Retroreflector mirror

where E┴ is the illuminance on a plane normal to the direction of illumination, and I is the intensity of the illuminated retroreflector.

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Retroreflectors are often specified by the coefficient of retroreflection, RA, for various observation angles and entrance angles.

Retro ReflectorTape

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Another useful angle for interpreting the performance of retroreflectors is the viewing angle, υ, the angle between the viewing direction and the normal to the retroreflector surface.

Retro reflectorsensor

retro-reflector on moon

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Two angles commonly used to specify the performance of retroreflectors are the entrance angle, ß, and the observation angle, α. The entrance angle is the angle between the illumination direction and the normal to the retroreflector surface. High-quality retroreflectors work over fairly wide entrance angles, up to 45-deg or more (up to 90 deg for pavement marking). The observation angle, the angle between the illumination direction and the viewing direction, is generally very small, often one degree or less.

Retroreflective panels

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The performance of retroreflectors is characterized within a geometrical coordinate system, usually with three angles for the incident and viewing geometries and a fourth orientation angle for prismatic designs like corner cubes, which are not rotationally isotropic in their performance. All the geometric variations are described in detail in ASTM E808-01, Standard Practice for Describing Retroreflection, along with expressions for converting from one geometric system to another.

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Values for RA of several hundred (cd/m2)/lux are not uncommon, corresponding to reflectance factors up to and over 1000.

Retroreflectors reflect incident light back toward the direction of the light source, operating over a wide range of angles of incidence. Typically they are constructed in one of two different forms, 90-deg corner cubes or high index-of-refraction transparent spheres with a reflective backing. Retroreflectors are used in transportation systems as unlighted night-time roadway and waterway markers, as well as in numerous optical systems, including lunar ranging. Some are made of relatively inexpensive plastic pieces or flexible plastic sheeting, and some are made of high-priced precision optics.

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