Temperature distribution measuring apparatus using an optical fi

Details Temperature distribution measuring apparatus using an optical fi Temperature distribution measuring apparatus using an optical fi

1995-05-04

1997-04-08

Gutierrez, Diego F. F.

Thermal measuring and testing

Temperature measurement

Nonelectrical, nonmagnetic, or nonmechanical temperature...

374137, 356 44, 356301, 25022714, G01K 1132

Patent

active

056181086

ABSTRACT:
An apparatus for measuring a temperature distribution along an optical fiber, comprises a light source for inputting pulsed-light into the optical fiber, an optical filter for receiving backward Raman-scattered light from the optical fiber and extracting anti-Stokes' light and Stokes' light, an optical attenuator for attenuating the intensity of the Stokes' light extracted by the optical filter, first and second signal paths each of which includes a light-receiving element and an analog-to-digital converter, a signal processor for calculating a temperature distribution along the optical fiber on the basis of the first and second signal paths, and an optical switch having a first input port for receiving the anti-Stokes' light, a second input port for receiving the Stokes' light, a first output port, and a second output port, the optical switch transmitting the anti-Stokes' light and the Stokes' light to the first output port and the second output port in a first switching position and transmitting the Stokes' light and the anti-Stokes' light to the first output port and the second output port in a second switching position.

REFERENCES:
patent: 4767219 (1988-08-01), Bibby
patent: 4823166 (1989-04-01), Hartog et al.
patent: 5028146 (1991-07-01), Wada
patent: 5054935 (1991-10-01), Tanabe etal.
patent: 5217306 (1993-06-01), Wada

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