Journal
OPTICS COMMUNICATIONS
Volume 377, Issue -, Pages 89-93Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.optcom.2016.05.039
Keywords
Long period fiber grating; Optical fiber sensors; Temperature measurement; Sensitivity-enhanced
Categories
Funding
- National Natural Science Foundation of China [61203206]
- Fundamental Research Funds for the Central Universities [N140405001]
- Specialized Research Fund for the Doctoral Program of Higher Education of China [20120042120038]
- National Science Foundation for Distinguished Young Scholars of China [61425003]
- State Key Laboratory of Synthetical Automation for Process Industries [2013ZCX09]
- Natural Science Foundation of Hebei Province [F2014501137]
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A sensitivity-enhanced temperature sensor based on a poly-dimethylsiloxane (PDMS)-coated long period fiber grating (LPFG) has been proposed and experimentally investigated. By embedding the LPFG in a temperature-sensitive elastomeric polymer, the temperature sensitivity of the proposed sensor could be effectively improved by 4 times higher than those of the conventional bare LPFG sensors due to the high thermo-optic coefficient (TOC) of PDMS. It can be found that the temperature sensitivities of higher order modes are higher than those of lower-order modes by analyzing transmission spectra characteristics of the sensor. Because of LPFG is sensitive to surrounding refractive index (RI), the PDMS-coated LPFG will have a high temperature sensitivities of 255.4 pm/C in the range of 20-80 degrees C. Due to the high measurement resolution of 0.078 degrees C, the sensor is promising to be applied to the fields that high-precision temperature measurement is required. (C) 2016 Elsevier B.V. All rights reserved.
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