de Oliveira Lelis A, de Sousa Fabio B, de Sousa Fiterlinge M, Tavares Simone C C, Paschoal Waldomiro, Costa Marcos B C
Instituto Federal de Educação, Ciência e Tecnologia do Pará, Avenida Rio de Janeiro, 3322, Abaetetuba, Pará 68.440 000 Brazil.
Programa de Pós-Graduação em Engenharia Elétrica, Universidade Federal do Pará, Rua Augusto Corrêa, 01, Belém, Pará 66.075-110 Brazil.
Opt Quantum Electron. 2022;54(11):731. doi: 10.1007/s11082-022-04031-w. Epub 2022 Sep 16.
This work proposes an optical fiber sensor capable of simultaneously determining the variation in the level and temperature of the waters of rivers in the Amazon using two in Fibers Bragg Grating (FBG) coupled to a metallic bellows structure, which was experimentally demonstrated in terms of the characterization of FBGs, where one of them is a temperature compensator. The system was simulated according to the Coupled Modes Theory (CMT) and the Transfer Matrix Method (TMM) and experimentally the sensitivity of the sensors was analyzed from the wavelength displacement measurements, simultaneously varying the deformation and temperature. The experimental results show a sensitivity of 9.2 pm/cm and water level measurements up to the limit of 3.95 m with a wavelength variation of 3.69 nm for the strain sensor. The proposed sensor is simple and has enormous potential to be used to monitor the level of rivers in the Amazon in areas at risk of flooding.
这项工作提出了一种光纤传感器，该传感器能够使用两个耦合到金属波纹管结构的光纤布拉格光栅（FBG）同时测定亚马逊河河水水位和温度的变化，这在FBG的特性表征方面得到了实验验证，其中一个FBG是温度补偿器。该系统根据耦合模理论（CMT）和传输矩阵法（TMM）进行了模拟，并通过波长位移测量对传感器的灵敏度进行了实验分析，同时改变应变和温度。实验结果表明，应变传感器的灵敏度为9.2 pm/cm，水位测量上限为3.95 m，波长变化为3.69 nm。所提出的传感器结构简单，在亚马逊河洪水风险地区监测河流水位方面具有巨大的应用潜力。
