HP Data Explorer 4 Series Manuel d'utilisateur Page 167

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Process that Occurs During Peak Detection, Centroiding, and Integration
Data Explorer
Software Users Guide 3-69
3
After peak
detection
After peaks are detected:
Centroid mass is calculated for spectral data, then
modified by Gaussian peak fitting, if it is selected.
Chromatographic and spectral peaks are integrated.
Peak lists are generated for chromatograms and spectra.
Centroiding The Data Explorer software calculates the peak centroid for
spectral data by:
Drawing a projected centroid baseline at the
percentage of the peak height specified by the
Centroiding% entered. Centroiding is measured
between the top of the peak and 0. For example, a
centroiding% of 10 uses the top ten percent of the peak,
where peak height is determined from 0.
Searching to the left and right of the apex for data
points that bound the projected centroid baseline, then
interpolating the centroid baseline.
Calculating the intensity-weighted area of the peak
from the left to the right intersection of the centroid
baseline, then dividing by the area of the same
region.
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