Abstract
In this paper, we report a novel in-line fiber Fabry–Perot (F-P)
etalon, consisting of a section of hollow-core photonic bandgap fiber (HC-PBGF)
spliced between two single mode fibers. The fabrication process of such a
sensor is simple and straightforward, including only cleaving and splicing.
The sensing characteristics of the F-P etalon based on HC-PBGF, including
high temperature, strain, bend, and transverse load, are fully investigated
by experiments, for the first time to our knowledge. It is found that such
a F-P etalon can be used under high temperatures of up to 600$ \,\,^{\circ}{\hbox {C}}$, and has a
low cavity-length-to-temperature sensitivity of $\sim {1.4}~{\hbox {nm}}/^{\circ}{\hbox {C}}$,
while it has a relatively high strain sensitivity of $\sim {5.9}~{\hbox {nm}}/\mu \varepsilon$.
Moreover, this F-P etalon is insensitive to bend or transverse load. Furthermore,
the long cavity length ($>
{1}~{\hbox {cm}}$) of the sensor makes it suitable for multiplexing.
These characteristics would make this HC-PBGF-based F-P etalon to be an excellent
strain sensor or gas sensor for use in high-temperature environments.
© 2009 IEEE
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