Optical Thin Film Software TFV
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Simple calculation tools

Convert relative reflectance to absolute reflectance

Convert relative reflectance measured with a spectrophotometer to absolute reflectance.


1. Measurement method:
Normal (Reference=100)
Reversed (Sample=100): the reference and sample positions are swapped.

2. Reference glass:


3. Wavelength(nm):


4. Measurement value (Relative reflectance):




Result (Absolute reflectance):
Excel version is here:

Substrate Refractive Index

Calculate the refractive index of a substrate without absorption

Calculate the refractive index of an uncoated substrate from its reflectance or transmittance.

1. Measurement method:
One side reflectance
Total reflectance from both surfaces (substrate polished on both sides)
Transmittance through both surfaces (substrate polished on both sides)

2. Measurement value(%):




Result (Refractive index of substrate):
Excel version is here:
 

Calculates the refractive index, extinction coefficient, and internal transmittance of a substrate with absorption

Excel version is here:

Mean Free Path

Calculate Mean Free Path.


1. Kind of gas:


2. Temperature(Celsius, ℃):


3. Pressure(Pa):

Input format: 0.001 or 1e-3



Result:
Mean Free Path (m)
Mean Speed (m/s)
Impingement rate (particles/(s·m²))

References: 真空技術実務読本 オーム社, Japan

Color Calculation

Calculate the color system values from XYZ tristimulus values.


1. Observer:


2. Illuminant:


3. XYZ:
X:
Y:
Z:




Result:
x , y

L* , a* , b*
, C* , h

Hunter L , a , b

L* , u* , v*
, u' , v'

sRGB R , G , B

Calculate XYZ, xy, and L*a*b* values from spectral data. (Excel spreadsheet)

ColorCalcExcel

Smartphone app

Thin film calculation tool for Android smartphones.

Optical thin film calculator
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