Patent ID: 8502144

Claim:
A system for controlling a tool-to-tool disparity between a plurality of scanning electron microscopes, comprising: a measuring unit for measuring a tool-to-tool disparity between plural scanning electron microscopes based on information extracted from secondary electron images which are captured by imaging a reference pattern, formed on a reference wafer on which a pyramid pattern, a repeated pattern, and a dense pattern having edges in all radial directions are formed as the reference pattern including line, hole, and dot patterns by using each of said plural scanning electron microscopes; a tool state monitoring unit for monitoring tool states of each of said plural scanning electron microscopes including at least one of a deflector lens current and an objective lens current of each of said plural scanning electron microscopes; and an output unit for displaying on a screen a relationship between said tool-to-tool disparity between said plural scanning electron microscopes measured by said measuring unit and tool states of each of said plural scanning electron microscopes monitored by said tool state monitoring unit; wherein said tool state monitoring unit monitors the tool states of each of said plural scanning electron microscopes while imaging said reference pattern by using each of said plural scanning electron microscopes.