Magnetic Image or Apparent Change in the Measured Quantity in Magnetic Circuits with Variable Geometry of the Interpole Space
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Relation between the change in the intensity of the signal from the measured quantity and the magnetic state of the elements for concentrating the magnetic flux in the interpole space of an electromagnet is studied. The explanation suggested for the observed anomalies is based on consideration of the dependences of the permeability of the pole tips on the field magnetizing them. It is shown that in the case of an open magnetic circuit the contribution of the reaction of the material of the pole tips to the presence of the object studied changes, whereas in the case of partially closed of closed magnetic circuits the object is partially demagnetized due to the changes of the conditions of closure of the magnetic flux in the magnetic system formed by the object of the study and the flux guide of the electromagnet used. Dependences of the signal from the measured quantity on the magnetizing field are plotted for the magnetic circuits considered.
Key wordsmagnetic image magnetic circuit pole tip reaction of the material of pole tips principal and induced magnetic moments circuit closure and opening
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