Research On FBG Strain Sensor Based On Parametric Design And Additive Manufacturing Technology

With the rapid development of Fiber Bragg Grating sensing technology,Fiber Bragg Grating sensor is very suitable for health monitoring of building structures because of its high sensitivity,anti-electromagnetic interference,small size,construction of quasi-distributed sensing network,corrosion resistance and other advantages.Additive manufacturing technology,commonly known as 3D printing technology,is an advanced manufacturing technology that has developed rapidly in the past 30 years.Its advantage lies in the rapid and free manufacturing of 3D structures.Is proposed in this paper based on an increase of material manufacturing technology of Fiber Bragg Grating sensor encapsulation method,designed the two kinds of Fiber Bragg Grating strain sensor and encapsulated by increasing material manufacturing technology,the strain transfer mechanism was deduced and analyzed the factors that influence the strain transfer ratio of the sensor performance test,according to the result of the experiment compared the different design parameters on the sensor performance,the influence of work done specific as follows:The composition of Fiber Bragg Grating and its sensing mechanism are described,the strain and temperature sensing models of Fiber Bragg Grating under axial force are established,and the temperature compensation method and strain sensor calibration method of Fiber Bragg Grating are proposed.A new packaging method of Fiber Bragg Grating strain sensor based on additive manufacturing is proposed,and various packaging methods of Fiber Bragg Grating strain sensor are compared.Using Revit parameter were respectively developed parameterized clamping type material manufacturing Fiber Bragg Grating strain sensor,surface paste type materials manufacturing Fiber Bragg Grating strain sensor,and two kinds of sensors with different parameters are respectively carried out experiment,to get the strain-wavelength change curve,sensor static characteristic indexes are given according to the calibration results,compared the influence of different parameters design of sensor static characteristics.The Fiber Bragg Grating strain sensor made of clamped additive was applied to the axial compression performance test of the composite confined concrete column with embedded steel reinforcement to monitor the change of axial strain on the surface of the concrete column during the test loading process,and the results of strain gauge measurement were compared and analyzed.For application to add material manufacturing technology of Fiber Bragg Grating strain sensor strain transfer characteristics were analyzed,and through the optical fiber and the increase of material layer infinitesimal body stress analysis and deformation compatibility condition,increase material layer inside and outside surface strain transfer ratio is deduced from the formula,and analyze the different material modulus,radius,packaging distance,clamping distance to increase material manufacturing Fiber Bragg Grating strain sensor strain transfer rate.In this study,additive manufacturing technology and parametric design were innovatively introduced into the design of Fiber Bragg Grating strain sensor,making the sensor design more flexible and easy to customize,and avoiding the bubble defect of the previous sensor bonding section.It provides a reference theoretical basis and case analysis for optimal design,sensitivity adjustment and new packaging method of Fiber Bragg Grating strain sensor.