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We demonstrate the fabrication of the long-period fiber gratings (LPFGs) in the thinned cladding fiber by CO2 laser and the characteristics of the gratings is experimentally investigated for the sensor application. The cladding modes are excited in the thinned cladding fiber, which is found to be highly sensitive to the surrounding index changes. A high index sensitivity of 7366.6 nm/refractive index...
We present a tilted fiber Bragg grating (TFBG)-based fiber optic sensor for the simultaneous measurement of liquid level and temperature. Due to different responses of cladding modes and core mode in TFBG spectrum to liquid level and temperature changes, both values can be measured independently. The examined 3.5° TFBG exhibits linear liquid level, as well as temperature, responses and sensitivities...
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