Fiber optic magnetic field sensor

Details Fiber optic magnetic field sensor Fiber optic magnetic field sensor

1984-06-25

1987-03-17

Sikes, William L.

Optics: measuring and testing

Range or remote distance finding

With photodetection

350 9610, 350 9629, 350 9630, 350 9634, 356149, 324244, 324260, G02B 622, G01C 110, G01N 2772

Patent

active

046502815

ABSTRACT:
A magnetically sensitive optical fiber is described. Specifically, this fiber is comprised of a central core containing magnetostrictive material and an optical waveguide, having an optical ring core and inner- and outer-glass cladding layers, clad to the central core. The core is constructed from magnetostrictive material which is readily and inexpensively available as wire of various gauges. The wire is chosen to have a relatively large cross-sectional area with respect to that of the glass cladding layer(s). The resulting optical fiber is advantageously highly sensitive to weak magnetic fields and is also both simple and inexpensive to manufacture.

REFERENCES:
patent: 3445666 (1969-05-01), Snaper
patent: 3701131 (1972-10-01), Brauser et al.
patent: 4371838 (1983-02-01), Griscom
patent: 4433291 (1984-02-01), Yariv et al.
Yariv et al., "Proposal for Detecting of Magnetic . . . Fibers", Optics Lett., vol. 5, No. 3, 3/80, pp. 87-89.
Dandridge et al., "Optical Fibre Magnetic Field Sensors", Electronics Lett. vol. 16, No. 11, 3/80.
Tangonan et al., "Current Sensing with Metal Coated . . . Fibres", Electronics Lett., 10/80.
Taylor et al., "Fiber Optic Sensors", Proceedings of 1st Eur Conf. on Int. Optics, 1981.
Giallorenzi, "Fibre Optic Sensors", Optics and Laser Technology, Apr. 1981, pp. 73-78.
Trowbridge et al., "Metallic-Glass Fiber-Optic Phase Modulators", Optics Lett, vol. 6, No. 12, 12/81, pp. 636-638.
Davis, "Introduction to Fiber Optic Sensors", Fiberoptic Technology, 2/82, pp. 112-115.

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