Guidelines

Where is FWHM in origin?

by Rhyley Bryan

Where is FWHM in origin?

For the GAUSS function the FWHM=w*sqrt(ln4), for the VOIGT function there is approximation FWHM=0.5346wL+sqrt(0.2166*wL^2+wG^2), where wL and wG (widths of the Lorentzian and Gaussian contributions) are given by the Origin after the fitting.

How do you do FWHM?

FWHM can be determined as the distance between the curve points at the peak half maximum level. On a data graph, draw a vertical line from the peak maximum to the baseline. Measure the length of this line and divide it by 2 to find the center of the line.

How do you integrate Peak area in origin?

Steps

  1. Start a new workbook and import the file \Samples\Spectroscopy\Peaks with Base.
  2. Highlight the second column.
  3. In the main menu, click Analysis, then point to Peaks and Baseline, and then click Peak Analyzer.
  4. In the first page (the Goal page) of the Peak Analyzer, select Integrate Peaks in the Goal group.

What does FWHM stand for in the sky?

Thanks for the reference. FWHM is actually Full Width at Half Maximum, which indicates it is the width of the star profile half way to the peak.

When is the FWHM output to the report?

When fitting with the Gauss function, the FWHM is output to the report. If your function is Gaussian (note that it is different from Gauss) or Lorentz, the w parameter is the FWHM. You can also select Analysis: Peaks and Baseline: Peak Analyzer.

How do I calculate the FWHM in Excel?

You can fit your data, choosing the Analysis: Fitting: Single Peak Fit or Analysis: Peaks and Baseline: Multiple Peak Fit menu. When fitting with the Gauss function, the FWHM is output to the report. If your function is Gaussian (note that it is different from Gauss) or Lorentz, the w parameter is the FWHM.

Can a FWHM be all about the same?

You can see that at their FWHM, they are all about the same, which does line up with what Frank said. Usually, when measuring FWHMs, the tool you use to do it will have some means of configuring what level of brightness to cut the calculation off at. Some also have a black point setting.