Optical fiber sensor for measuring a magnetic field or electric

Details Optical fiber sensor for measuring a magnetic field or electric Optical fiber sensor for measuring a magnetic field or electric

1996-04-03

1998-03-24

Palmer, Phan T. H.

Optical waveguides

Optical waveguide sensor

385 4, 385 6, 385 1, 385 9, 3242441, G02B 600

Patent

active

057321671

ABSTRACT:
An optical fiber sensor which is adapted for use in combination with a horseshoe-type iron core comprises a substrate having a groove pattern established by a pair of elongated spaced, parallel grooves, and a third groove which intersects the paired grooves at right angles. An optical fiber having a U-shaped portion is inserted into and fixed in the groove pattern, and an optical modulation unit, which is fixedly provided in a light path of the optical fiber, is placed in the third groove. The substrate is a composite which comprises a non-magnetic portion and soft magnetic portions fixed to either side of the non-magnetic portion. The paired elongated grooves are formed in the soft magnetic portions, while the optical modulation unit is fixed to the non-magnetic portion. A method for making such a composite substrate is also described.

REFERENCES:
patent: 4962990 (1990-10-01), Matsuzawa et al.
patent: 5202629 (1993-04-01), Seike et al.
"Fiber -Optic Monitoring Sensor System for Power Distribution Lines" by D. Ishiko et al, National Technical Report vol. 38, No. 2, pp. 255-261 (1992) Apr.
"Submicroampere-per-root-hertz current sensor based on the Faraday effect in Ga:YIG" by A.H. Rose, et al, Optics Letters Vo. 18, No. 17, pp. 1471-1473 (1993) Apr.
"Polarization-Independent In-Line Optical Insolator with Lens-Free Configuration" by Shiraishi et al, Journal of Lightwave Technology, vol. 10, No. 12, pp. 1839-1842 (1992) No Month.

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