Patent ID: 9097645
Filing Date: 2015-08-04
Classification: G01B,G01N,H01L

Abstract:
1. A system for high speed height control of a surface of the substrate within a wafer inspection system comprising: a dynamically actuatable substrate stage assembly including a substrate stage for securing a substrate; an actuator configured to actuate the substrate along a direction substantially perpendicular to the surface of the substrate; a height error detection system configured to measure height error of a surface of the substrate at a position of inspection of the surface; a displacement sensor operably coupled to the substrate stage assembly and configured to measure a displacement substantially perpendicular to the surface of the substrate at the location of the substrate stage assembly; a feedback control system communicatively coupled to the height error detection system and the actuator, wherein the feedback control system is configured to: a feed forward control system communicatively coupled to the height error detection system and the actuator, wherein the feed forward control system is configured to: