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uScope Navigator (Scan)

Predictive Focus Settings
uScope Navigator (Scan)

Information in this article applies to:

  • uScope Navigator V4.3 and Later

Article ID: NSC1137 — Created: 29 Jan 2018 — Reviewed: 2 Feb 2018

Question

What predictive focus method settings are available and how are they used?

Answer

Predictive Focus Settings Prior to uScope Navigator v4.3, the only predictive focus setting was the grid spacing which specified the maximum number of fields between prediction points.

Starting in uScope Navigator v4.3, predictive focus was enhanced as follows:

  • Prediction point scanning is now bidirectional (it was previously uni-directional). This speeds up prediction point acquisition.
  • After the initial prediction point is acquired, subsequent prediction points use the previous prediction point focus value as the mid-point of their focus scan. This has the effect of capturing prediction points more quickly.
  • Option settings allow user configuration of the initial prediction point range, the step size, and the range for subsequent prediction point focus.

Note
The step size specifies the number of motor steps to move the objective (0.1375 microns per step). So, 10 steps is 13.75 microns. The step range specifies the range (in motor steps) above and below a mid-point. So, a step range of 100 is equivalent to 201 steps in total (100 motor steps above and 100 motor steps below a mid-point).

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