The command convert
Y-axis unit changes the unit of the intensity axis
of IR, NIR, RAMAN or UV/VIS spectra or even corresponding 3D data objects.
Conversion to Absorbance, Transmittance, %Transmittance, Kubelka Munk
and Reflectance is possible. This operation is limited to those spectrum
The following picture shows the mathematics tab with selected convert
Y-axis unit function:
Converting Energy Spectra using a Reference spectrum.
Sometimes spectra are kept in the raw intensity unit provided by the
spectrometer. Typically this is Energy units or Counts. Such spectra are
useful in order to save the raw spectrometer output and being independent
of the spectrometer response characteristics. They can be converted to
transmittance or absorbance spectra with an actual reference spectrum
of the current spectrometer in use at any later time when required. This
way spectra become comparable throughout multiple spectrometers.
All you need is the raw spectrum you like to convert and the reference
spectrum of the spectrometer.
NOTE: Both spectra need to have the same unit on the x-axis and Energy
units or Counts on the y-axis! In case you have Arbitrary units on the
y-axis, please perform a preliminary conversion to Energy units as described
above. This will simply rename the y-axis unit but does not change data.
Converting the Y-axis unit is performed as follows: