ISO 19962:2019
Optics and photonics — Spectroscopic measurement methods for integrated scattering by plane parallel optical elements
This document specifies procedures for determining the spectroscopic forward scattering characteristics of coated and uncoated optical surfaces over a specified wavelength range between 350 nm and 850 nm using a double-beam spectrophotometer with an integrating sphere. This document is also applicable to the forward scattering properties at a single wavelength.
This document is applicable to spectroscopic forward scattering measurements with collection angles larger than 2,7 degrees. ISO 13696 provides a measurement method for smaller collection angles.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms, definitions and symbols
3.1 Terms and definitions
3.2 Symbols
4 Principle
5 Measurements using a double-beam spectrophotometer
5.1 General
5.2 Double-beam spectrophotometer
5.2.1 General
5.2.2 Radiation source
5.2.3 Optical system
5.2.4 Integrating sphere
5.2.5 Detection system
5.3 Test environment
6 Specimen preparation
6.1 Specimen
6.2 Conditioning of specimen
7 Procedure
7.1 Performance certification of double-beam spectrophotometer
7.2 Measurement of baseline
7.3 Specimen mounting
7.4 Measurement of specimen transmittance
7.5 Measurement of remaining scattering
7.6 Measurement of scattering with specimen
7.7 Calculation of the forward scattering of the specimen
7.8 Calculation of the mean forward scattering of the specimen
7.9 Uncertainty budget
8 Test report
Annex A (informative) Measurement examples of the specimen transmittance, remaining scattering and scattering with a specimen
Annex B (normative) Performance certification of a double-beam spectrophotometer
Annex C (informative) Influence of minimum scattering collection angle to measured forward scattering
Annex D (informative) Derivation of the formula of forward scattering
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms, definitions and symbols
3.1 Terms and definitions
3.2 Symbols
4 Principle
5 Measurements using a double-beam spectrophotometer
5.1 General
5.2 Double-beam spectrophotometer
5.2.1 General
5.2.2 Radiation source
5.2.3 Optical system
5.2.4 Integrating sphere
5.2.5 Detection system
5.3 Test environment
6 Specimen preparation
6.1 Specimen
6.2 Conditioning of specimen
7 Procedure
7.1 Performance certification of double-beam spectrophotometer
7.2 Measurement of baseline
7.3 Specimen mounting
7.4 Measurement of specimen transmittance
7.5 Measurement of remaining scattering
7.6 Measurement of scattering with specimen
7.7 Calculation of the forward scattering of the specimen
7.8 Calculation of the mean forward scattering of the specimen
7.9 Uncertainty budget
8 Test report
Annex A (informative) Measurement examples of the specimen transmittance, remaining scattering and scattering with a specimen
Annex B (normative) Performance certification of a double-beam spectrophotometer
Annex C (informative) Influence of minimum scattering collection angle to measured forward scattering
Annex D (informative) Derivation of the formula of forward scattering
Bibliography