Temperature distribution analyzer using optical fiber

Details Temperature distribution analyzer using optical fiber Temperature distribution analyzer using optical fiber

1991-12-19

1993-06-08

Cuchlinski, Jr., William A.

Thermal measuring and testing

Temperature measurement

Nonelectrical, nonmagnetic, or nonmechanical temperature...

374131, 356 44, 356301, G01J 500

Patent

active

052173062

ABSTRACT:
A temperature distribution analyzer is disclosed. In the analyzer, a measuring optical fiber is provided so as to extend through a target region in order to analyze the temperature distribution of the region. A LD pumped solid state laser generates pulse light having high energy and supplies the pulse light to one of the terminal portions of an optical fiber. This causes a stimulated-Raman-scattering phenomenon in the optical fiber whereby Raman-scattered light is obtained from the other terminal portion of the excitation optical fiber. An optical filter selects light having a predetermined wavelength from the Raman-scattered light and outputs the selected light. An optical device introduces the output light of the optical filter to one of the terminal portions of the measuring optical fiber and receives Raman-backscattered light generated in the measuring optical fiber through the same terminal portion. A photodetector converts the Raman-backscattered light to an electrical signal. A computing device determines temperatures of portions of the measuring optical fiber based on the variation over time of the electrical signal.

REFERENCES:
patent: 4673299 (1987-06-01), Dakin
patent: 4767219 (1988-08-01), Bibby
patent: 4823166 (1989-04-01), Hortog et al.
patent: 4958910 (1990-09-01), Taylor et al.
patent: 5054935 (1991-10-01), Tanabe et al.
patent: 5102232 (1992-04-01), Tanabe et al.
European Search Report dated Jun. 1, 1992.
J. P. Dakin and D. J. Pratt; Temperature Distribution Measurement Using Raman Ratio Thermometry, vol. 566, Aug. 20, 1985, San Diego, pp. 249-256.

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