Fiber optic hot-wire flowmeter based on a metallic coated hybrid long period grating/fiber Bragg grating structure
Applied Optics, 2011•opg.optica.org
In this work an all-optical hot-wire flowmeter based on a silver coated fiber combining a long
period grating and a fiber Bragg grating (FBG) structure is proposed. Light from a pump laser
at 1480? nm propagating down the fiber is coupled by the long period grating into the fiber
cladding and is absorbed by the silver coating deposited on the fiber surface over the Bragg
grating structure. This absorption acts like a hot wire raising the fiber temperature locally,
which is effectively detected by the FBG resonance shift. The temperature increase depends …
period grating and a fiber Bragg grating (FBG) structure is proposed. Light from a pump laser
at 1480? nm propagating down the fiber is coupled by the long period grating into the fiber
cladding and is absorbed by the silver coating deposited on the fiber surface over the Bragg
grating structure. This absorption acts like a hot wire raising the fiber temperature locally,
which is effectively detected by the FBG resonance shift. The temperature increase depends …
In this work an all-optical hot-wire flowmeter based on a silver coated fiber combining a long period grating and a fiber Bragg grating (FBG) structure is proposed. Light from a pump laser at 1480?nm propagating down the fiber is coupled by the long period grating into the fiber cladding and is absorbed by the silver coating deposited on the fiber surface over the Bragg grating structure. This absorption acts like a hot wire raising the fiber temperature locally, which is effectively detected by the FBG resonance shift. The temperature increase depends on the flow speed of the surrounding air, which has the effect of cooling the fiber. It is demonstrated that the Bragg wavelength shift can be related to the flow speed. A flow speed resolution of 0.08?m/s is achieved using this new configuration.
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