Results 21 to 30 of about 5,177 (243)

Long Period Fiber Grating Fabrication by Two-Step Infrared Femtosecond Fiber Laser Exposure

IEEE Photonics Journal, 2017
We develop a two-step infrared (IR) femtosecond fiber laser exposure technique to flexibly fabricate long period fiber gratings (LPFGs) with a high peak band-rejection efficiency of 35.4 dB, insertion loss of 4.36 dB, and 3 dB ...
Cong Zhang, Li Cheng, Songnian Fu, Ming Tang, Deming Liu   +4 more
doaj   +1 more source

Fiber Bragg Grating Bonding Characterization under Long-Period Cyclic Loading

Photonics, 2023
The Smart Landing Gear system to be developed in the framework of the ANGELA project provides the strain measurements on landing gear structure at landings, and this system should be maintained efficiently under operational conditions.
Angela Brindisi, Cristian Vendittozzi, Costanzo Bellini, Vittorio Di Cocco, Lidia Travascio, Luigi Di Palma, Marika Belardo, Antonio Concilio   +7 more
doaj   +1 more source

Dynamic Responses Measured by Optical Fiber Sensor for Structural Health Monitoring

Applied Sciences, 2019
An optical fiber sensing system integrating a fiber Bragg grating (FBG) sensor, a long-period fiber grating (LPFG) optical filter and a photodetector is presented to monitor the dynamic response of a structure subjected to base excitation and impact ...
Shiuh-Chuan Her, Shin-Chieh Chung
doaj   +1 more source

Feasibility of Fiber Bragg Grating and Long-Period Fiber Grating Sensors under Different Environmental Conditions

Sensors, 2010
This paper presents the feasibility of utilizing fiber Bragg grating (FBG) and long-period fiber grating (LPFG) sensors for nondestructive evaluation (NDE) of infrastructures using Portland cement concretes and asphalt mixtures for temperature, strain ...
Jian-Neng Wang, Jaw-Luen Tang
doaj   +1 more source

Arc-Induced Long Period Fiber Gratings [PDF]

Journal of Sensors, 2016
Long period fiber gratings produced by the electric arc technique have found an increasing interest by the scientific community due to their ease to fabricate, virtually enabling the inscription in any kind of fiber, low cost, and flexibility. In 2005 we have presented the first review on this subject.
openaire   +2 more sources

Long Period Grating-Based Fiber Coupling to WGM Microresonators

Micromachines, 2018
A comprehensive model for designing robust all-in-fiber microresonator-based optical sensing setups is illustrated. The investigated all-in-fiber setups allow light to selectively excite high-Q whispering gallery modes (WGMs) into optical microresonators,
Francesco Chiavaioli, Dario Laneve, Daniele Farnesi, Mario Christian Falconi, Gualtiero Nunzi Conti, Francesco Baldini, Francesco Prudenzano   +6 more
doaj   +1 more source

Arc-Induced Long-Period Fiber Gratings at INESC TEC. Part II: Properties and Applications in Optical Communications and Sensing

Sensors, 2021
In this work, we review the most important achievements of INESC TEC related to the properties and applications of arc-induced long-period fiber gratings.
Gaspar Rego, Paulo Caldas, Oleg V. Ivanov   +2 more
doaj   +1 more source

Manufacturing and Spectral Features of Different Types of Long Period Fiber Gratings: Phase-Shifted, Turn-Around Point, Internally Tilted, and Pseudo-Random

Fibers, 2017
The manufacturing and spectral features of different types of long period fiber gratings (LPFGs), ranging from phase-shifted, turn-around point, and internally tilted gratings, to pseudo-random gratings, are described and discussed in detail.
Francesco Chiavaioli, Francesco Baldini, Cosimo Trono   +2 more
doaj   +1 more source

Dissimilar-fiber long-period fiber gratings: concept and demonstration

Applied Optics, 2017
A new type of long-period fiber grating structure that contains dissimilar fiber types is proposed. This dissimilar-fiber long-period fiber grating (DF-LPFG) structure is fabricated by splicing together subperiod sections of dissimilar fiber types. Due to the large index differences that can exist between various fiber types, the resulting DF-LPFGs can
Pengfei, Wang, Thomas K, Gaylord
openaire   +2 more sources

A Low-Cost High-Temperature Sensor Based on Long-Period Fiber/Microfiber Gratings by Local Fictive Temperature Modification

Journal of Chemistry, 2020
A high temperature-sensitive long-period fiber grating (LPFG) sensor fabricated by the local fictive temperature modification is proposed and demonstrated.
Guorui Zhou, Chuanchao Zhang, Xiufang Xie, Yi Wan, Caizhen Yao, Jun Liu, Longfei Niu, Xinxiang Miao, Hai Zhou, Xiaodong Jiang, Shizhen Xu, Haibing Lv   +11 more
doaj   +1 more source