Results 51 to 60 of about 16,245 (165)
Sensing characteristics of structural microfiber long-period gratings
Optics Express, 2023 We present a detailed investigation into the sensing characteristics of a structural microfiber long-period grating (mLPG) sensor. By spirally winding a thinner microfiber to another thicker microfiber, periodic refractive index modulation is formed while the optical signal transmitted in the thicker microfiber is resonantly coupled out to the thinner ...
Yuchen Ge +4 more
openaire +2 more sources
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 +4 more
doaj +1 more source
Tunable Filters Based on Cascaded Long-Period Polymer Waveguide Gratings
Photonic Sensors, 2022 Long-period waveguide grating based filters have attracted attention due to their flexible fabrication, a variety of materials and structures, low back reflection, low insertion loss, and excellent performance in the tuning range and temperature ...
Xin Shi, Rui Cao, Lingfang Wang
doaj +1 more source
Application of long-period-grating sensors to respiratory plethysmography [PDF]
Journal of Biomedical Optics, 2007 A series of in-line curvature sensors on a garment are used to monitor the thoracic and abdominal movements of a human during respiration. These results are used to obtain volumetric tidal changes of the human torso in agreement with a spirometer used simultaneously at the mouth. The curvature sensors are based on long-period gratings (LPGs) written in
Allsop, Thomas D.P. +5 more
openaire +2 more sources
Advanced Electromagnetics, 2018 In this paper, a high sensitivity temperature sensor based on photonic crystal fiber long period grating (PCF-LPG) filled with ethanol is proposed and simulated by full vector finite element method. The relationship between the resonant wavelength shift,
R. Boufenar, M. Bouamar, A. Hocini
doaj +1 more source
High-Order Modes Micro-Knot Excited by a Long-Period Fiber Grating
Sensors, 2017 We suggest a fiber micro-knot fabricated on a long-period fiber grating. The long-period fiber grating excites high-order modes into the micro-knot and transfers the output back to the Gaussian mode.
Shir Shahal +2 more
doaj +1 more source
Ultra-Broadband Mode Converter Using Cascading Chirped Long-Period Fiber Grating
IEEE Photonics Journal, 2019 We propose and demonstrate an ultra-broadband mode converter based on a cascade chirped long-period fiber grating (CLPFG) written in a two-mode fiber.
Mao Feng +4 more
doaj +1 more source
EPJ Web of Conferences, 2010 We propose here the monitoring of the Liquid Resin Infusion (LRI) process for using a superimposed long period (LPG) and short period (FBG) Bragg grating sensor.
Robert L. +3 more
doaj +1 more source
Application of Robust, Packaged Long-Period Fiber Grating for Strain Measurement
Micromachines, 2016 This paper proposes an optical fiber strain sensor based on packaged long-period fiber gratings (PLPFG) which is fabricated by the micro-electromechanical systems (MEMS) process and packaged with poly-dimethylsiloxane (PDMS) polymer materials.
Ke-Ping Ma +4 more
doaj +1 more source
Measurement + Control, 2020 The paper reports an adaptive-network-based fuzzy inference system for the measurement of axial strain using long-period fiber grating sensors. The long-period fiber grating sensor supports optical resonances, which are sensitive to the change of axial ...
Xingliu Hu +3 more
doaj +1 more source