materials with its In-situ absorption setup. This method is a true alternative for the well known Kundt’s method or reverberant room method.
With a small, handheld impedance gun the acoustic absorption, reflection or impedance can be measured in just a few minutes, broad banded, under normal and oblique angles. With a sound source at 23cm from the probe the noise is generated towards the sample. The sound pressure and acoustic particle velocity are measured right on the surface of the material.
- Frequency range 300Hz – 10kHz
- In-situ method
- Normal & oblique angles of incidence
- Flat & curved surfaces
- Homogeneous & inhomogeneous materials
- Fixed and moving surfaces
- Can be used for:
End of line control before and after assembly
Microflowns Scan & Paint is a new fast tool to visualize stationary sound fields in a broad frequency range. The system is a superb engineering tool for troubleshooting or benchmarking all type of object on the spot.
The Scan & Paint method is very simple; the surface is scanned with one PU probe while a camera is positioned toward the surface to film the scanning. The recorded video and audio data are automatically synchronized by the software and the measurement are directly ready to be processed. In the post-processing for each frame of the video the position of the probe is extracted. The auto-tracking function in the software enables to automatically recognize the probe and its position by the color. At each measurement point the particle velocity, sound intensity and sound pressure are calculated from the relative time block of the audio data. A high resolution sound color map is produced as result. A reference sensor can be added to have the relative phase correlation of the surface velocities. Typically the measurement and processing time will only take a few minutes in total. The software has multiple more features as for example: display in different octave bands, frequency filtered local position audio playback, spectrum, spectrogram, sound power calculation and many more.
- Large machinery
- Acoustic enclosures
– Vehicle Interior
- Electronic consumer goods
– Washing machine
- Medical equipment