Optics: measuring and testing – For light transmission or absorption – Of fluent material
Patent
1988-11-29
1990-07-24
Evans, F. L.
Optics: measuring and testing
For light transmission or absorption
Of fluent material
356432, 250301, 436 29, G01N 2100
Patent
active
049431617
ABSTRACT:
A method and apparatus for the detection of hydrocarbons dissolved in bodies of water and for the determination of their concentration in the water wherein a water sample is introduced into a sealed system in which the hydrocarbons are driven out of solution into a gas phase by heating the sample or exposing it to low pressure, or both, a laser beam of a wavelength or a frequency which provides for at least partial overlapping with the absorption lines of the hydrocarbons is directed through the gaseous phase, a correction laser beam of a wavelength such that it is not subjected to absorption by hydrocarbons is also directed through the gaseous phase to determine the influence of gases other than hydrocarbons and the amount of hydrocarbons in the water iscalculated from the amount of light energy absorbed in the gas phase by any hydrocarbons therein and a correction as determined by the correction laser beam.
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Michaelis Walfried
Weitkamp Claus
Evans F. L.
GKSS - Forschungszentrum Geesthacht GmbH
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