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Calibration Specification for Retroreflectometers
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Basic data
| Standard ID | JJF 1809-2020 (JJF1809-2020) |
| Description (Translated English) | Calibration Specification for Retroreflectometers |
| Sector / Industry | Metrology & Measurement Industry Standard |
| Classification of Chinese Standard | A60 |
| Classification of International Standard | 17.180 |
| Word Count Estimation | 28,265 |
| Date of Issue | 2020 |
| Date of Implementation | 2020-04-17 |
| Issuing agency(ies) | State Administration for Market Regulation |
JJF 1809-2020: Calibration Specification for Retroreflectometers
---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
(Calibration specification for retroreflective measuring instrument)
National Metrology Technical Specifications of the People's Republic of China
Calibration specification for retroreflectometer
2020-01-17 released
2020-04-17 implementation
Issued by the State Administration for Market Regulation
Calibration specification for retroreflectometer
Focal point. National Technical Committee of Special Measuring Instruments for Highways
Main drafting unit. Institute of Highway Science, Ministry of Transport
Participated in the drafting. National Road and Bridge Engineering Testing Equipment Metering Station
National Transportation Safety Facilities Quality Supervision and Inspection Center
This specification entrusts the National Highway Special Measuring Instruments Metrology Technical Committee to be responsible for interpretation
The main drafters of this specification.
Su Wenying (Institute of Highway Science, Ministry of Transport)
He Huayang (Institute of Highway Science, Ministry of Transport)
Zhou Yishu (Institute of Highway Science, Ministry of Transport)
Participating drafters.
Leng Zhengwei (National Road and Bridge Engineering Testing Equipment Measuring Station)
Bai Yuanyuan (National Transportation Safety Facilities Quality Supervision and Inspection Center)
Wang Rui (National Road and Bridge Engineering Testing Equipment Measuring Station)
Zhu Jing (National Road and Bridge Engineering Testing Equipment Measuring Station)
table of Contents
Introduction (Ⅱ)
1 scope (1)
2 Reference documents (1)
3 Terms and definitions (1)
3.1 Retroreflection (1)
3.2 Luminous intensity coefficient (1)
3.3 Retroreflective coefficient (1)
3.4 Retroreflective brightness coefficient (1)
4 Overview (1)
5 Measurement characteristics (2)
5.1 Indication error (2)
5.2 Measurement repeatability (2)
6 Calibration conditions (3)
6.1 Environmental conditions (3)
6.2 Calibration equipment (3)
7 Calibration items and calibration methods (3)
7.1 Indication error (3)
7.2 Measurement repeatability (3)
8 Calibration results (4)
8.1 Calibration record (4)
8.2 Calibration certificate (4)
8.3 Evaluation of Uncertainty of Calibration Results (4)
9 Recheck interval (4)
Appendix A Calibration record form of retroreflective measuring instrument (5)
Appendix B Calibration Certificate Information and Inner Page Style of Retroreflective Measuring Instrument (10)
Appendix C Examples of Evaluation of Uncertainty in Calibration of Retroreflective Measuring Instruments (15)
Introduction
JJF 1071-2010 "Rules for the Compilation of National Metrology and Calibration Specifications", JJF 1059.1-2012 "Measuring Uncertainty
"Assessment and Representation" together constitute a basic series of specifications that support the formulation of this specification.
This specification is released for the first time.
Calibration specification for retroreflectometer
1 Scope
This specification applies to the calibration of retroreflective measuring instruments.
2 Reference documents
This specification refers to the following documents.
JJF 1059.1 Evaluation and expression of measurement uncertainty
JJF 1796 Retroreflective Standard
JT/T 688-2007 Retroreflective terminology
JT/T 690 Retroreflector photometric performance test method
For dated reference documents, only the dated version applies to this specification; for undated reference documents,
The latest version (including all amendments) is applicable to this specification.
3 Terms and definitions
The terms and definitions defined in JT/T 688-2007 and below apply to this specification.
3.1 retroreflection
Reflected light is a kind of reflection that returns from the opposite direction close to the incident light.
[JT/T 688-2007,2.1]
3.2 RI coefficientofluminousintensity
The luminous intensity (I) of the retroreflector in the observation direction is the same as the light on the plane perpendicular to the direction of the incident light.
The ratio of illuminance (E┴), the unit is candela per lux (cd·lx-1).
[JT/T 688-2007,2.34]
3.3 RA coefficientofretroreflection
The ratio of the luminous intensity coefficient to the surface area of the retroreflector, the unit is candela per lux square meter (cd·lx-1·m-2).
[JT/T 688-2007,2.35]
3.4 RL coefficientofretroreflectedluminance
The ratio of the brightness L in the observation direction to the normal illuminance on the plane perpendicular to the direction of the incident light, the unit is Kande
Pull lux per square meter (cd·m-2·lx-1).
[JT/T 688-2007,2.37]
4 overview
The retroreflective measuring instrument is used to measure traffic safety such as traffic signs and reflective films, road traffic markings, and raised road signs.
A portable optical device with full facility luminosity performance, used with retroreflective standard. The measurement principle is
The alternative method specified in JT/T 690 can be used for both laboratory measurement and engineering site measurement.
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