ABSTRACT
When fiber optics was being developed for communications, efforts were underway to use the new technology for sensing at the same time. Optical fiber sensors are being broadly advanced as they have numerous advantages over conventional sensors such as the ability to function in harsh environments, small sizes, with electromagnetic interference, and many more. Among them, interferometer-based fiber-optic sensors have been implemented for a wide range of applications since 1980. After the introduction of fiber-optic Fabry–Perot interferometer (FFPI), optical sensors based on FFPI has been extensively studied due to their high performance and ability for signal "amplification". FFPIs have shown considerable potential for sensing in various fields, such as energy, aerospace, biomedicine. Engineering applications of FFPI sensors have been demonstrated by Gahan and Donlagic and their coworkers, respectively. Structural health monitoring needs technologies of real-time monitoring and non-destructive detection, which are difficult to achieve using conventional methods.
