We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Long-Period Grating with Asymmetrical Modulation for Curvature Sensing.
- Authors
Su, Lan; Qiu, Xin; Guo, Rui; Jing, Youbo; Yang, Chaoshan; Liu, Shuhui
- Abstract
We propose and demonstrate a curvature sensor based on long-period fiber grating (LPFG) with asymmetric index modulation. The LPFG is fabricated in single-mode fiber with femtosecond laser micromachining. The grating structure is not introduced in the central fiber core, but is located off-axis with a distance of a few micrometers. Experimental results indicate that the offset distance has direct influence on the grating spectra. By utilizing such an asymmetric structure, two-dimensional vector curvature sensing can be realized. For an LPFG with an offset distance of 6 μm, the curvature sensitivity is around 29 nm/m−1 in the 0° and 180° direction and about 20 nm/m−1 in the 90° and 270° direction. The difference in curvature sensitivity in different bending directions makes the sensor capable of distinguishing the curvature orientation. The temperature response of the sensor is also experimentally investigated, and results indicate that the sensor has a very low temperature cross-sensitivity of 0.003 m−1/°C. The characteristics of high curvature sensitivity, two-dimensional bending direction identification, and compact structure make the device an ideal candidate to be applied in the field of power grid health monitoring and intelligent robotics.
- Subjects
CURVATURE; TEMPERATURE sensors; FIBER lasers; ELECTRIC power distribution grids; FEMTOSECOND lasers; MICROMACHINING; LOW temperatures; SINGLE-mode optical fibers
- Publication
Applied Sciences (2076-3417), 2024, Vol 14, Issue 5, p1895
- ISSN
2076-3417
- Publication type
Article
- DOI
10.3390/app14051895