Full-Range Displacement Sensor with Dual FBGs Combined Cantilever Beam Based on Magnetic Grating

• DOI: 10.1364/opticaopen.25956205
• Publication Date: 2024-06-03T08:24:43Z
• Authors: Lidan Lu; Liu jianxin; guang chen; Lianqing Zhu; Chen Weiqiang; An Chunhua; chu Daping
• Keywords: Sine wave; Fiber Bragg Grating; Linearity

We propose a full-range displacement sensor system based on double fiber Bragg gratings (FBGs) with cantilever beam. This adopts magnetic scale as new transmission mechanism. By combining simple and low-cost beam structure makes the sensing probe very easy to realize. The optimal gap was explored through multiple sets of numerical simulations. experiment proved sine relationship between center wavelength shifts FBGs linear displacement, proving feasibility this method. Results indicate that amplitude tensile compression load are 169.76 με 296.12 με. fitting linearity sinusoidal function at an air 3.5 mm is 0.9663 0.9566. direction motion can be determined by phase difference two FBGs. Moreover, realize effect temperature compensation. Thus, achieve non-contact, temperature-independent, measurements. It also exploited measure other parameters such angular velocity, acceleration, field strength.