We propose a method that allows one to carry out a remote estimation of small concentrations of gases dissolved in water at large depths. The method is based on modulation laser spectroscopy combined with the application of a fiber-optical communication line. We demonstrate specific features and advantages of the method of modulation laser spectroscopy for the spectral analysis in aqueous media with large attenuation. We develop the structural scheme of a measuring system, whose main components are a one-mode fiber-optical communication line, a laser diode with tuning frequency, and a gauge in the form of a hollow ellipsoidal mirror reflector. The principle of self-focusing of radiation in the gauge is considered. The expedience of the use of modulation laser spectroscopy and a measuring system in the solution of problems of the analysis of aqueous media is evaluated.
Physical Oceanography – Springer Journals
Published: Dec 15, 2010
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