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

Amelia Lavinia Ricchiuti; David Barrera; Koji Nonaka; Salvador Sales

doi:10.1117/12.2026686

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20 May 2013 Fiber optic liquid-level sensor using a long fiber Bragg grating

Amelia Lavinia Ricchiuti, David Barrera, Koji Nonaka, Salvador Sales

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Proceedings Volume 8794, Fifth European Workshop on Optical Fibre Sensors; 87941J (2013) https://doi.org/10.1117/12.2026686
Event: Fifth European Workshop on Optical Fibre Sensors, 2013, Krakow, Poland

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.

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Amelia Lavinia Ricchiuti, David Barrera, Koji Nonaka, and Salvador Sales "Fiber optic liquid-level sensor using a long fiber Bragg grating", Proc. SPIE 8794, Fifth European Workshop on Optical Fibre Sensors, 87941J (20 May 2013); https://doi.org/10.1117/12.2026686

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