Patent ID: 8037736
Filing Date: 2011-10-18
Classification: B82Y,G01B,G01Q

Abstract:
1. A method comprising: providing a probe of a measurement tool coupled to a positioning scanner; scanning a surface of a sample with the surface at a first angle relative to the probe to attain a first profile, wherein the first angle is substantially 90° relative to the probe; scanning the surface of the first sample with the surface at a second angle relative to the probe that is different than the first angle to attain a second profile, the second angle being able to be any angle that results in a predetermined amount of lateral travel of the probe; repeating the scannings to attain a plurality of first profiles and a plurality of second profiles; and determining a non-linearity of the positioning scanner using the different scanning angles to cancel out measurements corresponding to imperfections due to the surface of the sample.