Patent ID: 6370221
Filing Date: 2002-04-09
Classification: G01N

Abstract:
A method of setting a position of an object of measurement in layer thickness measurement by X-ray fluorescence in which a beam of an optical recording device is projected into a beam of X-radiation and in which a surface of the object of measurement is recorded and output as an image comprising a number of image points, comprising the steps of:changing the distance between the surface and a collimator by an absolute amount of a path of movement, recording changes in brightness of image points in at least one measuring plane during at least one change of the distance between the surface and the collimator, ascertaining the maximum of the difference in brightness of the image points of an image after the at least one change of the distance, and setting the distance between the collimator and the surface of the object of measurement to the position of the ascertained maximum of the difference in brightness.