Andor Technology iXon Ultra 897 User Manual page 92

CHOOSING THE DATA TYPE
Attenuation Attenuation (dB)
is a measurement, in decibels, of light absorbed due to transmission
through a material - decibels are often used to indicate light loss in fiber optic cables,
for instance. 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
Attenuation = 10 x log ((Signal - Background) / Reference)
10
Data * Ref
allows you to 'custom modify' the background corrected signal:
Data * Ref
Data x Ref = (Signal - Background) x Reference Store Value
See the Andor Basic Programming Manual for similar operations.
Log
simply calculates the logarithm to the base 10 of the background corrected
Log
10
10
signal counts.
Log Base 10 = log (Signal - Background)
10
Section 4 . 6
Page 92