Abstract
A temperature-insensitive fiber optic sensor for high-resolution measure
of refractive index is proposed and demonstrated. The sensor is based on
Fresnel reflection modulated by Fabry–Perot interference, which
consists of a section of single-mode fiber (SMF) tip coated with a thin film
of SU-8 at the end of the fiber tip. The fringe contrast of the interference
spectrum reflected from the sensor head is used to determine the extern RI.
The experimental results agree well with the theoretical results and show
that the fringe contrast is not sensitive to temperature variation. Such a
refractive index sensor can offer the refractive index resolution and
accuracy of $5 \times 10^{-6}$ and $5\times 10^{-5}$, respectively. By simultaneous tracking the wavelength shift of
the interference pattern, the sensor also has the potential capability for
the simultaneous measurement of liquid RI and temperature.
© 2010 IEEE
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