Unmatched Multiplexing Capabilities with FP/FBG sensors
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(Image credit: The Hong Kong Polytechnic University)
A schematic (a) shows the accelerometer based on a Sagnac interferometer that uses a polarization-maintaining photonic crystal fiber (PM-PCF) sandwiched between a flat substrate and stainless-steel mass. The measured interference spectrum (b) for the 0.35 m link of fiber translates vibration force to parameters that indicate structural health of an affected structure with high sensitivity over a broad frequency range.