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Positioning Control

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From scientific instrument to industrial machine

Part of the book series: SpringerBriefs in Electrical and Computer Engineering ((BRIEFSELECTRIC))

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Abstract

In an electron microscope positioning a sample with respect to the electron beam is performed by a motorized stage or by electromagnetic beam deflectors. At nano-scale many non-linear motion effects occur in the stage, of which the most obvious and annoying effect for an operator is the stick-slip effect. This chapter describes a novel and generic method that uses an optimized control system to provide good results in compensating for this effect. A second disturbing effect is the position drift, i.e. the slow movement of a sample relative to the electron beam. This chapter shows the results of our on-line control approach to compensate for position drift using the two positioning mechanisms. High frequency magnetic and mechanical disturbances that irrecoverably blur the image have to be dealt with in a different way. This chapter also describes an innovative approach to eliminate the adverse effects on the image by fast scanning combined with advanced image processing techniques.

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Notes

  1. 1.

    At least at temperatures above absolute zero.

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Correspondence to Richard Doornbos .

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Doornbos, R., van Loo, S. (2012). Positioning Control. In: Doornbos, R., van Loo, S. (eds) From scientific instrument to industrial machine. SpringerBriefs in Electrical and Computer Engineering(). Springer, Dordrecht. https://doi.org/10.1007/978-94-007-4147-8_7

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  • DOI: https://doi.org/10.1007/978-94-007-4147-8_7

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