High accuracy mapping of magnetic fields with a fiber optic inte

Details High accuracy mapping of magnetic fields with a fiber optic inte High accuracy mapping of magnetic fields with a fiber optic inte

1986-09-24

1988-05-03

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Magnetometers

324260, 350 961, G01R 33032, G02B 602

Patent

active

047423005

ABSTRACT:
A method of mapping at least a portion of a magnetic field with an interferometer is presented. The interferometer includes an optical fiber clad with a magnetostrictive material. The approximate direction of the magnetic field lines are determined and the optical fiber is placed substantially transverse to the magnetic field lines. The output of the interferometer is recorded for various positions of the optical fiber. The fiber can be maintained substantially transverse to the magnetic field lines during mapping, or the fiber can be positioned substantially transverse to the field lines to precisely determine the direction of field lines and substantially parallel to the field lines to determine field magnitude. In one embodiment the interferometer is adapted to produce a null output for a predetermined value of the integral of the magnetic field along the length of the optical fiber, and the optical fiber is of uniform construction. In this embodiment, the loci of reference points corresponding to null outputs provides a mapping of points of symmetry in the magnetic field. The direction of magnetic field lines at a point in space is also determined by seeking the minimum output of the interferometer by scanning about the point with the optical fiber.

REFERENCES:
patent: 2248101 (1941-07-01), Lohman
patent: 2288876 (1942-07-01), Arnold
patent: 2519094 (1950-08-01), Zuschlag
patent: 3188560 (1965-06-01), Hings
patent: 4376248 (1983-03-01), Giallorenzi et al.
patent: 4433291 (1984-02-01), Yariv et al.

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