Patent ID: 6790123
Filing Date: 2004-09-14
Classification: B24B,H01L

Abstract:
A method for reconstructing the surface topology of a product work piece having a layer deposited thereon by a deposition apparatus, the method comprising the steps of:providing a blank work piece having a blanket layer deposited on a surface thereof by the deposition apparatus; measuring the thickness of the blanket layer at a first plurality of locations, each of the first plurality of locations characterized by a radial position, to determine a first plurality of data points of thickness of the blanket layer as a function of radial position on the surface; interpolating between the first plurality of data points to determine a continuum of interpolated thickness of the blanket layer as a function of radial position; providing a product work piece having a deposited layer thereon, the deposited layer deposited in the deposition apparatus; measuring the thickness of the deposited layer at a second plurality of locations, each of the second plurality of locations characterized by a radial position on the product work piece; calculating the ratio of the thickness of the deposited layer at each of the second plurality of locations to the interpolated thickness of the blanket layer at a corresponding radial position to determine a second plurality of data points of ratio as a function of radial position; interpolating between the second plurality of data points to obtain a continuum of interpolated ratios as a function of radial position; and multiplying the first plurality of data points of thickness by the interpolated ratios at corresponding radial positions to reconstruct the surface topology of the product work piece.