Optical waveguides – Optical waveguide sensor
Reexamination Certificate
2006-12-29
2008-12-02
Sanghavi, Hemang (Department: 2874)
Optical waveguides
Optical waveguide sensor
C356S483000, C324S096000
Reexamination Certificate
active
07460741
ABSTRACT:
An apparatus for sensing current and a method for sensing current are provided. The apparatus includes an optical fiber having first and second opposing ends and a hollow passageway therethrough, a recirculator configured such that when light propagates from the respective first and second ends of the optical fiber, at least some of the light is reflected by the recirculator into the respective opposing ends of the optical fiber to propagate through the optical fiber and form an optical loop having an opening therethrough, and a Faraday sensitive material positioned in the optical loop such that the light passes therethrough, an index of refraction of the Faraday sensitive material changes when a current flows through the opening of the optical loop.
REFERENCES:
patent: 5214377 (1993-05-01), Maurice et al.
patent: 2006/0126990 (2006-06-01), Deng et al.
Kurosawa K. et al., “Flexible Fiber Faraday Effect Current Sensor Using Flint Glass Fiber and Reflection Scheme”, Ieice Transactions on Electronics, Electronics Society, Tokyo, JP, vol. E83-C, No. 3, Mar. 3, 2000, pp. 326-329.
Sanders Glen A.
Sanders Steve J.
Black Lowe & Graham PLLC
Honeywell International , Inc.
Prince Kajli
Sanghavi Hemang
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