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

1993-06-16

1995-09-12

Gutierrez, Diego F. F.

Thermal measuring and testing

Temperature measurement

Nonelectrical, nonmagnetic, or nonmechanical temperature...

374137, 356 44, 356301, 25022714, G01K 1132

Patent

active

054492335

ABSTRACT:
A temperature distribution measuring apparatus, which inputs pulsed-light into an optical fiber, measures backward Raman-scattered light generated in the optical fiber, and calculates a temperature distribution along the optical fiber in accordance with the ratio of the intensity of anti-Stokes' light to the intensity of Stokes' light of the backward Raman-scattered light. The apparatus comprises an optical filter for extracting the anti-Stokes' light and Stokes' light from the backward Raman-scattered light, an optical attenuator for attenuating the Stokes' light extracted by the optical filter, an optical switch for receiving the anti-Stokes' light extracted by the optical filter and the Stokes' light output from the optical attenuator, and selectively outputting one of the anti-Stokes' flight and Stokes' light, a light-receiving element for detecting the intensity of the light output from the optical switch, an amplifier for amplifying an analog electrical signal produced by the light-receiving element, an amplified analog-to-digital converter for converting the analog electrical signal into a digital signal, and a signal processor for measuring the temperature distribution along the optical fiber by processing the digital signal.

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 et al.
patent: 5217306 (1993-06-01), Wada

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