Journal
OPTICS EXPRESS
Volume 20, Issue 10, Pages 11109-11120Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.20.011109
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Funding
- National Natural Science Foundation of China [60937002, 2009DFA12640]
- International Cooperation Projects between China and Singapore [2009DFA12640]
- Huazhong University of Science and Technology [0124182015]
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We propose and demonstrate a thinned fiber based Mach-Zehnder interferometer for multi-purpose sensing applications. The sensor head is formed by all-fiber in-line singlemode-multimode-thinned-singlemode (SMTS) fiber structure, only using the splicing method. The principle of operation relies on the effect that the thinned fiber cladding modes interference with the core mode by employing a multimode fiber as a mode coupler. Experimental results showed that the liquid refractive index information can be simultaneously provided from measuring the sensitivity of the liquid level. A 9.00 mm long thinned fiber sensor at a wavelength of 1538.7228 nm exhibits a water level sensitivity of -175.8 pm/mm, and refractive index sensitivity as high as -1868.42 (pm/mm)/RIU, respectively. The measuring method is novel, for the first time to our knowledge. In addition, it also demonstrates that by monitoring the wavelength shift, the sensor at a wavelength of 1566.4785 nm exhibits a refractive index sensitivity of -25.2935 nm/RIU, temperature sensitivity of 0.0615 nm/degrees C, and axial strain sensitivity of -2.99 pm/mu epsilon, respectively. Moreover, the sensor fabrication process is very simple and cost effective. (c) 2012 Optical Society of America
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