Chengzhi Bao, Chengyu Hong, Dean Sun, Dong Su. Development and Verification of Carbon Fiber Based FBG Earth Pressure Sensors Using Additive Manufacturing Technology[J]. Acta Optica Sinica, 2020, 40(21): 2106002
- Acta Optica Sinica
- Vol. 40, Issue 21, 2106002 (2020)
Fig. 1. Sensing principle of FBG sensor
Fig. 2. FBG pressure sensor fabricated by 3D printing. (a) Process of fabricating FBG pressure sensor by 3D printing; (b) front view of 3D printed model with height of 50%; (c) top view of 3D printed model with height of 50%
Fig. 3. Anisotropic 3D printed material. (a) Microstructure; (b) continuous model
Fig. 4. Calibration test of FBG pressure sensor
Fig. 5. Calibration and stability tests of FBG pressure sensor. (a) Wavelength variation of FBG pressure sensor during calibration test; (b) linear fitting of calibration data; (c) stability test at 1600 kPa
Fig. 6. FBG earth pressure sensors fabricated by 3D printing. (a) Different encapsulating materials; (b) different infilling model sizes; (c) different infilling densities
Fig. 7. Relationship between sensitivity of sensor and infilling density
Fig. 8. Positions of FBG pressure sensors
Fig. 9. Installation and downshifting devices of FBG pressure sensor
Fig. 10. Installation diagram of FBG earth pressure sensor
Fig. 11. Pressure variation of FBG pressure sensor during downshifting. (a) FBG pressure sensor at depth of 8 m; (b) FBG pressure sensor at depth of 12 m
Fig. 12. Pressure monitoring for FBG pressure sensor in engineering site
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