Journal
OPTICS AND LASER TECHNOLOGY
Volume 126, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.optlastec.2020.106121
Keywords
Fiber sensor; Long period fiber grating; Refractive index modulation; Simultaneous measurement
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Funding
- National Natural Science Foundation of China (NSFC) [U1831115, U1631239]
- Chinese Academy of Sciences (CAS) [U1831115, U1631239]
- National Natural Science Foundation of China [11704086]
- Fundamental Research Funds for the Central Universities
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A SMF-MMF-SMF-ultra long period fiber grating (SMS-ULPFG) sensor is proposed for the simultaneous measurement of axial strain and temperature. The all-optical fiber sensor was fabricated by periodically splicing a multimode fiber (MMF) and a single mode fiber (SMF). Due to the strong refractive index (RI) modulation ability of the MMF, the sensor forms two resonant dips with smaller dimensions (the period of 1000 mu m and total length of 5 mm). The transmission spectra were obtained by experiments and simulations. The results of the performance tests indicate that the uncertainty values of the SMS-ULPFG structure are 3.26 mu epsilon and 0.23 degrees C over the ranges of 0-1000 mu epsilon and 26-118 degrees C.
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