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

ASTM-E811 - 2009 R15 EDITION - CURRENT
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Standard Practice for Measuring Colorimetric Characteristics of Retroreflectors Under Nighttime Conditions
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Scope

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.

Significance and Use

5.1 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.5

Keywords

chromaticity; retroreflector;; ICS Number Code 93.080.30 (Road equipment and installations)

To find similar documents by ASTM Volume:

06.01 (Paint -- Tests for Chemical, Physical, and Optical Properties; Appearance)

To find similar documents by classification:

93.080.30 (Road equipment and installations Including road traffic warning and control systems, devices and installations (speed controls, traffic signal installations, vehicle loop detectors, pavement markers, manholes, etc.))

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Document Number

ASTM-E811-09(2015)

Revision Level

2009 R15 EDITION

Status

Current

Modification Type

Reapproval

Publication Date

July 1, 2015

Document Type

Practice

Page Count

8 pages

Committee Number

E12.10