ASTM E811-09
Standard Practice for Measuring Colorimetric Characteristics of Retroreflectors Under Nighttime Conditions

Standard No.

ASTM E811-09

Release Date

2009

Published By

American Society for Testing and Materials (ASTM)

Status

Be replaced

Replace By

ASTM E811-09(2015)

Latest

ASTM E811-09(2020)e1

Scope

This practice describes a procedure for measuring the chromaticity of retroreflectors in a nighttime, that is, retroreflective, geometry of illumination and observation. CIE Standard Source A has been chosen to represent a tungsten automobile headlamp. Although the geometry must be specified by the user of this practice, it will, in general, correspond to the relationship between the vehicle headlamp, the retroreflector, and the vehicle driver''s eyes. Thus, the chromaticity coordinates determined by the procedures in this practice describe numerically the nighttime appearance of the retroreflector.

1.1 This practice describes the instrumental determination of retroreflected chromaticity coordinates of retroreflectors. It includes the techniques used in a photometric range to measure retroreflected (nighttime) chromaticity with either a telecolorimeter or telespectroradiometer.

1.2 This practice covers the general measurement procedures. Additional requirements for specific tests and specifications are described in Section 7.

1.3 The description of the geometry used in the nighttime colorimetry of retroreflectors is described in Practice E808 and the methods for calculation of chromaticity are contained in Practice E308.

1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

ASTM E811-09 Referenced Document

• ASTM E284 Standard Terminology of Appearance
• ASTM E308 Standard Practice for Computing the Colors of Objects by Using the CIE System
• ASTM E691 Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
• ASTM E808 Standard Practice for Describing Retroreflection
• ASTM E809 Standard Practice for Measuring Photometric Characteristics of Retroreflectors

ASTM E811-09 history

• 2020 ASTM E811-09(2020)e1 Standard Practice for Measuring Colorimetric Characteristics of Retroreflectors Under Nighttime Conditions
• 2009 ASTM E811-09(2015) Standard Practice for Measuring Colorimetric Characteristics of Retroreflectors Under Nighttime Conditions
• 2009 ASTM E811-09 Standard Practice for Measuring Colorimetric Characteristics of Retroreflectors Under Nighttime Conditions
• 1995 ASTM E811-95(2001) Standard Practice for Measuring Colorimetric Characteristics of Retroreflectors Under Nighttime Conditions
• 2001 ASTM E811-95 Standard Practice for Measuring Colorimetric Characteristics of Retroreflectors Under Nighttime Conditions