Abstract
A novel miniature fiber-optic Fabry–Perot (F-P) refractive-index
(RI) sensor machined by 157 nm laser is proposed. The sensor head consists
of a micro air F-P cavity near the tip of a single-mode fiber with a micro
channel on the fiber tip used as both inlet and outlet for medium under
test. Thin films are coated at reflective interfaces of the F-P cavity as
mirrors to ensure high optical contrast, respectively. A RI resolution of
1130.887 nm/RI unit (RIU) is achieved by experiment. Such a sensor has a
number of outstanding advantages when compared with other fiber-optic RI
sensors, such as very small, rigid, high resolution, excellent linearity,
wide measurement range,
© 2009 IEEE
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