Modeling of Hydrogel Coated Fiber Bragg Grating pH Sensor
Keywords:
Optical pH sensor, fiber bragg grating, hydrogel, strain.Abstract
This paper present the modeling and simulation of
the hydrogel coated FBG for pH sensor application. The
hydrogel swelling was modeled by using Poisson-Nernst-Planck
equation and mechanical equilibrium equation. The simulation
was done by assuming that the hydrogel was coated on unetched
fiber and etched fiber. The strain induced at the fiber core was
analyzed using finite element method. It was found that at the
region near the jacketed fiber, the strain is distributed
nonuniformly. The non uniform area for etched fiber is shorter
than that of unetched fiber. The Bragg wavelength shift due to
strain of the etched fiber is much larger than that of the
unetched fiber.
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