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Apparatus for measuring electrical or magnetic fields by absorption spectrum change

  • US 4,356,448 A
  • Filed: 05/23/1980
  • Issued: 10/26/1982
  • Est. Priority Date: 05/31/1979
  • Status: Expired due to Term
First Claim
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1. An optical measuring device for measuring magnetic fields, comprising:

  • at least one radiation modulator consisting of a material having spectral properties dependent on said field;

    means for measuring said spectral properties by radiation in a given wavelength range passing through said modulator, said modulator, in said given wavelength range, having at least one absorption edge in the absorption sprectrum of said material being modified by application of said field, said field dependence being caused by changes in the Landau levels in a magnetic field;

    at least one optical fiber for conducting light to and from the modulator; and

    said material having a specific resistivity at least as great as that of a semiconductor material.

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