ACQUIRING DATA
iKon-L SECTION 5
Page 51
As an example, the system will compute % Absorptance as:
100 x (1 - (Signal - Background) / Reference).
The illustration below shows a typical use of Background, Reference and Signal for computations such as
%Absorptance or %Transmittance:
The default data type (used when you capture data and have not explicitly made a selection from the Data
Type dialog box) is Counts.
• If you select any data type
other than
The calculations for the various data types assume the following definitions:
Counts or Counts (Bg Corrected) you will have to perform Take
Background and Take Reference (in that order) before performing Take Signal.
• Signal: uncorrected raw data acquired via Take Signal. ‘Signal’, as used in the definitions of the
calculations, refers to ‘raw’ data from the CCD and should not be confused with the possibly
‘processed’ data to be found under the Sig tab of the Data Window.
• Background: data in uncorrected Counts, acquired in darkness, via Take Background.
• Reference: background corrected data, acquired via Take Reference.
If you require raw or background corrected data pertaining to the light source itself, Signal will be data
acquired directly from the source.
If you intend to compute the reflection, transmission or absorption characteristics of a material, Signal will be
data acquired from light that has passed through or has been reflected from the material being studied.
NOTES:
1. ‘Signal’, as used in the definitions of the calculations, refers to ‘raw’ data from the CCD and
should not be confused with the possibly ‘processed’ data to be found under the Sig tab of the
data window.
2. Functionality for displaying and manipulating data is only available if a data file has been
opened, if data have been newly acquired, or if you are using the Andor Basic programming
language to create a new window in which to display data. In each case data are displayed in
a data window.
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