Patent ID: 7253904
Filing Date: 2007-08-07
Classification: G01N

Abstract:
1. Process for determining the alliation percentage of a galvanized steel strip product in-line during a feed of the product during manufacture, comprising the steps of exposing a zone of a surface of the product to incident radiation directed orthogonally to the surface and measuring, also in a direction orthogonal to the surface, the radiation energy reflected by the exposed zone, said exposing step comprising illuminating said zone by a lighting optical fibre having a stripped free end and connected to an incident radiation emission source with a predetermined wavelength and said measuring step comprising measuring the reflected radiation by means of a measuring optical fibre having a stripped free end and connected to a sensor, and wherein the process includes holding the stripped free ends in the immediate vicinity of each other and parallel to each other and perpendicularly to the surface of the product during said exposing and measuring steps, wherein the measuring step comprises also measuring the reflected radiation in at least one direction oblique to the surface of the product, at an angle between 10 and 30 degrees from the perpendicular to the surface, to evaluate the energy diffused by the illuminated zone.