Distributed temperature sensor using optical reflectometry

Details Distributed temperature sensor using optical reflectometry Distributed temperature sensor using optical reflectometry

2008-04-01

2008-04-01

Verbitsky, Gail (Department: 2859)

Thermal measuring and testing

Temperature measurement

Nonelectrical, nonmagnetic, or nonmechanical temperature...

C374S130000, C356S073100, C356S337000, C356S342000

Reexamination Certificate

active

07350972

ABSTRACT:
A temperature sensing method in which pulses of optical radiation are launched by a laser diode (11) into an optical fibre (14) and optical radiation backscattered from the fibre is detected, the method comprising passing the backscattered radiation through a single optical filter (15) whereby a first signal is recorded at the anti-Stokes Raman wavelength from a signal launched by the laser diode in a laser mode and a second signal is recorded at the Rayleigh wavelength from a signal launched by the laser diode in a light emitting diode mode, and a comparison is made of the two signals to provide an indication of temperature.

REFERENCES:
patent: 4823166 (1989-04-01), Hartog et al.
patent: 5113277 (1992-05-01), Ozawa et al.
patent: 5217306 (1993-06-01), Wada
patent: 5592282 (1997-01-01), Hartog
patent: 5638172 (1997-06-01), Alsmeyer et al.
patent: 5765948 (1998-06-01), Sai
patent: 5820265 (1998-10-01), Kleinerman
patent: 2003/0021528 (2003-01-01), Fredin et al.

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