Abstract
A simple intrinsic Fabry–Perot interferometric (IFPI) sensor is developed. The sensor is
fabricated by two micro air gaps as reflective mirrors in a fiber to form a Fabry–Perot cavity. Theoretical
and experimental studies of the sensor are described. Experimental results show that high resolution and
high sensitivity can be achieved. Two structures of micro-air-gap-based IFPI sensors offer more
applications than other IFPI sensors.
© 2006 Optical Society of America
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