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Measurement of pressure in oceanography using fiber Bragg gratings

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Abstract

Pressure and temperature are fundamental properties of the oceanic water. They have varying effects on the processes that take place in oceans: be they biological, physical or chemical. Pressure always increases with respect to surface, when one goes down; temperature has a more complex variation with respect to the depth. Various tools and techniques are available to measure these properties.

This paper presents the pressure sensing using Fiber Bragg Grating (FBG) sensors for oceanography based on the proposed two novel sensor heads, the first sensor head comprises an FBG fixed between silicon rubber foil and sensor head wall while in the second, the FBG is fixed between two silicone rubber foils. The pressure on walls of silicon rubber foils elongates FBG, which results in shift of Bragg wavelength. Theoretical studies carried out on these proposed sensor heads resulted in pressure sensitivity of about eight times greater than that of bare FBG. Further, the proposed sensors have shown good linearity and stability.

© 2013 Optical Society of America

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