ASTM E811-09 (R2020)e1 PDF Download
Standard EN
Standard Practice for Measuring Colorimetric Characteristics of Retroreflectors Under Nighttime Conditions
Also Known As:
ASTM E811-09 (R2020)e1 is a standard practice that outlines the procedure for measuring the colorimetric characteristics of retroreflectors under nighttime conditions. The purpose of this practice is to determine the chromaticity coordinates of retroreflectors in a nighttime geometry of illumination and observation, specifically representing the relationship between the vehicle headlamp, retroreflector, and the driver's eyes.
The standard utilizes CIE Standard Source A, which represents a tungsten automobile headlamp, to measure the chromaticity of retroreflectors. This practice can be performed using either a telecolorimeter or a telespectroradiometer in a photometric range.
The standard provides general measurement procedures, and specific requirements for different tests and specifications are described in Section 7. The geometry used in the nighttime colorimetry of retroreflectors is described in Practice E808, and the calculation methods for chromaticity are outlined in Practice E308.
| Descriptors | chromaticity, colorimetric analysis, telespectroradiometers, reflectance, telecolorimeters, retroreflectors, ,Color,Colorimeters,Colorimetry,Measuring Instruments,Reflectance and Reflectivity,Safety Markings |
| ICS Codes | 93.080.30 - Road equipment and installations |
| Language(s) | English |
| File Size | 143.4 KB |
