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Marques, C. A. F.; Pospori, A.; Saez-Rodriguez, D.; Nielsen, Kristian; Bang, Ole; Webb, D. J. (2015)
Publisher: SPIE - International Society for Optical Engineering
Languages: English
Types: Part of book or chapter of book
Subjects: CORE, High sensitivity, Polymer optical fiber sensors, Fiber Bragg gratings, ENGINEERING,, OPTICS, OPTICAL-FIBER, Liquid level monitoring systems, PHYSICS,
A highly sensitive liquid level monitoring system based on microstructured polymer optical fiber Bragg grating (mPOFBG) array sensors is reported for the first time. The configuration is based on five mPOFBGs inscribed in the same fiber in the 850 nm spectral region, showing the potential to interrogate liquid level by measuring the strain induced in each mPOFBG embedded in a silicone rubber (SR) diaphragm, which deforms due to hydrostatic pressure variations. The sensor exhibits a highly linear response over the sensing range, a good repeatability, and a high resolution. The sensitivity of the sensor is found to be 98 pm/cm of water, enhanced by more than a factor of 9 when compared to an equivalent sensor based on a silica fiber around 1550 nm. The temperature sensitivity is studied and a multi-sensor arrangement proposed, which has the potential to provide level readings independent of temperature and the liquid density.

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