Inventors:
Charles J. Cushing - Charlotte NC
Clifton W. Phillips - Charlotte NC
Richard D. VanderNeut - Charlotte NC
Assignee:
Ford Aerospace & Communications Corp. - Detroit MI
International Classification:
G01N 2186
Abstract:
A flying spot scanner is utilized to scan a beam of laser radiation along a fixed spacial path on a moving web material. An optical detector assembly is positioned to receive radiation reflected from individual elements of the web to produce an electrical signal which is processed to determine and monitor the number of the individual web elements per unit length.