A fiber sensing system based on the hybrid structure for metal ion detection and stress interference decoupling

Subject of study. The design concept of fiber metal ion detectors and wind-blast pressure in water flow is studied. Purpose of the work. The purpose is to sensitize a fiber sensor in relation to the concentration of metal ions in a fluid and pressure due to water flow. Method. Through theoretical analyses and computer and physical simulations, the sensitivity of a sensor consisting of a metal ion concentration meter, transitive D-shaped fiber module, and fluid flow pressure meter based on a fiber grating is investigated. Main results. As a result of metal ion concentration measurement experiments, it has been proved that the device reaches a response sensitivity of metal ion concentration of the order of 10 5 nm⋅ml/mol. In addition, the sensitivity of the metal ion concentration response is ensured to be of the order of 10 5 nm⋅ml/mol, and the device is experimentally investigated for sensing characteristics of axial strain and bending deformation. Practical significance. The design concept and calculation methods of a metal ion concentration and fluid flow pressure stress sensor have been developed; the sensor can be used for ecological monitoring of natural water environments.