Finding internal defects through coating flaws : Claridge, J. Glass International, Vol. 19, No. 4, pp. 51–52 (Dec. 1996)

Abstract

A recent order from the Ford Motor Co's Glass Division for an automatic laser system capable of inspecting coated float glass was the culmination of 12 months' intensive development activity at Image Automation. The problem had been to develop a system capable of finding flaws in the reflective coating itself, while still detecting tiny defects within the body of the ribbon. To solve the problem, it was necessary to return to the basic principles of optics and the properties of polarised light. This article explains