Abstract

We experimentally proposed a helical long-period fiber grating (HLPG), which was produced by twisting a tri-hole fiber (THF) with arc discharge technology. The optical field distribution in THF-HLPG was analyzed and its transmission spectrum was studied. The simulation results prove that the light wave propagating along the fiber core can be strongly coupled into cladding modes within a short transmission distance, thus making the THF-HLPG more compact. In the experiment, a sensor with a length of 4.2 mm was manufactured by using an arc heating system. With this processing device, the air holes of the THF-HLPG can effectively avoid shrinkage during heating. Temperature, strain, torsion and curvature properties were investigated experimentally. Owing to the peculiarity of THF-HLPG, this sensor shows a high mechanical response and is suitable for identifying curvature changes with a large bending radius. The demonstrated THF-HLPG offers a promising application for precisely detecting mechanical deformation of micro-structure.

Ultra-compact strain- and temperature-insensitive torsion sensor based on a line-by-line inscribed phase-shifted FBG

Bo Huang and Xuewen Shu
Opt. Express 24(16) 17670-17679 (2016)

Strain-insensitive micro torsion and temperature sensor based on a helical taper seven-core fiber structure

Junneng Guan, Shujie Xu, Shiyu Liu, Guitian Qiu, Zhongchao Wei, Chunhua Tan, Faqiang Wang, and Hongyun Meng
Opt. Express 32(6) 10461-10478 (2024)

Negative curvature hollow core fiber sensor for the measurement of strain and temperature

Marta S. Ferreira, Jörg Bierlich, Jens Kobelke, João L. Pinto, and Katrin Wondraczek
Opt. Express 29(4) 5808-5818 (2021)

Transverse-load, strain, temperature, and torsion sensors based on a helical photonic crystal fiber

Cailing Fu, Yiping Wang, Shen Liu, Zhiyong Bai, Jian Tang, Laipeng Shao, and Xueya Liu
Opt. Lett. 44(8) 1984-1987 (2019)

Torsion and strain simultaneous measurement using a cascaded helical long-period grating

Lunlun Xian, Dongdong Wang, and Li Li
J. Opt. Soc. Am. B 37(5) 1307-1311 (2020)