BSI 20/30352222 DC 2020

This document provides rules for the measurement of the spectral reflectance of plane surfaces and the spectral transmittance of plane parallel elements using spectrophotometers.

The transmittance τ and the reflectance ρ of optical components are generally divided into two parts as follows:

where

This document applies only to measurements of the regular transmittance and the regular reflectance; it does not apply to those of the diffuse transmittance and the diffuse reflectance.

This document is applicable to test samples, which are coated or uncoated optical components without optical power.