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In situ continuous monitoring of carbon hermetic coating thickness

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Abstract

Carbon coatings have been shown to be effective in improving static fatigue resistance and reducing hydrogen-induced losses, which is important because fibers are increasingly used in harsh environments, where exposure to high stress, moisture, and hydrogen affect long-term reliability.1,2 These coatings can be applied at high speeds by drawing the fiber through an atmospheric chemical-vapor-deposition chamber located directly beneath the draw furnace.3 Within the chamber, a hydrocarbon gas is pyrolyzed by a heterogeneous reaction on the fiber surface. The thickness of carbon coating, which is on the order of 100-500 Å, can be controlled by adjusting the concentrations and flow rates of the constitutive gases within the chamber.

© 1991 Optical Society of America

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