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RMS Spot Radius Definition for NSC detector

  • May 6, 2021
  • 1 reply
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I am working in NSC mode and observing a top hat like beam on a detector. I want to know the D4s beam diameter of the beam profile. From the documentation it looks like the RMS spot radius in the “Beam Info” tab on the detector viewer is the second moment – but it’s unclear to me.

For example when I calculate the D4s beam diameter from the beam profile using Matlab I get a value that is about 1.41 times larger than the 2x the RMS Spot Radius.

Can you please provide details on what the RMS spot diameter is calculating?  

Thanks! 

 

Best answer by Ross.Stanley

The info is in the help file under NSDD

e.g. 'The second moment of r2 based on flux data of all pixels. This can be considered as the weighted RMS radial distance of all the pixel with respect to the centroid'
 

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  • Ross.Stanley
  • Monochrome
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  • May 11, 2021

The info is in the help file under NSDD

e.g. 'The second moment of r2 based on flux data of all pixels. This can be considered as the weighted RMS radial distance of all the pixel with respect to the centroid'
 

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