Two-dimensional fiber-optic vector vibroscope using only one multi-mode tilted fiber grating
Orientation-recognized two-dimensional vibration sensor based on a polarization-controlled cladding-to-core recoupling is demonstrated experimentally. A compact structure in which a short section of multi-mode fiber stub containing a weakly tilted fiber Bragg grating (TFBG) is spliced to another single-mode fiber without any lateral offset. Several well defined lower-order cladding resonances in reflection show different polarization dependence due to the tilted grating vector excitation. Both orientation and amplitude of the vibration can be determined unambiguously via dual-path power detection of the orthogonal-polarimetric odd-cladding-modes. Meanwhile, the unwanted power fluctuations and temperature perturbations can be definitely removed via core mode monitoring.
|Keywords||Fiber grating, Optical fiber sensor, Vector vibroscope|
|Conference||22nd International Conference on Optical Fiber Sensors|
Guo, T, Ran, Y. (Yang), Tan, Y. (Yannan), Gao, S. (Shuai), Sun, L. (Lipeng), Guan, B.-O. (Bai-Ou), & Albert, J. (2012). Two-dimensional fiber-optic vector vibroscope using only one multi-mode tilted fiber grating. Presented at the 22nd International Conference on Optical Fiber Sensors. doi:10.1117/12.970483