학술논문
Torsion Sensor Based on Helical Long-Period Grating Inscribed in the Etched Double Cladding Fiber
Document Type
Periodical
Source
IEEE Sensors Journal IEEE Sensors J. Sensors Journal, IEEE. 24(8):12441-12448 Apr, 2024
Subject
Language
ISSN
1530-437X
1558-1748
2379-9153
1558-1748
2379-9153
Abstract
We proposed a high-sensitivity torsion sensor based on the helical long-period grating (HLPG) inscribed in the cladding-etched double cladding fiber (DCF). The torsion sensitivity has been greatly improved by reducing the cladding diameter of the DCF, from 0.342 to 1.162 nm/(rad/m), which is one order of magnitude higher than that of the conventional long-period fiber grating (LPFG). The cladding mode coupling characteristics during the etching process are also investigated experimentally. The DCF-HLPG has a low strain and temperature sensitivity, and the maximum strain sensitivity is only about 0.0022 nm/ $\mu \varepsilon $ . The proposed DCF-HLPG has a potential application as a high-sensitivity torsion sensor with low strain and temperature crosstalk.