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Sensing with Fiber Bragg Gratings in Rapidly Rotating Structures

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Long-used in the telecommunications industry, fiber Bragg gratings are now used to measure the strain and temperature of buildings, roads and bridges. A new technique involving collimators and a series of the fiber Bragg gratings can monitor strain in rapidly moving components like helicopter blades and turbines.

EHUD SHAFIR, SHLOMI ZILBERMAN AND GARRY BERKOVIC, SOREQ NUCLEAR RESEARCH CENTER

Although the main use for fiber Bragg gratings (FBG)1 has been in telecommunications (for multiplexing and demultiplexing different wavelength channels and dispersion compensation), FBGs are increasingly used to measure strain and temperature in mechanical structures such as buildings, roads and bridges2. A good example3 is the Tsing Ma Bridge in Hong Kong in which numerous FBGs were implanted over a decade ago to monitor strain under traffic and extreme weather conditions such as typhoons. Fiber optic sensors incorporated into these structures are subject to relatively small and slow...Read full article

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