Retroreflectometer

Details Retroreflectometer Retroreflectometer

1980-06-09

1983-01-18

Arnold, Bruce Y.

Optics: measuring and testing

Of light reflection

250224, G01N 2101

Patent

active

043689825

ABSTRACT:
Apparatus and methods for measuring retroreflective properties of a surface are disclosed. The apparatus and methods are characterized in that the measured angle of divergence is varied while the angle of incidence is simultaneously varied.

REFERENCES:
patent: 3214596 (1965-10-01), Schwerdt, Jr., et al.
patent: 3229564 (1966-01-01), Meltzer
patent: 3782827 (1974-01-01), Nisenson et al.
patent: 4097751 (1978-06-01), Egan et al.
patent: 4125328 (1978-11-01), Suga
patent: 4201474 (1980-05-01), Holl et al.

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