Terahertz-range interrogated grating-based two-axis optical fiber inclinometer
Date of Original Version
We report a two-axis fiber inclinometer fabricated using an ultraweak terahertz-range fiber Bragg grating. Three sensing grating structures were inscribed along a single-mode optical fiber using a femtosecond laser, bound together into a sensing array using thermoformed plastic, and fixed to a two-axis rotational stage. Inclination tests were performed in which the fiber was deflected from 0 to 1.7 deg. These tests were repeated at eight azimuthal angles in increments of 45 deg (from 0 to 315 deg). The standard deviation of the largest inclination angle error was 0.048 deg and the stability of the inclination angle was 0.030 deg.
Chen, Zhen, Gerald Hefferman, Lei Yuan, Yang Song, and Tao Wei. "Terahertz-range interrogated grating-based two-axis optical fiber inclinometer." Optical Engineering 55, 2 (2016). doi:10.1117/1.OE.55.2.026106.