Andor Technology iKon-L - Acquiring Data

ACQUIRING DATA
iKon-L SECTION 5
Page 49
Table 7 - Data types
OPTION FUNCTION
Counts
Counts represents raw, digitized data (i.e. no calculations have been performed on the data) from the
CCD detector’s analog to digital (A/D) converter.
Please refer to the detailed performance sheet accompanying your particular CCD detector for the
number of electrons that correspond to 1 count.
Counts (Bg corrected)
Counts (Background Corrected) is digitized Data from the CCD detector’s analog to digital (A/D)
converter, where Background (or dark signal) has been removed.
Counts (Bg. Corrected) = Signal - Background
Counts (per second)
Counts ÷ Exposure Time.
Count
(Bg corrected per second)
Counts (Bg corrected) ÷ Exposure Time.
%Absorptance
Represents the light absorbed by an object.
If Reference is the background corrected incident intensity, and Signal - Background the transmitted
intensity (i.e. the intensity of light which has passed through the material being examined), then:
% Absorptance = 100 x (1 - (Signal - Background) / Reference)
%Reflectance
Represents the light reflected by an object.
If Reference is the background corrected incident intensity, and Signal - Background the reflected
intensity (i.e. the intensity of light which has been reflected from the material being examined), then:
% Reflectance = 100 x (Signal - Background) / Reference
%Transmittance
Represents the light transmitted by an object.
If Reference is the background corrected incident intensity, and Signal - Background the transmitted
intensity (i.e. the intensity of light which has been transmitted through the material being examined), then:
% Transmittance = 100 x (Signal - Background) / Reference
Flatfield
Flatfield is used to remove any pixel-to-pixel variations that are inherent in the CCD sensor.
If Reference is the background corrected incident intensity, the Signal is divided by the Reference so:
Flatfield = M x Signal / Reference
Where M is the Mean of Reference.