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A portable apparatus for measuring the magnetic field strength in an electromagnetic wave

Published online by Cambridge University Press:  24 October 2008

L. G. Vedy  and
A. F. Wilkins
L. G. Vedy
Affiliation:
Downing College
A. F. Wilkins
Affiliation:
St John's College
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Extract

A portable apparatus is described which is capable of measuring directly, by means of a loop aerial, the magnetic field in an electromagnetic wave. Accurate measurements are possible of magnetic fields corresponding to field strengths of 0·2 millivolts per metre. Special means of providing small known calibrating E. M. F. S are described. The apparatus can be used to measure signals over the range 6 microvolts to 300 millivolts. Used in conjunction with a small portable vertical aerial, field strengths down to 2 microvolts per metre can be measured.

Type
Research Article
Information
Mathematical Proceedings of the Cambridge Philosophical Society , Volume 27 , Issue 3 , July 1931 , pp. 481 - 489
Copyright
Copyright © Cambridge Philosophical Society 1931

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References

* See, for example, Hollingworth, J., Journal I.E.E., Vol. 67, 1033 (1929)Google Scholar.

† See, for example, Friis, H. T. and Bruce, E., Proc. I.R.E., Vol. 14, 507 (1926)CrossRefGoogle Scholar.

* Nyman, A., Proc. I.R.E., Vol. 16, 208 (1928)CrossRefGoogle Scholar.

* Moullin, E. B., Radio Frequency Measurements, 2nd edition (1931), pp. 257 and 450.Google Scholar

* This statement implies that the measurements are made in a radiation field where H may be expressed in terms of the equivalent value of E.