Abstract
A fiber in-line Fabry–Pérot interferometer is presented. The sensing head
consists of a micro ellipsoidal air cavity and a small section of solid-core photonic
crystal fiber. The reflective index (RI) and temperature can be interrogated
simultaneously through a fast Fourier transform and by tracing the dip wavelength shift
of the reflective spectrum. Experimental results show that the RI amplitude and
wavelength sensitivities are 5.30/RIU and 8.46×10−1 nm/RIU in the range from
1.34 to 1.43, and the temperature amplitude and wavelength sensitivities are
6.8×10−4/°C and 2.48×10−3 nm/°C in the range from 15°C to
75°C, respectively. Easy fabrication, a simple system, and simultaneous measurement make
it appropriate for dual-parameter sensing application.
© 2016 Chinese Laser Press
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