Optical fiber having a helical core for sensing a magnetic field
First Claim
1. Apparatus for sensing a magnetic field comprising a single-mode optical fibre structure having a central longitudinal axis and exhibiting sufficiently high circular birefringence for substantially quenching an influence of linear birefringence, said fibre structure including a single-mode waveguiding region, a longitudinal axis of which forms a helix around the central longitudinal axis of said fibre structure, with an offset of said longitudinal axis of said waveguiding region from said central longitudinal axis of said fiber structure being in the range of 10-300 μ
- m and said helix having a pitch in the range of 0.1-10 mm.
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Accused Products
Abstract
A sensor for sensing magnetic fields. A single mode optical fiber has a core which is wound into a helical shape. The fiber is formed with a former and a core, and the core is preferably attached to the inner surface of the former and wound into a helical shape tracing its inner periphery. The core is also offset from the central axis of the fiber former.
37 Citations
6 Claims
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1. Apparatus for sensing a magnetic field comprising a single-mode optical fibre structure having a central longitudinal axis and exhibiting sufficiently high circular birefringence for substantially quenching an influence of linear birefringence, said fibre structure including a single-mode waveguiding region, a longitudinal axis of which forms a helix around the central longitudinal axis of said fibre structure, with an offset of said longitudinal axis of said waveguiding region from said central longitudinal axis of said fiber structure being in the range of 10-300 μ
- m and said helix having a pitch in the range of 0.1-10 mm.
- View Dependent Claims (2, 3, 4, 5)
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6. An electric current sensor apparatus for sensing an electric current, comprising a magnetic field sensing device that has a single-mode optical fibre structure having a central longitudinal axis and exhibiting sufficiently high circular birefringence for substantially quenching an influence of linear birefringence, said fibre structure including a single-mode waveguiding region, a longitudinal axis of which forms a helix around the central longitudinal axis of said fibre structure, with an offset of said longitudinal axis of said waveguiding region from said central longitudinal axis of said fiber structure being in the range of 10-300 μ
- m and said helix having a pitch in the range of 0.1-10 mm.
Specification