Results 61 to 70 of about 345 (137)

Long-Period Grating with Asymmetrical Modulation for Curvature Sensing

Applied Sciences
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.
Lan Su, Xin Qiu, Rui Guo, Youbo Jing, Chaoshan Yang, Shuhui Liu   +5 more
doaj   +1 more source

A ZnO Nanoparticle-Coated Long Period Fiber Grating as a Carbon Dioxide Gas Sensor

Inventions, 2016
This study proposes a long period fiber grating (LPFG) with a zinc oxide (ZnO) nanoparticle layer for use as a carbon dioxide (CO2) gas sensor. Inductively coupled plasma (ICP) etching, corona treatment, and electrostatic spraying were used to fabricate ...
Chao-Wei Wu, Chien-Chung Wu, Chia-Chin Chiang   +2 more
doaj   +1 more source

Femtosecond Laser-Written Small-Period Long-Period Fiber Grating for an L-Band Normal Dispersion Mode-Locked Fiber Laser

Photonics
We utilize a femtosecond laser-inscribed small-period long-period fiber grating (SP-LPFG) to induce a nonlinear polarization rotation (NPR) effect for mode-locking pulses in a normal dispersion erbium-doped fiber laser (EDFL). The SP-LPFG has a length of
Qianying Li, Peiyun Cheng, Rong Zhao, Xuewen Shu   +3 more
doaj   +1 more source

A Highly Integrated BOTDA/XFG Sensor on a Single Fiber for Simultaneous Multi-Parameter Monitoring of Slopes

Sensors, 2019
A highly integrated sensing technology, combining a stimulated Brillouin scattering-based distributed sensor with XFG (fiber Bragg grating (FBG) and long-period fiber grating (LPFG)) sensors on a single fiber, is proposed for the simultaneous measurement
Feng Li, Weigang Zhao, Hongbin Xu, Shupeng Wang, Yanliang Du   +4 more
doaj   +1 more source

High Strain Sensitivity Temperature Sensor Based on a Secondary Modulated Tapered Long Period Fiber Grating

IEEE Photonics Journal, 2019
A novel sensor structure has been proposed and experimentally investigated for simultaneous strain and temperature measurement. The structure is fabricated by weak power modulation of CO2 laser exposure on tapered long period fiber grating (LPFG ...
Xiren Jin, Cuiting Sun, Shujie Duan, Weiliang Liu, Guoan Li, Shuo Zhang, Xudong Chen, Lei Zhao, Chunlian Lu, Xinghua Yang, Tao Geng, Weimin Sun, Libo Yuan   +12 more
doaj   +1 more source

Controllable all-fiber generation/conversion of circularly polarized orbital angular momentum beams using long period fiber gratings

Nanophotonics, 2018
Mode-division multiplexing (MDM) is a promising technology for increasing the data-carrying capacity of a single few-mode optical fiber. The flexible mode manipulation would be highly desired in a robust MDM network.
Han Ya, Liu Yan-Ge, Wang Zhi, Huang Wei, Chen Lei, Zhang Hong-Wei, Yang Kang   +6 more
doaj   +1 more source

High Temperature Optical Fiber Sensor Based on Compact Fattened Long-Period Fiber Gratings

Sensors, 2013
A compact high temperature fiber sensor where the sensor head consists of a short fattened long period fiber grating (F-LPFG) of at least 2 mm in length and background loss of −5 dBm is reported.
Eduardo Huerta-Mascotte, David Claudio-González, Ana D. Guzmán-Chávez, Juan C. Hernández-García, Roberto Rojas-Laguna, Everardo Vargas-Rodríguez, Julián M. Estudillo-Ayala, Alejandro Martínez-Rios, Ruth I. Mata-Chávez   +8 more
doaj   +1 more source

Multi-Parameter Sensing Device to Detect Liquid Layers Using Long-Period Fiber Gratings

Sensors, 2018
Insoluble liquids show layers such as water and oil. The detection of the exact interface locations and the level changes for layered liquids are of paramount importance for chemistry purifications, liquid storage in reservoirs, oil transportation, and ...
Zhihui Pan, Ying Huang, Hai Xiao
doaj   +1 more source

Displacement sensor with a wide dynamic range based on a balloon-like long-period fiber grating

Zhongguo Jianchuan Yanjiu
ObjectiveAiming at the problem of the narrow dynamic range of current optical fiber displacement sensors, a balloon-like long-period fiber grating (LPFG) displacement sensor with a simple structure and easy preparation method is designed. MethodsBased on
Pu CHENG, Huiling QIN, Liang PU
doaj   +1 more source

Highly Sensitive Refractive Index Optical Fiber Sensors Fabricated by a Femtosecond Laser

IEEE Photonics Journal, 2011
Highly sensitive and robust refractive index (RI) fiber sensors are proposed, which are based on concatenating two micro air-cavities. The micro air-cavities embedded in the fiber along the core axis are fabricated by combining the techniques of ...
Jinpeng Yang, Lan Jiang, Sumei Wang, Qianghua Chen, Benye Li, Hai Xiao   +5 more
doaj   +1 more source