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

Claim 8:
9. The method of claim 1, wherein the operation includes controlling the first charged particle beam to scan the 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 further includes
pausing the scanning of the surface of the sample,
monitoring the time (t) and the first and second dimension position (X,Y) of the one of the at least two reference fiducials from the start time after pausing to the end time after pausing,
wherein determining the first drift compensation includes
calculating a drift factor function (dX, dY, t) by fitting the amount of observed drift by the one of the at least two reference fiducials at points between each of at the least one start time and the end time pairs and fitting these points to a suitable pre-determined model, and
calculating the time at which each pixel is rastered in a subsequent portion of the cross-section surface, and

wherein adjusting the position of the first charged particle beam includes dynamically correcting for the drift by applying drift correction per pixel obtained from the drift factor function (dX, dY, t) to the (X,Y) position of each pixel during rastering based on the time during which each pixel is dwelled for the subsequent portion of the surface, and resuming image acquisition at the portion of the surface when the pausing occurred using the applied drift correction.