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Software FindGraph Peak fitting

The peak fitting features

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Subtract a baseline, specify peak locations, choose peak function, and perform your fit
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FindGraph performs nonlinear peak separation and analysis for spectroscopy, engineering, and chromatography. Import data from a variety of sources (ASCII, MS Excel, etc.), filter or transform the data, and run the wizard.

Peaks Fitting Wizard guides you through each step of the peak fitting process. On first step specify a sub-range of the data. For some data sets, it is more efficient to fit several subsets of your peaks rather than all at once.

Specify and subtract a baseline Specify and subtract a baseline. FindGraph supports a constant baseline (offset), a line in fixed points, a cubic polynomial, or an exponential to fit peaks with a baseline function. The initial baseline points can be set in several ways. An automated FFT smoothing is applied to find all local minimum to define baseline. You can interactively draw or edit this points with the mouse.
In general, it is much better to fit with a baseline function than to try to remove the baseline from the data and then fit. However, you can use other FindGraph baseline modeling tools to specify and subtract out the baseline before the fit.

Specify peak locations automatically and/or manually Specify peak locations automatically and/or manually The initial values for the fit, i.e., the number, X placement, height, and semi-width of the peaks can be set. Up to 15 peaks are supported. Automatically locate peaks by specifying a threshold width of peaks. FindGraph initially places peaks by finding all local maximum in a smoothed data stream. Manually locate peaks by point-and-click with the mouse. You can delete the current peak, insert a new peak or edit an old peak.
It is possible to display the smoothed second derivative of your data. It may be helpful in finding hidden peaks. If you know that two or more peaks must be separated by a certain interval, fit each peak near its initial X placement in semi-width interval only.

Choose peak function, and perform your fit Choose peak function, and perform your fit. FindGraph can fit multiple overlapping peaks using one of 20 basic peak fit types used in X-ray spectroscopy, engineering, and chromatography: Gaussian, Lorentzian, Voigt, ExpGaussian, Asymmetric Gaussian, Inverse Polynomial, Edgeworth-Cramer, and more... FindGraph will adjust the X placement, width, height, and symmetry to fit peaks. Software provides automatic logging of multi-peaks fitting analysis including coefficients, standard error, residual graphs.

Generate graphical as well as tabular results for a wide range of peak characteristics. The residuals plot is very handy in deciding whether the fit is good or whether there may be additional peaks. The baseline can be shown as well. There is a feature to find total peak area (the area between the curve and the baseline) for all peaks. Plots of curve fit, baseline, and residuals
In the following result after a fit, the residuals are just noise indicating a good fit.

Read more about:

Digitizing Digitizing
Graphing Graphing
Curve fitting Curve fitting
Best-fit Best-fit equation
Closed curves Closed curves
Rationals Empirical models
Library Library
Analysis Analysis
Tools Tools
Filters Filters
Convolution Convolution
Extract of periodic signals Periodic signals
Procrustes analysis Procrustes analysis
SSA forecasting SSA forecasting

 

 

 

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