Standard Test Method for Coefficient of Retroreflection of Retroreflective Sheeting Utilizing the Coplanar Geometry

Importancia y uso:

5.1 Measurements made by this test method are related to visual observations of retroreflective sheeting as seen by the human eye when illuminated by tungsten-filament light sources such as a motor vehicle headlamp.

5.2 The values determined relate to the visual effects for a given geometric configuration as specified by the user of the test method. This test method has been found useful for tests at observation angles between 0.1° and 2.0° (observation angles between 0.1° and 0.2° may be achieved by careful design of source and receiver aperture configuration), and at entrance angles up to 60°. It has been used to determine coefficient of retroreflection values as low as 0.1 cd·lx⁻¹ · m⁻², but for values less than 1 cd·lx⁻¹ · m⁻² special attention must be given to the responsivity of the receiver and to the elimination of very small amounts of stray light.

Subcomité:

E12.10

Referida por:

D4956-19, E0179-17R22, D4956-19, E3165-18R25, E2540-16R22, D8514_D8514M-23, E1709-16R22

Volúmen:

06.01

Número ICS:

17.180.20 (Colours and measurement of light)

Palabras clave:

coefficient of retroreflection; light—transmission and reflection; retroreflection/retroreflectors; retroreflective sheeting;