Polarization based fiber optic downhole flowmeter

Details Polarization based fiber optic downhole flowmeter Polarization based fiber optic downhole flowmeter

2011-02-22

2011-02-22

Nguyen, Sang (Department: 2886)

Optics: measuring and testing

By polarized light examination

Of surface reflection

C356S477000, C073S861040, C073S861170, C385S012000, C250S227180

Reexamination Certificate

active

07894061

ABSTRACT:
A flow monitoring system includes a pipe for transporting a fluid therethrough. An optical fiber generally spirals about the pipe along a longitudinal portion having a predetermined length to serve as a single transducer for detecting flow information from the longitudinal portion. A linear polarizer/analyzer circuit communicates with the optical fiber. A light source communicates with the linear polarizer/analyzer circuit and generates a light signal along the optical fiber at a frequency greater than a period of a disturbance to flow past the predetermined length of the transducer. A reflector is disposed along the optical fiber for reflecting the light signal along the optical fiber. An optical detector communicates with the linear polarizer/analyzer circuit. The optical detector determines from the light signal dynamic events along the optical fiber indicative of flow disturbances passing by the transducer.

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