Olympus USPM-RUIII Series - Page 77

8. Details of [Analyze] Menu
PV6253-F4E016 35
 [Use the board refractive index]
If [Use the board refractive index] is currently selected, the file data (Reflectance
data of board: *. csv) set at the [board] tab, the wavelengths of the peaks or valleys of
coat + board reflectance, and the reflectances at those wavelengths will be employed as
the coat refractive index for film thickness calculation. (*: An arbitrary file name)
n
R
R
n
c b



 
1
1
8 1( )
c
n
: Coat refractive index
b
n
: Board refractive index
R
: Spectral reflectance in coated state
When n
c
< n
b
, use R
min
(Valley) for R, and when n
c
> n
b
, use R
max
(Peak) for R.
The refractive index of the coat is calculated by the above equation.
8.1.3. [Fix value] tab
As the refractive index of the coating material to be measured, set a given refractive index
(fixed value) that does not take into account wavelength dispersion.