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Long-Period Grating with Asymmetrical Modulation for Curvature Sensing

Authors :
Lan Su
Xin Qiu
Rui Guo
Youbo Jing
Chaoshan Yang
Shuhui Liu
Source :
Applied Sciences, Vol 14, Iss 5, p 1895 (2024)
Publication Year :
2024
Publisher :
MDPI AG, 2024.

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.

Details

Language :
English
ISSN :
20763417
Volume :
14
Issue :
5
Database :
Directory of Open Access Journals
Journal :
Applied Sciences
Publication Type :
Academic Journal
Accession number :
edsdoj.8c3731f9d4694c908bd2a2d8ec791610
Document Type :
article
Full Text :
https://doi.org/10.3390/app14051895