FAQ

FAQ | Scan & Paint

Q1: Which is the latest version of Scan & Paint software?
Q2: Which are the current Scan & Paint hardware elements?
Q3: What frontends are compatible with the Scan & paint software?
Q4: What probes are compatible with Scan & Paint setup?
Q5: What non-Microflown sensors are compatible with Scan & Paint software?
Q6: What is the size and weight of the total setup including the boxing?
Q7: Is there any online training to learn how to use the setup?
Q8: When do I need more probes for the measurement?
Q9: What are the frequency limits for sound source localization and what indicator is best to use?
Q10: What is the frequency range valid to measure intensity / velocity / pressure in the near field?
Q11: What is the advantage to measure velocity or intensity for sound source localization?
Q12: What is the frequency resolution of the method and what does it depend on?
Q13: What is the spatial resolution with Scan & Paint?
Q14: At what distance can I measure sound Intensity and velocity for the near field sound source localization?
Q15: What is the recommended scanning speed and what does it affect in the results?
Q16: Is there any problem to scan different lighting areas in the same measurement?
Q17: What calculations are needed to display velocity or intensity?
Q18: What is the minimal distance of a reflective surface to measure correctly sound intensity?
Q19: How I can check if the intensity measured is good or not?
Q20: What errors can occur in the result?
Q21: Which analyze method should I choose?
Q22: Is it possible to compare several measurements? If so, how can I do it?
Q23: Can the recorded data be replayed?
Q24: How do I read the values for calibration?
Q25: Where to introduce the calibration coefficients?
Q26: Do I need MatLab to run the Microflown Scan & Paint application?
Q27: What is the connection with the frontend-PC and how many ports are needed?
Q28: Do I have to calibrate the frontend before every measurement?
Q29: Why I don’t get any signal from the MFDAQ calibration procedure?
Q30: Is there any limitation on operative system and / or 64 to 32 bits systems?
Q31: Do I need to be the computer admin to run the software?
Q32: How can I activate my software?

 

Q1: Which is the latest version of Scan & Paint software?  

Scan&Paint 2.0



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Q2: Which are the current Scan & Paint hardware elements?  
  • PU probe
  • Signal conditioner
  • Scout 422
  • Webcan Logitech B910


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Q3: What frontends are compatible with the Scan & paint software? 
  • Scout 422 
  • MFDAQ-2  
  • NIDAQ USB-9234 
  • NIDAQ USB-4431


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Q4: What probes are compatible with Scan & Paint setup?   

All Micoflown sensors are compatible.



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Q5: What non-Microflown sensors are compatible with Scan & Paint software?

Any pressure microphone and accelerometer can be used, also IEPE.



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Q6: What is the size and weight of the total setup including the boxing?   

Dimensions: 41 x 50 x 22 cm
Weight: 8 Kg



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Q7: Is there any online training to learn how to use the setup?  

Yes, there is a video tutorial explaining all Scan & Paint features. Access can be requested at



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Q8: When do I need more probes for the measurement?   

When you have to measure a transient sound field, for example a run-up of a car or a door slam, you will need multiple probes. You can use for this application the Acoustic camera software.



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Q9: What are the frequency limits for sound source localization and what indicator is best to use?   

Particle velocity is the best indicator because velocity is less environment dependent, maximizing Signal to Noise Ratio in the vicinity of the noise source. usable frequency range± 40 Hz-10KHz.



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Q10: What is the frequency range valid to measure intensity / velocity / pressure in the near field?   
Particle velocity: 40-10.000 Hz
Intensity: 400-10.000 Hz
Pressure: 40-10.000 Hz


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Q11: What is the advantage to measure velocity or intensity for sound source localization? 

The velocity in the near field is not affected by background noise and reflections, and as it is a vectorial magnitude it gives and indication of the sound source location. The sound intensity resembles the information of the amount of energy coming from a certain direction. PU intensity probes can measure in environments with high pressure-intensity indexes (due to background noise). From the sound intensity the sound power can be calculated, which (for closed surfaces) is not dependent on the measurement distance.



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Q12: What is the frequency resolution of the method and what does it depend on? 

The frequency resolution can get down to a few Hz. But it depends on: 

  • The Analyze parameters selected in the analyze tab;
  • The selected analyze method (Grid or Point) selected in the analyze tab;
    • Point method: selecting a  long time series leads to less spatial resolution
    • Grid method: selecting a bigger grid size leads to a  better frequency resolution  or with the same grid size, slower scans also lead to more frequency resolution in the results.
  • The length of time series;


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Q13: What is the spatial resolution with Scan & Paint?  

The spatial resolution of the system can vary from mm to several cm. The spatial resolution of the Scan & Paint depends on:

  • Scanning speed: the slower the surface is scanned, the higher spatial resolution
  • The video frame affects the spatial resolution is the point method is the analyze method chosen.

