Distributed salinity sensor based on Brillouin dynamic grating

Lei Teng; Yongkang Dong

doi:10.1117/12.2549955

12 March 2020 Distributed salinity sensor based on Brillouin dynamic grating

Lei Teng, Yongkang Dong

Proceedings Volume 11436, 2019 International Conference on Optical Instruments and Technology: Optical Sensors and Applications; 114360Q (2020) https://doi.org/10.1117/12.2549955
Event: 2019 International Conference on Optical Instruments and Technology, 2019, Beijing, China

Abstract

The distributed measurement of salinity is experimentally demonstrated by Brillouin dynamic grating (BDG) The position-resolved salinity change can be measured by mapping the birefringence change through the BDG, where the salinity altering can induce the swelling or shrinking actions of the PI coating through absorbing or releasing water. Four sensors with the coating thickness of 5 μm, 8 μm, 15 μm, and 20 μm were fabricated as demos to characterize the salinity sensitivity of the sensors, with 30.1 MHz/(mol/L) for 5 μm, 75.4 MHz/(mol/L) for 8 μm, 119.2 MHz/(mol/L) for 15 μm, and 139.6 MHz/(mol/L) for 20 μm, respectively. The proposed sensor shows a linear and reproducible response to the salinity change, and its measurement uncertainty is less than 10 MHz, corresponding to the obtained maximum salinity accuracy of 0.072 mol/L.

Citation Download Citation

Lei Teng and Yongkang Dong "Distributed salinity sensor based on Brillouin dynamic grating", Proc. SPIE 11436, 2019 International Conference on Optical Instruments and Technology: Optical Sensors and Applications, 114360Q (12 March 2020); https://doi.org/10.1117/12.2549955

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