Opt Express. 2020 Jun 22;28(13):19740-19749. doi: 10.1364/OE.397505.
Environmental monitoring and potable water control are key applications where optical fiber sensing solutions can outperform other technologies. In this work, we report a highly sensitive plasmonic fiber-optic probe that has been developed to determine the concentration of cadmium ions (Cd) in solution. This original sensor was fabricated by immobilizing the Acinetobacter sp. around gold-coated tilted fiber Bragg gratings (TFBGs). To this aim, the immobilization conditions of bacteria on the gold-coated optical fiber surface were first experimentally determined. Then, the coated sensors were tested in vitro. The relative intensity of the sensor response experienced a change of 1.1 dB for a Cd concentration increase from 0.1 to 1000 ppb. According to our test procedure, we estimate the experimental limit of detection to be close to 1 ppb. Cadmium ions strongly bind to the sensing surface, so the sensor exhibits a much higher sensitivity to Cd than to other heavy metal ions such as Pb, Zn and CrO found in contaminated water, which ensures a good selectivity.
环境监测和饮用水控制是光纤传感解决方案可以优于其他技术的关键应用。在这项工作中，我们报告了一种高灵敏度的等离子体光纤探针，该探针已被开发用于确定溶液中镉离子（Cd）的浓度。这种原始传感器是通过在涂金倾斜光纤布拉格光栅（TFBG）周围固定不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动不动动不动不动不动不动不动不动动不动不动不动不动不动动不动不动不动不动动不动不动动不动不动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动动的动动动动动动动动动动动动动动动动一动 对，就是这个页面的内容
