Distributed optical fiber sensor with controlled response
AssigneeIntelligent Optical Systems, Inc.
InventorsRobert A. Lieberman, Claudio O. Egalon
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Abstract
Distributed fiber optic chemical and physical sensors provide a relatively highly uniform response over the length of the fiber by, for example, varying such properties as the core/cladding index of refraction ratio to compensate for the non-linearity in sensitivity due to the loss of higher order modes in multi-mode fibers. The variation of the ratio changes the absorption coefficient of the fiber and can be used to compensate for any non-linearity in response. Other techniques for compensation also are disclosed.
Claims10
An optical fiber, said fiber having a core and a cladding, said cladding being permeable and including a composition sensitive to a target chemical, said fiber having at least one parameter that varies as a function of position in said fiber to maintain uniform the level of sensitivity of the reaction between said composition and said target chemical.
Dependencies are inferred from the claim text.