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ASTM E809-21

Current Revision

Standard Practice for Measuring Photometric Characteristics of Retroreflectors

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1.1 This practice describes the general procedures for instrumental measurement of the photometric characteristics of retroreflective materials and retroreflective devices.

1.2 This practice is a comprehensive guide to the photometry of retroreflectors but does not include geometric terms that are described in Practice E808.

1.3 This practice describes the parameters that are required when stating photometric measurements in specific tests and specifications for retroreflectors.

1.4 The values stated in SI units are to be regarded as standard. The values given in parentheses after SI units are provided for information only and are not considered standard.

1.5 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.


5.1 This practice describes procedures used to measure photometric quantities that relate to the visual perception of retroreflected light. The most significant usage is in the relation to the nighttime vehicle headlamp, retroreflector, and driver's eye geometry. For this reason the CIE Standard Source A is used to represent a tungsten vehicle headlamp and the receptor has the photopic, V (λ), spectral responsivity corresponding to the light adapted human eye. Although the geometry must be specified by the user, it will, in general, correspond to the relation between the vehicle headlamp, the retroreflector, and the vehicle driver's eye position.

SDO ASTM: ASTM International
Document Number E809
Publication Date Jan. 1, 2021
Language en - English
Page Count 11
Revision Level 21
Supercedes
Committee E12.10
Publish Date Document Id Type View
Jan. 1, 2021 E0809-21 Revision
Jan. 1, 2008 E0809-08 Revision
June 10, 2002 E0809-02 Revision
Jan. 1, 2013 E0809-08R13 Reaffirmation
Jan. 1, 2000 E0809-94AR00 Reaffirmation