Distributed optical fibre measurements

Details Distributed optical fibre measurements Distributed optical fibre measurements

2007-10-23

2007-10-23

Gutierrez, Diego (Department: 2859)

Thermal measuring and testing

Temperature measurement

In spaced noncontact relationship to specimen

C356S073100, C356S337000, C356S342000

Reexamination Certificate

active

10554116

ABSTRACT:
A method of obtaining a distributed measurement comprises deploying an optical fibre in a measurement region of interest, and launching into it a first optical signal at a first wavelength λ0and a high power level, a second optical signal at a second wavelength λ−1, and a third optical signal at the first wavelength λ0and a low power level. These optical signals generate backscattered light at the second wavelength λ−1arising from Raman scattering of the first optical signal which is indicative of a parameter to be measured, at the first wavelength λ0arising from Rayleigh scattering of the first optical signal, at the second wavelength λ—1arising from Rayleigh scattering of the second optical signal, and at the first wavelength λ0arising from Rayleigh scattering of the third optical signal. The backscattered light is detected to generate four output signals, and a final output signal is derived by normalising the Raman scattering signal to a function derived from the three Rayleigh scattering signals, which removes the effects of wavelength-dependent and nonlinear loss.

REFERENCES:
patent: 5217306 (1993-06-01), Wada
patent: 5449233 (1995-09-01), Sai et al.
patent: 5765948 (1998-06-01), Sai
patent: 2003/0021528 (2003-01-01), Fredin et al.
patent: 2006/0210269 (2006-09-01), Farhadiroushan et al.

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