Andor Technology iXon Ultra 897 User Manual page 90

The data type 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.
Refer to the detailed specification accompanying your particular CCD detector for
the number of electrons that correspond to 1 count.
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
%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)
Percentage 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
CHOOSING THE DATA TYPE
Page 90
Counts
Counts
(Bg. corrected)
%Absorptance
%Reflectance
Section 4 . 6