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Homepage>BS Standards>17 METROLOGY AND MEASUREMENT. PHYSICAL PHENOMENA>17.180 Optics and optical measurements>17.180.01 Optics and optical measurements in general>20/30352222 DC BS ISO 15368. Optics and photonics. Measurement of reflectance of plane surfaces and transmittance of plane parallel elements
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20/30352222 DC BS ISO 15368. Optics and photonics. Measurement of reflectance of plane surfaces and transmittance of plane parallel elements

20/30352222 DC

BS ISO 15368. Optics and photonics. Measurement of reflectance of plane surfaces and transmittance of plane parallel elements

CURRENCY
LANGUAGE
English
Standard number:20/30352222 DC
Pages:28
Released:2020-03-25
Status:Draft for Comment
DESCRIPTION
This standard 20/30352222 DC BS ISO 15368. Optics and photonics. Measurement of reflectance of plane surfaces and transmittance of plane parallel elements is classified in these ICS categories:
  • 37.020 Optical equipment
  • 17.180.01 Optics and optical measurements in general

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

  τ r is the regular (specular) transmittance;
  τ d is the diffuse (scattered) transmittance;
  ρ r is the regular (specular) reflectance;
  ρ d is the diffuse (scattered) reflectance.
NOTE

Wherever the Greek letters are mistakable, T and R can be used.

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.


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