area & FWHM

[joseph_1]

Hello,

I need to pick peaks from a txt file and then find the area under the curve(first curve from left) and also the FWHM of first curve.  I could plot the XY graph and I used the peak detector.vi.  but  how to get the area under peak and FWHM. I’ve attached the VI and a text file.  I appreciate if anyone could give tips to do it.

Thanks in advance.

Joseph

[Jonnie_5]

You need to define the limits of integration.  There's several methods out there, such as threshold above baseline or based on derivatives (or the simplest is user defined).  Once you define the peak start and end, it's a simple matter to integrate the curve and get the half width.  You could probably search for some HPLC or CE programs that already do this, such as this one (cheap plug for myself):  http://www.umich.edu/~rtkgroup/NetworkMI.htm

[joseph_1]

Hi Jonnie 5,

Thanks for your reply. will try to do as u've suggested.

Thanks

Joseph