Toward Active Distributed Fiber-Optic Sensing: A Review of Distributed Fiber-Optic Photoacoustic Non-Destructive Testing Technology.

In summary, recent advancements in high-sensitivity fiber-optic ultrasonic sensors demonstrate a clear trend toward novel materials (e.g., MoS 2 , chitosan), MEMS and nanofabrication techniques (e.g., TPP), and innovative resonant structures (e.g., FZPs, dual-cavities).

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These developments, featuring innovative structures such as tapered fibers, microspheres, and waveguides, demonstrate a strong trend towards achieving multifunctional, robust, and array-compatible fiber-optic ultrasonic sensors, effectively expanding their applicability in diverse inspection environments. 2.2.

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