METHOD AND APPARATUS FOR MEASURING THE THICKNESS OF AN ARTICLE AT A PLURALITY OF POINTS

摘要

A method and apparatus (10) for measuring the thickness of an article (12) comprises providing a table (18) having a plurality of thickness references (30) at a first end (36) and with openings (22) for access to the lower surface of the article (12) on the table. A plurality of pairs of opposed sensors are mounted on a carriage (44) that extends across the width of the table (18) and is adapted for movement in the longitudinal direction of the table. One member (46) of each pair of sensors is above the table opposite a second member (48) that is below. The carriage (18) is positioned at a first location where each pair of sensors measures the thickness of the thickness reference with which it is aligned. The carriage then is stepwise moved to one or more subsequent locations to measure the thickness of the article at such locations.