GB/T 40965-2021 in English

VALID

Measurement of retroreflection

Issued on:2021-11-26
Implemented on:2022-06-01
File Format:PDF
Delivery:Via email within 5 business days

Price(USD)： $330.00
$321.00

Standard No:	GB/T 40965-2021
Document status:	VALID
Title in English:	Measurement of retroreflection
Title in Chinese:	回复反射的测量方法
Language:	English
File Format:	Electronic (PDF)
Delivery:	Via email within 5 business days
Issued on:	2021-11-26
Implemented on:	2022-06-01
ICS Classification:	43.040.20-Lighting signalling and warning devices
Chinese Classification:	K70-Electric lighting in general
Professional Classification:	GB-National Standard
Related Topics:	non reply reflection measurement Fluorescence Reply reflection measurement How to measure reflection coefficient Anti-t3 detection method Reflection measurement method Measurement method of reflection coefficient hemispheric reflection Standard Method for Measuring Reflectance reflection sample recoil method reflectivity angle reflectometry opposite reply Reflective Structure Measurements complex scattering Charge repeatedly repeated freeze-thaw method spectral reflectance method for reflection measurements Reflection method of collimator Measurement of reflection and transmission regular reflection Reflectance measurement method GBT40965 GB/T 40965-2021 Terminal reflection coefficient measurement method retro reflector installation Repeated purification method Repeated freezing and thawing method to recover poison Industrial methods of measuring reflectance reflection Brachioradialis reflex test method Complex Modulus Test Method Retroreflection measurement method

《GB/T 40965-2021回复反射的测量方法》由TC224（全国照明电器标准化技术委员会）归口，TC224SC3（全国照明电器标准化技术委员会光辐射测量分会）执行，主管部门为中国轻工业联合会。

Introduction

Analysis of the core content of the standard

Terminology

The standard clearly defines key concepts such as retro-reflector and retro-reflective element, among which:

Retro-reflectance ratio: the ratio of reflected to incident luminous flux, reflecting the reflection efficiency of the material
Observation angle (α): the angle between the illumination axis and the observation axis, usually <10°
Incident angle (β): decomposed into two orthogonal components β₁ and β₂

Geometric system comparison

System type	Applicable Scenarios	Core Parameters	Conversion Formula
CIE Goniometer System	Laboratory Benchmark Measurement	α,β₁,β₂,ε	β=cos^-1(cosβ₁cosβ₂)
Road Marking System	Horizontal Pavement Measurement	a,e,b,d	α=cos^-1(sina sine-cosacosb cose)

Laboratory Measurement Method

Ratio method

Calculation formula: RI=(m_T-m_D)·d₁²/m_S, requirements:

15m darkroom environment
Light source stability＜1%
V(λ) matching error≤3.5%

Sources of uncertainty

Geometric positioning error (angle tolerance±0.1°)
Aperture effect (standard circular aperture 0.05°~0.333°)
Spectral mismatch (extreme colors can reach 5%)

Implementation suggestions

Field measurement specifications

For road marking materials:

Fixed geometry: α=1.05°, β₁=88.76°
Recommended aperture: 0.33°×0.33° (detector)
Calibration requirements: Use reference standard plates of the same color system

Technology Evolution

For the first time, the standard systematically integrates four geometric system conversion formulas to solve the following problems in traditional measurement:

Problems with rotation sensitivity of prism reflectors
Problems with comparability of multi-laboratory data
Problems with consistency between field and laboratory measurements

More samples: JGJ 94-2008 NB/T 47013.2-2015 GB 18306-2015

Sample only — not a preview of GB/T 40965-2021

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