Directional reflectometer for measuring optical bidirectional re

Details Directional reflectometer for measuring optical bidirectional re Directional reflectometer for measuring optical bidirectional re

1995-06-07

1997-06-10

Gonzalez, Frank

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

2503418, 250352, 356 51, 356446, G01J 502, G01N 2147

Patent

active

056378734

ABSTRACT:
The present invention is a directional reflectometer that measures the optical bidirectional reflectance distribution function [BRDF] of a surface in situ on a finished article, e.g. a vehicle, to provide information on its surface emissivity. The light wavelength may be IR, near-IR or visible. Light, preferably focused to a small spot on the surface, is projected onto the surface at an angle adjustable in azimuth and elevation. A wide angle mirror and/or lens system transfers light scattered from the surface onto an imaging sensor, preserving scattering angle information and thereby permitting the BRDFs for a given incidence angle and all scattering angles to be measured simultaneously. A hand held or laptop computer sets the incidence angle, reads the sensor outputs and renders judgments on the quality of the surface in a factory or field environment.

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