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Temperature compensated optical fiber interferometric magnetometer

  • US 4,609,871 A
  • Filed: 07/02/1984
  • Issued: 09/02/1986
  • Est. Priority Date: 07/02/1984
  • Status: Expired due to Fees
First Claim
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1. An interferometric device for measuring the strength of a magnetic field independent of variations in ambient temperature, comprising:

  • a source of coherent light signals;

    means, optically coupled to said source, for splitting the light signals therefrom into two subsignals of equal amplitude, frequency, and phase;

    a magnetostrictive rod adapted to be sensitive to variations only in the magnetic field component along its length;

    a first optical fiber coiled and bonded contiguously and transversely about said rod, and optically coupled at one end to receive one subsignal from said splitting means;

    two convex caps, each attached to the ends of said rod;

    a second optical fiber coiled and bonded contiguously about said caps in a direction along the longitudinal axis of said rod, and optically coupled at one end to receive the second subsignal from said splitting means;

    means, optically coupled to the other end of said first and second fiber, for recombining the subsignals therefrom into a signal the intensity of which varies in proportion to the magnetic field of interest;

    photodetector means, optically coupled to said recombining means, for receiving the recombined signal and converting it into a substantially equivalent electrical signal; and

    processing means, connected to said photodetector means, for determining the strength of the magnetic field.

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