Method and apparatus for determining directional variation of shade of pile and napped materials

摘要

This invention relates to a method and apparatus for determining directional variation of shade of pile or napped materials. This directional variation of shade can be determined in multiple directions either simultaneously or sequentially utilizing spectrophotometers with bifurcated fiber optic cables. The bifurcated fiber optic cable is repeatably and accurately positioned over the pile or napped materials. A typical non-limiting example of pile materials includes carpeting.