Fiber-optic Extrinsic Fabry-Perot (EFPI) sensors have been successfully used for a wide range of applications, in particular, structural health monitoring (SHM). The recent progress in EFPI sensors is reviewed in this paper. Firstly, the optical amplification technology is adopted into the EFPI sensor system to enhance the interferometric signal. Secondly, both spatial-frequency- and coarse-wavelength-division multiplexing technologies are proposed and demonstrated for enhancing the multiplexing capacity of modified EFPI sensors, called Fizeau sensors, considerably. Thirdly, the uses of the EFPI sensors in SHM of composite materials and bridges are described.

© 2006 IEICE

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