ISO 15368:2021 Optics and photonics — Measurement of reflectance of plane surfaces and transmittance of plane parallel elements
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Optics and photonics — Measurement of reflectance of plane surfaces and transmittance of plane parallel elements是国际标准化组织(International Organization for Standardization，简称ISO)发布的ISO标准，适用于全球范围。标准截图
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INTERNATIONAL STANDARD ISO 15368:2021
Optics and photonics — Measurement of reflectance of plane surfaces and transmittance of plane parallel elements
1 Scope
This document provides rules for the measurement of the spectral reflectance of plane surfaces and the spectral transmittance of plane parallel elements using spectrophotometers.
This document only applies 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.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 9211-1, Optics and photonics — Optical coatings — Part 1: Vocabulary
ISO 10110-8, Optics and photonics — Preparation of drawings for optical elements and systems — Part 8: Surface texture
ISO 80000-7, Quantities and units — Part 7: Light and radiation
ISO/IEC Guide 98-3, Uncertainty of measurement — Part 3: Guide to the expression of uncertainty in measurement (GUM:1995)
IEC 60050-845, International Electrotechnical Vocabulary — Chapter 845: Lighting
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 9211-1, ISO 80000-7, IEC 60050-845 and ISO/IEC Guide 98-3, and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at http://www.electropedia.org/
3.1
transmittance
[SOURCE: IEC 60050-845:1987, 845-04-59]
ISO 15368:2021
3.2
regular transmittance
ratio of the regularly transmitted part of the (whole) transmitted flux, to the incident flux
[SOURCE: IEC 60050-845:1987, 845-04-61]
3.3
diffuse transmittance
ratio of the diffusely transmitted part of the (whole) transmitted flux, to the incident flux
Note 1 to entry: τ = τ + τ (see also Clause 4).
r d
Note 2 to entry: The results of the measurements of τ and τ depend on the instruments and the measuring r d
techniques used.
[SOURCE: IEC 60050-845:1987, 845-04-63]
3.4
internal transmittance
ratio of the radiant or luminous flux reaching the internal exit surface of the layer to the flux that enters into the layer after crossing the entry surface
3.5
reflectance
[SOURCE: IEC 60050-845:1987, 845-04-58]
3.6
regular reflectance
ratio of the regularly reflected part of the (whole) reflected flux, to the incident flux
[SOURCE: IEC 60050-845:1987, 845-04-60]
3.7
diffuse reflectance
ratio of the diffusely reflected part of the (whole) reflected flux, to the incident flux
Note 1 to entry: ρ = ρ + ρ (see also Clause 4).
r d
Note 2 to entry: The results of the measurements of ρ and ρ depend on the instruments and the measuring r d
techniques used.
[SOURCE: IEC 60050-845:1987, 845-04-62]
3.8
relative reflectance
ratio of the reflected flux from a sample to that from a reference
4 Symbols and units
For the purposes of this document, the following symbols and units apply.
λ wavelength, expressed in nanometres
p, s state of polarization
τ transmittance
τ regular transmittance
r
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