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The paper presents an effective and efficient method for sensor fault detection and identification within a large group of sensors based upon hierarchical cluster analysis. Fingerprints of the hierarchical clustering dendrograms are found for normal operation using normalized data, and sensor faults are detected through cluster changes occurring in the dendrogram. The proposed strategy is built into...
We report a novel refractive index sensor using mechanical pressure induced long period gratings in photonic crystal fiber. Sensitivity of ~10-6 was achieved for the measurand in the holey channels..
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