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Weak fiber Bragg grating cascade sensor interrogation using microwave photonic filtering techniques

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A microwave photonic technique is presented to interrogate a 5 m-long fiber, containing 9 mm-long weak FBGs having 10 mm grating separation, used as a distributed sensor. Hot-spots as small as 20 cm have been measured with an accuracy of 0.5 cm

© 2014 Optical Society of America

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