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23 May 2023 Cryogenic liquid level sensor based on long period grating
Valeria Hernández-Ambato, David Barrera, Yannick Mathieu, Laurent Sauvanaud, Salvador Sales
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Proceedings Volume 12643, European Workshop on Optical Fibre Sensors (EWOFS 2023); 1264314 (2023) https://doi.org/10.1117/12.2679109
Event: European Workshop on Optical Fibre Sensors (EWOFS 2023), 2023, Mons, Belgium
Abstract
We propose a novel cryogenic liquid level sensor based on a long-period grating inscribed in one of the external cores of a multicore optical fibre. The proposed device has a small grating period to improve the sensitivity to external refractive index changes while reducing the temperature sensitivity. We compare the results obtained with an LPG inscribed in a single-core fibre, demonstrating that the optical spectrum of our device is not divided into two different resonances and shifts smoothly towards shorter wavelengths as the relative liquid level increases. The sensitivity of the proposed level sensor when measuring liquid nitrogen is -0.772 nm/cm.
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Valeria Hernández-Ambato, David Barrera, Yannick Mathieu, Laurent Sauvanaud, and Salvador Sales "Cryogenic liquid level sensor based on long period grating", Proc. SPIE 12643, European Workshop on Optical Fibre Sensors (EWOFS 2023), 1264314 (23 May 2023); https://doi.org/10.1117/12.2679109
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KEYWORDS
Liquids
Cryogenics
Refractive index
Fiber Bragg gratings
Multicore fiber
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