Temperature-measuring method and distributed optical fiber tempe

Details Temperature-measuring method and distributed optical fiber tempe Temperature-measuring method and distributed optical fiber tempe

1991-06-26

1992-04-07

Cuchlinski, Jr., William A.

Thermal measuring and testing

Temperature measurement

In spaced noncontact relationship to specimen

374161, 374129, 356 44, 356301, 25022714, G01K 1100, G01J 508, G01J 510

Patent

active

051022320

ABSTRACT:
A temperature-measuring method comprises inputing laser pulses into an optical fiber to be measured and measuring temperature distribution in the fiber from the ratio of the amplitudes and the delay time of Stokes light and anti-Stokes light contained in the return beam from the optical fiber, wherein the temperature distribution is measured by using equations: ##EQU1## where T(x) is temperature to be measured, .THETA. is the reference temperature, R' (T) is the relative ratio of amplitude at the measuring point, R' (.THETA.) is the relative ratio of amplitude at the reference temperature point, k is Boltzmann's constant, h is Planck's constant, c is velocity of light, .nu. is Raman shift, .alpha. is distance, wherein the attenuation difference .alpha. is represented by a function .alpha.{T(.tau.)} dependent on temperature T(.tau.) at the measuring point .tau., and the exponential function in which the exponential part is represented by a value obtained by integrating the function .alpha.{T(.tau.)} with the variation d.tau. in distance, is employed as a correction factor.

REFERENCES:
patent: 4367040 (1983-01-01), Goto
patent: 4508461 (1985-04-01), Lambert
patent: 4673299 (1987-06-01), Dakin
patent: 4714829 (1987-12-01), Hartog et al.
patent: 4767219 (1988-08-01), Bibby
patent: 4804264 (1989-02-01), Kirchhofer et al.
patent: 4823166 (1989-04-01), Hartog et al.
"Temperature Distribution Measurement Using Raman Ratio Thermometry", SPIE vol. 566 Fiber Optic & Laser Sensors III (1985), pp. 249-255.

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