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A novel approach based on multiple fiber Bragg gratings for measuring the distributed strain, which is temperature compensated, is demonstrated. Especially, in order to increase the measurement accuracy, a metrological grating is employed to read out the output of the system. The measurement resolution of the system is less than 0.5με.
The authors demonstrated a novel system to interrogate the Bragg wavelengths shift of an array of in-fiber Bragg gratings. The system used another array of in-fiber Bragg gratings as tracking filters to track the shifting reflected wavelengths of in-fiber Bragg gratings and locate the peaks of wavelengths by a digitizing method. A grating scale was employed to read out the output of the system. The...
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