Patent ID: 11923168
Assignee: FIBICS INCORPORATED
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  G | IPC H

Claim 6:
7. The method of claim 1, wherein the operation includes controlling the first charged particle beam to scan a new surface of the sample to obtain an image thereof, the steps of identifying and determining the first drift compensation are executed during the operation, and determining the first drift compensation includes
monitoring the one of the at least two reference fiducials from a start time to an end time:
calculating a drift factor function as an amount of drift by the one of the at least two reference fiducials at points between the start time and the end time,
calculating a total drift for the time required to raster the new surface based on the drift factor function, and
correcting for the total drift to further shift the first charged particle beam for each pixel during rastering of the new surface by dividing the total drift by the total number of dwell periods to arrive at a drift correction per dwell period position, and
adjusting the position of the first charged particle beam includes applying the drift correction per pixel to each dwell period position for the new surface.