ACQUIRING DATA
iKon-L SECTION 5
Page 50
Table 7 - Data types (continued)
OPTION FUNCTION
Absorbance units
A measure of light absorbed by an object (i.e. they represent the object’s Optical Density - OD).
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
Transmission = (Signal - Background) / Reference.
Absorbance Units are defined as Log10 (1 / Transmission), therefore:
Absorbance Units = Log
10
(Reference / (Signal - Background)).
Absorption Coefficient (/m)
Indicates the internal absorptance of a material per unit distance (m).
It is calculated as -loge t, where t is the unit transmission of the material and loge is the natural logarithm.
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:
Transmission = (Signal - Background) / Reference
and:
Absorption Coefficient = -loge ((Signal - Background) / Reference)
Attenuation
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 log10 ((Signal – Background) / Reference)
Data*Ref
Allows you to ‘custom modify’ the background corrected signal:
Data x Ref = (Signal – Background) x Reference Store Value
Please refer to the Andor Basic Programming Manual for similar operations
Log 10
Calculates the logarithm to the base 10 of the background corrected signal counts.
Log Base 10 = log
10
(Signal - Background)
Radiometry (Optional extra)
Allows you to calculate values for radiance or irradiance. The system requires that you supply calibration
details. NOTE: This option must be ordered separately.
Radiometric calculation for Mechelle spectrograph. Supplied with Mechelle systems.
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