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Removal of an inconsistency in the theory of diffraction

Published online by Cambridge University Press:  24 October 2008

D. S. Jones
D. S. Jones
Affiliation:
Department of MathematicsUniversity of manchesterCommunicated by D. R. Taunt
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Abstract

It is indicated by means of a particular example how an inconsistency arises in one formulation of diffraction problems. It is shown that the inconsistency is removed if different boundary conditions are imposed during the formulation. In the proof it is necessary to determine the contributions to the field from parts of a sphere of radius R at an interior point when the field on the sphere is a plane wave. It is found that, as R → ∞, the part of the sphere near the source which subtends a solid angle of order at the centre contributes the plane wave and that the remainder of the sphere provides a contribution which vanishes in the limit. The demonstration involves the use of the principle of stationary phase for an integral of two variables.

In the final section special boundary conditions are given for an exceptional three-dimensional problem.

Type
Research Article
Information
Mathematical Proceedings of the Cambridge Philosophical Society , Volume 48 , Issue 4 , October 1952 , pp. 733 - 741
Copyright
Copyright © Cambridge Philosophical Society 1952

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References

REFERENCES

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