Journal
IEEE SENSORS JOURNAL
Volume 18, Issue 3, Pages 1100-1103Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSEN.2017.2761794
Keywords
Fiber optic sensors; femtosecond laser direct writing; small-period long-period fiber gratings
Funding
- National Key Research and Development Program of China
- National Natural Science Foundation of China [2017YFB1104300, 61590930, 61435005, 51335008, 61605056]
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A small-period long-period grating (LPG) with a period of 40 mu m fabricated in a single-mode fiber by femtosecond laser direct writing has been demonstrated. A series of high-order Bragg resonant peaks of Bragg grating and attenuation bands of LPG can be observed simultaneously in the broadband spectrum range that exhibited different responses to surrounding refractive index, temperature, and axial strain. Meanwhile, we provided a sensitivity matrix to correct the errors caused by temperature in measurements of refractive index and strain to achieve a dual-parameter fiber sensor at high temperature.
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