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Spectrometer
4. Click the calibrate button. A progress bar will appear in the top left of the window. If the
calibration is successful, a dialog box will appear confirming whether to close the calibration
window. The new calibration is now saved on the device. Any new spectra will be displayed
with the new wavelength calibration.
The calibration can be reset to the factory values by opening the command window from the
System toolbar and sending <resetwavcal:1> to the device.
9.6
Peak Finding Parameters
The software can identify up to 20 peaks in a spectrum. This feature is enabled using the check
boxes in the Plot Properties menu. Enabling 'Peaks' will display the peak positions next to the
identified peaks, while 'Widths' will show the full-width-half-maximum of the peak. Note that
enabling either or both peak finding functions may reduce the data rate.
The peak finding parameters define the conditions required for a peak to be identified. They can
be accessed by selecting 'Find Peak Parameters' from the Tools menu. A peak should fulfil all the
parameters to be identified.
The meanings of the parameters are as follows:
Height – The minimum height of a peak as measured from 0.
•
Threshold – The minimum vertical difference between the maximum point and the
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neighbouring points. This is generally used for identifying very narrow peaks and is
normally be set to 0.
Prominence – The vertical separation between the peak and its highest minimum contour,
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i.e., for a symmetrical peak it is the vertical distance between the summit and the base, for
a non-symmetrical peak it is the vertical distance between the summit and its highest
bottom edge.
Width – The minimum required full width at half maximum of the peaks.
•
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Figure 9.8. Peak finding parameter settings.
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User Manual
Ossila Limited © 2023
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