Note: above 15 FPS this parameter has no effect, so increasing the frame rate to higher values will not improve the resolution

  • Distance camera-item: the further  the less pixels will be used to represent the same area


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Q14: At what distance can I measure sound Intensity and velocity for the near field sound source localization? 

For sound source location, particle velocity is the best indicator. Measurements should be performed 1-5 cm away from the surface to obtain the highest Signal to Noise Ratio. The intensity should be measured 5- 10 cm away to avoid reactivity error problems in the results. 



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Q15: What is the recommended scanning speed and what does it affect in the results?

Scanning at 5-10 cm /s is the recommended pace.



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Q16: Is there any problem to scan different lighting areas in the same measurement?  

All tracking settings such as color to track, probe orientation, speed… can be adjusted and changed at any moment during the post processing stage so any variation on these parameters will not affect the final result.



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Q17: What calculations are needed to display velocity or intensity?  

The velocity is directly measured. To display velocity the time signals or spectra can be shown. The intensity can be calculated from the real part of the cross-spectrum between pressure and velocity.



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Q18: What is the minimal distance of a reflective surface to measure correctly sound intensity?

Depends on distance from the measurement surface, in the near field (2-3cm from the surface) the intensity is not affected by a reflective plate at 50cm distance. 



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Q19: How I can check if the intensity measured is good or not?

The PU probes are affected by the ratio between reactive/active intensity (J/I index). For the calibration performed with the POS system (standard Microflown calibration method) this index should lower than 5dB (which equals to a 72 deg phase between pressure and velocity). The reactive intensity is the imaginary part of the cross-spectrum between pressure and velocity. The reactivity error can be displayed and plotted directly in the software.



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Q20: What errors can occur in the result?

Different deviations can appear in the results if the setup is not correctly used:

  • Camera angle: if camera is not aligned with measured element the sound map projection will change.
  • Offset settings: if while tracking the video image the off-set position is not correctly aligned the measured position and the tracked one will diverge.
  • Probe hitting: if the probe is knocked on the measured surface while scanning, this will appear in the result as a noise source. There are tools in the software to detect and eliminate these fake noise sources.
  • Non-stationary disturbances during the measurement. Using the grid analyze method these effects are mitigated.


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Q21: Which analyze method should I choose?

Both methods are perfectly valid, but there are some intrinsic characteristics that will make one more preferable in certain circumstances:

  • Point method:
    • Higher spatial resolution
    • Camera projection error minimized
  • Grid method:
    • More accurate results
    • More robust against non-stationary noise sources
    • Smoother color maps
    • Faster processing


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Q22: Is it possible to compare several measurements? If so, how can I do it?

Yes, it is possible to load several measurements in the same tab with the same scaling, frequency resolution and settings, in order to compare them. Use "generate Multiview" function in an Analyze tab to obtain the comparisson.



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Q23: Can the recorded data be replayed?
Yes. The recorded data can be replayed from the whole time history or in each of the tracked measurement positions with their assigned time slot.


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Q24: How do I read the values for calibration? 

The response of the Microflown is not flat like a standard microphone, so next to a general sensitivity value it needs to be corrected via calibration. The calibration curve in amplitude and phase is defined by some coefficients in the calibration report.



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Q25: Where to introduce the calibration coefficients?

In the setting tab of the software is possible to introduce the calibration values and store them for different probes. 



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Q26: Do I need MatLab to run the Microflown Scan & Paint application?  

No, MatLab is not required for the installation of Microflown software packages. 



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Q27: What is the connection with the frontend-PC and how many ports are needed?

A USB connection is used to link the frontend to the PC. The video camera uses also a USB port. In total 2 USB ports are needed to run the program. 



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Q28: Do I have to calibrate the frontend before every measurement?

No, only the Microflown DAQ needs manual calibration. It has to be only calibrated every time you open the Microflown software or when you change the volume setting in the software before your measurement. With the new 24bit frontend, Scout 422 is not necessary to perform any calibration before measuring. 



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Q29: Why I don’t get any signal from the MFDAQ calibration procedure?  

Only the MFDAQ-2 needs to be calibrated before measuring. If the calibration signal cannot be seen on the screen, or the Scan & paint settings are not properly set or the calibration button on the card is not working. 



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Q30: Is there any limitation on operative system and / or 64 to 32 bits systems? 

The software can operate in 64 and 32 bits systems and with OS: Windows XP, Window 7, Windows 8.



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Q31: Do I need to be the computer admin to run the software?

Yes, if not the program will not be able to run properly and can occur “dtol.dll” error message or not loaded/ not found NIDAQ. 



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Q32: How can I activate my software?

To activate a license you have to send an email with the two activation codes and the serial number of the probe or order number, to .



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