Yue Pan, Jiajia Song, Zhichong Wang, Chunyong Sun, Chuan Gan. Design and Research on Variable Cross-section Cantilever Fiber Bragg Grating Pressure Sensor[J]. Laser & Optoelectronics Progress, 2022, 59(1): 0106006
- Laser & Optoelectronics Progress
- Vol. 59, Issue 1, 0106006 (2022)
Fig. 1. Structure diagram of sensor
Fig. 2. Stress diagram of cantilever beam with constant section and variable section. (a) Constant cross-section cantilever beam; (b) variable cross-section cantilever beam
Fig. 3. Stress diagram of diaphragm
Fig. 4. Free end offset of cantilever beam with different thickness increasing with free end thickness
Fig. 5. Free end offset nephogram of 0.25 mm cantilever beam under 1 MPa pressure
Fig. 6. Finite element analysis of cantilever beam structure. (a) Variable cross-section beam structure; (b) constant cross-section beam structure
Fig. 7. Relationship between sensitivity and parameters of different structures and materials. (a) Effective length of fiber Bragg grating; (b) Poisson's ratio; (c) elastic modulus; (d) radius of dowel; (e) radius of diaphragm; (f) length from fixed end to stressed point; (g) diaphragm thickness
Fig. 8. Comparison of influence curves of material parameters on sensitivity between numerical analysis and finite element analysis. (a) Radius of diaphragm; (b) diaphragm thickness
Fig. 9. Comparison of force and wavelength fitting curves of different structures
Fig. 10. Curve of fiber grating deformation under different pressures
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Table 1. Structure and material parameters of FBG sensor
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