Olympus USPM-RU-W Series Operation Manual page 82

A refractive index is calculated from spectral measured value data using the expression
below when it is displayed according to the setting state on a GRAPH setting window.
R
n
Setting the theoretical reflection factor of a reference
As known by the calculation expression (6-1) of the spectral measured value data
described above, the theoretical reflection factor (transmission factor) of a reference must
be set in advance to calculate the spectral measured value data. The way to set a
refractive index and the way to set a reflection factor (transmission factor) are used to set
the theoretical reflection factor (transmission factor) of a reference. Four methods are
provided in all.
(1) Setting the refractive index using the dispersion formula
The refractive index of a reference is set using Sellmeier, Schott, and Cauchy dispersion
formulas. The theoretical spectral reflection factor (transmission factor) calculated from
the set refractive index using the expression below is treated as the theoretical spectral
reflection factor (transmission factor) of a reference. These dispersion formulas are also
given below. The coefficients of each dispersion formula can be edited by creating
dispersion setting files on a DISPERSION editing window.
R
theory ( )
n
PV8959-F4E005
1 R
n
1 R
Spectral measured value data
( )
Spectral refractive index data
1
R
theory
1
Theoretical spectral reflection (transmission) factor of reference
Spectral refractive index data
................ (6-2)
2
n
......... (6-3)
n
29