Fluid flow measurement using optical fibres

Details Fluid flow measurement using optical fibres Fluid flow measurement using optical fibres

2004-03-22

2008-10-07

Williams, Hezron E. (Department: 2856)

Measuring and testing

Volume or rate of flow

Thermal type

C073S152330, C073S204170

Reexamination Certificate

active

07430903

ABSTRACT:
A method of monitoring fluid flow uses an optical fiber having a heatable coating. The fiber is disposed within flowing fluid, and the heatable coating heated so that heat is transferred from the coating to the fluid. Optical measurements of the temperature of the heatable coating are made, where the temperature of the heatable coating depends on the flow velocity of the flowing fluid, and the temperature measurement is used to derive information about the flow. The coating may be an electrically resistive layer on the outer surface of the fiber, that is heated by passing electric current through it. This allows distributed flow measurements to be made. Alternatively, discrete measurements can be made if the coating is provided as a thin film layer on an end facet of the fiber. The coating is heated by directing light at a wavelength absorbed by the thin film material along the fiber.

REFERENCES:
patent: 4986671 (1991-01-01), Sun et al.
patent: 5115127 (1992-05-01), Bobb et al.
patent: 6847034 (2005-01-01), Shah et al.

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