GB/T 40965-2021Measurement of retroreflection (English PDF)
回复反射的测量方法
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
November 26, 2021
Implementation date
June 1, 2022
Scope
GB/T 40965-2021 is the English-translated version of 回复反射的测量方法.
GB/T 40965-2021 describes the geometric system used for retroreflection and specifies how retroreflection is measured. It applies to the optical performance measurement of retroreflectors and retroreflective materials.
The document defines the terms used, sets out the geometry system, and covers laboratory photometric measurement methods with their measurement uncertainty, measuring geometry, the colour of retroreflectors and on-site measurement.
Informative annexes give conversion formulas between geometry systems, guidance on aperture and an example of converting road lighting and observation conditions into a retroreflective measurement system.
It relies on GB/T 26377 for retroreflective measuring instruments and on GB/T 39388 for the characterization of illuminance and luminance meters. It was issued on 26 November 2021 and has applied since 1 June 2022.
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Document preview — GB/T 40965-2021
National Standard of the People's Republic of China
- ICS
- 43.040.20
- Classification
- K 70
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- Foreword
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
- 4 Geometry system
- 5 Laboratory photometric measurement methods and measurement uncertainty
- 6 Measuring geometry
- 7 Retro reflector color
- 8 On-site measurement
- Appendix A (informative) Conversion formulas between systems
- Appendix B (informative) Aperture
- Appendix C (informative) An example of converting the lighting/observation conditions in a road into a retroreflective measurement system
- Reference
Foreword
This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1: Structure and Drafting Rules of Standardization Documents" Drafting.
1 Scope
This document describes the geometric system of retro-reflection applications and specifies the measurement method of retro-reflection.
This document is applicable to the optical performance measurement of retro-reflectors and retro-reflective materials.
2 Normative references
The content of the following documents constitutes an indispensable clause of this document through normative references in the text. Among them, dated quotations Only the version corresponding to the date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to this document.
GB/T 26377 Retroreflective measuring instrument
GB/T 39388 Illuminance meter and luminance meter performance characterization method (GB/T 39388-2020, CIES023/E.2013, IDT)
CIE51.2-1999 A method for evaluating the quality of daylight simulators for chromaticity measurement (A method for assessing the quality of daylight simulators for colorimetry)
3 Terms and definitions
The following terms and definitions apply to this document.
3.1 General definition
3.1.1 Retroreflection
A reflection of reflected light returning from the opposite direction close to the incident light. When the direction of the incident light changes within a large range, it can still be Keep this nature.
Note 1. Retro-reflection is also called retro-reflection.
Note 2. The conical spatial distribution of retro-reflected light is shown in Figure 1.
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 39 pages — is available in the English PDF.
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Related Standards
GB/T 26377-2010 — Retroreflectometer
GB/T 39388-2020 — Characterization of the performance of illuminance meters and luminance meters
GB/T 7251.4-2026 — Low-voltage switchgear and controlgear assemblies - Part 4: Particular requirements for assemblies for construction sites (ACS)
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GB/T 40965-2021
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