Instrument for reflectivity measurement

摘要

An apparatus for testing the reflectivity of a material under test includes a rotating carriage, a light source, and a light detector. At least two sample units are mountable to the rotating carriage. Each sample unit includes a planar surface disposed under a portion of a hemispherical surface. The light source is mounted on a pivoting boom and generates light. The light detector is mounted to measure optical power of the light emitted from the light source and reflected from a selected one of the at least two sample units. The pivoting boom and the rotating carriage rotate through different angular positions to obtain reflectance signatures as a function of incident angles for the at least two sample units.

主权项

1. An apparatus for testing the reflectivity of a material under test (“MUT”), comprising:
a rotating carriage configured to receive and to mount one or more sample units, each including a planar surface disposed under a portion of a hemispherical surface; a light source to generate light; and a light detector mounted to measure optical power of the light emitted from the light source and reflected from a selected one of the one or more sample units, wherein the light source and the rotating carriage rotate through different angular positions to obtain reflectance signatures as a function of incident angles for the one or more sample units, wherein the light source is mounted to rotate about a pivoting axis that is coplanar with the planar surface of the selected one of the one or more sample units and an optical path of the light emitted by the light source is approximately normal to the hemispherical surface of the selected one of the one or more sample units.