How to calculate FWHM of beam profile

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KS on 18 Sep 2017
Commented: Akira Agata on 20 Sep 2017
I had acquired an image. After that, I plotted a beam profile from that image (as shown in attached picture below). I need to evaluate the FWHM of that beam profile in order to obtain distance between two point at half of maximum value.
The other problem I had faced is the noisy at pixel number 51 - 52.
My idea is to eliminate the noisy pixels and evaluate the FWHM. But, I dont know how to do it since the beam profile was flipped. Anyone know how to do it?
Thank you.
dpb on 18 Sep 2017
Use negative of signal to turn peak upside down is the classic way...
Akira Agata
Akira Agata on 20 Sep 2017
Using median filter medfilt1 will remove this kind of spike noise. Then, use negative of signal. And applying findpeaks to identify the peak position. I believe this would be a straight-forward way to solve this problem.

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