Three-Dimensional Vector Accelerometer Using a Multicore Fiber Inscribed With Three FBGs

• DOI: 10.1109/jlt.2021.3058240
• Publication Date: 2021-02-10T10:02:57Z
• Authors: Rui Zhou; Fengyi Chen; Shuangshuang Li; Ruohui Wang; Xueguang Qiao
• Keywords: Inscribed figure

We have designed, fabricated, and characterized a fiber-optic three-dimensional vector accelerometer for vibration measurement. The is based on fiber Bragg gratings (FBGs) inscribed with three cores of seven-core by femtosecond laser phase mask. Through monitoring the wavelength shifts two seven cores, we obtain azimuthal angle acceleration in XY plane reconstruction algorithmic calculation. Similarly, shift core fixed along Z-axis, Z-axis direction. full 3D information about signal obtained synthesis. has achieved working frequency bandwidth from 10 to 220 Hz maximum sensitivity 355 pm/g, best accuracy 0.269 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">°</sup> linear range 0 -100 170 -280 . Moreover, it possible increase overall bandwidth, azimuth sensors adjusting length optical mechanical parameters sensor Z-axis. Such improvements will further enhance application small-scale seismic surveys.