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2010 IEEE International Symposium on Industrial Electronics
This paper deals with an experimental procedure to illustrate the problems introduced by ferromagnetic hysteresis present in magnetic lenses of electron microscopes. The magnetic flux density is not available as a measurable quantity. Hysteresis expresses itself in the relation between the input current applied to the lens-coil and the level of sharpness (defocus) of the resulting images. The familiar hysteresis loops are not available, instead we measure hysteresis in the so-called butterflydoi:10.1109/isie.2010.5637564 fatcat:dcymqtvbtjaelavplsdbfkfnty