Highly sensitive liquid level monitoring system utilizing polymer fiber Bragg gratings

Carlos A.F. Marques, Gang-Ding Peng, David J. Webb

Research output: Contribution to journalArticlepeer-review


A novel and highly sensitive liquid level sensor based on a polymer optical fiber Bragg grating (POFBG) is experimentally demonstrated. Two different configurations are studied and both configurations show the potential to interrogate liquid level by measuring the strain induced in a POFBG embedded in a silicone rubber diaphragm, which deforms due to hydrostatic pressure variations. The sensor exhibits a highly linear response over the sensing range and a good repeatability. For comparison, a similar sensor using a FBG inscribed in silica fiber is fabricated, which displays a sensitivity that is a factor of 5 smaller than the POFBG. The temperature sensitivity is studied and a novel multi-sensor arrangement proposed which has the potential to provide level readings independent of temperature and the liquid density.
Original languageEnglish
Pages (from-to)6058–6072
Number of pages15
JournalOptics Express
Issue number5
Early online date26 Feb 2015
Publication statusPublished - 9 Mar 2015

Bibliographical note

Funding: Marie Curie Intra European Fellowship included in the 7th
Framework Program of the European Union (POSSIBLE PIEF-GA-2013-628604 project).


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