finding peak or shoulder of a curve
- From: Telemaque <x@xxxxxxxx>
- Date: Tue, 4 Oct 2005 13:40:47 -0500 (CDT)
I have an array of PMTs. In order to set
the biases individually, I need to identify a particular feature on a spectral
curve and measure where it lies for each PMT. Due to the different
physical characteristics of the tubes, and the fact that the source (Na-22) is
not the same distance away for each tube, each energy spectrum is
different. I need to pick out the 511 keV peak, and have written a
program which does it well; as long as the curve has a well pronounced peak
that is. For curves where the peak is not pronounced (more of a shoulder than a peak), my
program is useless.
Does anyone know of a method for picking out these more subtle features of a
curve...even a good third party package?
It has been suggested that I do curve fitting first but I don't know of a
formula describing the curve and so have not had much luck with the curve
fitting VIs built into LabVIEW.
The attached picture shows a curve with a "good" peak and one which is "bad" and has no pronounced peak.
Any guidance is appreciated.
good_curve-and-bad_curve.jpg:
http://forums.ni.com/attachments/ni/170/145550/1/good_curve-and-bad_curve.jpg
.
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