Method and apparatus for remotely measuring the distribution of

Details Method and apparatus for remotely measuring the distribution of Method and apparatus for remotely measuring the distribution of

1987-01-30

1988-08-09

Howell, Janice A.

Radiant energy

Luminophor irradiation

250227, 2504591, G01N 2164

Patent

active

047630094

ABSTRACT:
The invention relates to a method and to apparatus for remotely measuring the distribution of a physico-chemical parameter in a medium. The method consists in exciting measurement points (20) situated in a medium (17) in succession via an optical fiber (18), with each point (20) being excited by two light pulses of different wavelengths offset from each other in time occurring simultaneously at said point, each measurement point returning radiation at a third wavelength representative of the temperature of the measurement point. The apparatus includes two lasers (3, 4) emitting different wavelengths, a delay circuit (5) for delaying the light pulse from one (4) of the two lasers, and the measurement points include a material sensitive to biphotonic excitation.

REFERENCES:
patent: 4409476 (1983-10-01), Lofgren et al.
patent: 4433238 (1984-02-01), Adolfsson et al.
patent: 4626693 (1986-12-01), Hirschfeld
patent: 4644154 (1987-02-01), Brog.ang.rdh et al.
patent: 4673299 (1987-06-01), Dakin
R. L. McKenzie and K. P. Gross, "Two-Photon Excitation of Nitric Oxide Fluorescence as a Temperature Indicator in Unsteady Gasdynamic Processes", Applied Optics, vol. 20, No. 12, (Jun. 15, 1981), pp. 2153-2165.
S. A. Kingsley, "Distributed Fiber-Optic Sensors", Advances in Instrumentation, vol. 39, (Oct. 22-25, 1984), pp. 315-380, Research Triangle Park, NC.
"Remote Measurement of Temperature Distribution Using an Optical Fiber", A. G. Hartog et al., Conference Europeenee Sur Les Communications Optiques, (Sep. 19, 1982), pp. 215-220.

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