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

Claim 10:
11. The method of claim 1, wherein the surface is a first cross-section surface of the sample having x, y and z dimensions corresponding respectively to the first, second and third dimensions, with the at least two reference fiducials corresponding to first and second linear fiducials each having ends electronically detectable on the first cross-section surface of the sample defined by the x-y plane and each extending from the surface in a direction having the z-dimension component at known angles relative to the x-y surface, and determining the second drift compensation includes
exposing a second cross-section surface defined by the x-y plane after milling the sample to a selected depth, where an x dimension distance between ends of the first and second linear fiducials exposed in each cross-sectioned surface changes as a function of the z-dimension;
electronically calculating an actual milled depth in the z-dimension between the first cross-section surface and the second cross-section surface based on a change in the x dimension distance and the angles;
adjusting parameters to change the rate of advancement of the second charged particle beam in the z dimension effective for exposing a third cross-section surface at approximately the actual milled depth in the z dimension from the second cross-section surface.