Thermal measuring and testing – Temperature measurement – In spaced noncontact relationship to specimen
Patent
1990-06-07
1991-10-08
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
050549359
ABSTRACT:
A temperature-measuring method which comprises inputting laser pulses into an optical fiber to be measured and measuring the temperature distribution in the fiber from the ratio of the amplitudes and the delay time of the Stokes light and the anti-Stokes light contained in the return beam from the optical fiber, wherein the temperature distribution is measured by using an equation: ##EQU1## where T(x) is the temperature to be measured, .THETA. is the reference temperature, R'(T) is the relative ratio of amplitude to the measuring point, R'(.THETA.) is the relative ratio of amplitude at the reference temperature point, k is the Boltzmann's constant, h is the Planck's constant, c is the velocity of light, .nu. is the Raman shift, .alpha. is the attenuation difference in the optical fiber between the Stokes light and the anti-Stokes light, and x is the distance, wherein the attenuation differenct .alpha. is represented by a function .alpha.{T(.tau.)} which is dependent on the 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 III, (1985), pp. 249-256.
Ikawa Koji
Tanabe Yuzuru
Asahi Glass Company Ltd.
Cuchlinski Jr. William A.
Gutierrez Diego F. F.
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