SELF

38

S.B. Karavashkin and O.N. Karavashkina

Conclusions

We have studied the methods to visualise the dynamic EM fields and showed, there is no direct necessity to use the method to plot the force either equipotential lines whose application involves many mathematical difficulties.

The method of deforming grid applied in order to visualise the dynamic scalar potential of dipole has shown the following:

a) the field of dipole has the structure of progressive wave both in the near and far fields;

b) transverse wave is formed in the region of junction of half-waves of scalar potential and propagates in some sector with the axis on the normal to the line of dipole charges;

c) in this region the curl of gradient of scalar potential is not zero.

We showed that distinctions seen between the visualised patterns of EM field, conventional experimental data and patterns of physical process plotted on these data have the cause that in the existing experimental methods the field strength is measured by the measuring dipole having finite length.

We also showed that the localisation of radiation field in the normal to the line of dipole charges, appearing inversion of field strength on the periphery of the indicated region of radiation field and non-indication of longitudinal component of field are the corollary of this feature of conventional methods.

The direction diagrams plotted with the account of finite size of measuring dipole reveal the appearance of fictitious side lobes much distorting the amplitude and phase characteristics of the main lobe of diagram. In transition to the far field, the virtual lobes of directional diagram vanish.

We studied the wave velocity variation in the near field and showed that the velocity increases in the near field because of the distanced affection of charges on the formation of radiation delay phases.

We applied the method of visualisation with the deforming grid to study the field of acoustic dipole. We corroborated that an acoustic dipole radiates the waves with the same properties that are inherent in transverse waves of electric dipole. This shows that to carry transverse waves, the medium does not need to have the properties of shear deformation, as it was thought before.

References:

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