Silvia Van Der Poel wrote:
> Hi
> Can anyone help me with curve fitting routines for spectroscopy? I want to
> take my data from my laser system and get it to curve fit and calculate
> concentrations of gases using Beer's Law and a Voigt expression.... at the
> moment I think I'm not quite using the correct one! I've got a 2MHz NI
> acquisition card so spectral resolution will not be a problem...
> Thanks for any help
>
Daniel,
On my web site, you can find a VI that fits Gaussian peaks. It
shouldn't be too hard to generalize it to the Voigt profile. It is
constucted in such a way as to easily allow other functional forms to be
added. Also, one of the main tricks when fitting these peaks is to get
reasonable first guesses for the fit parameters,
to prevent the fit from
diverging. That is one of the main purposes of my program. You'll have
to adapt it somewhat for your specific peaks and the fit parameters you
use, but it should be possible.
If you get it to work, I'd be glad to hear from you.
Regards,
Dave
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David Thomson 303-499-1973 (voice and fax)
Original Code Consulting dthomson@originalcode.com
www.originalcode.com
National Instruments Alliance Program Member
Certified LabVIEW Developer
Certified Instrument Driver Developer
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Research Scientist 303-497-3470 (voice)
NOAA Aeronomy Laboratory 303-497-5373 (fax)
Boulder, Colorado dthomson@al.noaa.gov
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