Abstract
A simple fiber tip sensor for refractive index (RI) measurement based on
Fabry-Perot (FP) interference modulated by Fresnel reflection is proposed and
demonstrated. The sensor head consists of an etching-induced micro air gap near the
tip of a single-mode fiber. The microgap and the fiber tip function as two
reflectors to form a FP cavity. The external RI can be unambiguously measured by
monitoring the fringe contrast of the interference pattern from the reflection
spectrum. The experimental results show that the proposed sensor achieves
temperature-independent RI measurement with good linear response. The proposed
sensor achieves a high RI resolution of up to 3.4 \times 10?5 and has advantages of
low cost and easy fabrication.
© 2012 Chinese Optics Letters
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