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Proceedings Paper

Fiber optic liquid-level sensor using a long fiber Bragg grating
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Paper Abstract

A technique for liquid-level sensors based on a long fiber Bragg grating (FBG) is presented and experimentally demonstrated. The measurement system is based on the measurement of the central frequency distribution of the FBG based on time-frequency domain analysis. A short optical pulse is injected into a 10-cm long FBG mounted in a container. The back-reflected pulse is scanned by means of an oscilloscope. When part of the grating is immersed in a liquid having temperature higher than the surrounding ambient, the structure of the uniform grating is distorted and its time-frequency response changes. A spatial resolution of 2 mm, given by the input pulse duration, and a 10-cm long measurement range are achieved. Liquid-temperature sensing has also been implemented by scanning the spectral response of the FBG by means of a CW laser and an OSA.

Paper Details

Date Published: 20 May 2013
PDF: 4 pages
Proc. SPIE 8794, Fifth European Workshop on Optical Fibre Sensors, 87941J (20 May 2013); doi: 10.1117/12.2026686
Show Author Affiliations
Amelia Lavinia Ricchiuti, Univ. Politècnica de València (Spain)
David Barrera, Univ. Politècnica de València (Spain)
Koji Nonaka, Kochi Univ. of Technology (Japan)
Salvador Sales, Univ. Politècnica de València (Spain)


Published in SPIE Proceedings Vol. 8794:
Fifth European Workshop on Optical Fibre Sensors
Leszek R. Jaroszewicz, Editor(s)

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