Results 81 to 90 of about 15,020 (231)

Static Vertical Displacement Measurement of Bridges Using Fiber Bragg Grating (FBG) Sensors [PDF]

Advances in Structural Engineering, 2013
Vertical displacements are one of the most relevant parameters for structural health monitoring of bridges in both the short and long terms. Bridge managers around the globe are always looking for a simple way to measure vertical displacements of bridges. However, it is difficult to carry out such measurements. On the other hand, in recent years, with
Yau, Man, Chan, Tommy, Thambiratnam, David, Tam, Hwa-Yaw   +3 more
openaire   +2 more sources

Optical Fiber‐Based Versatile Wearable Force Myography System: Application to Human–Robot Interaction

Advanced Intelligent Systems, EarlyView.
A compact and flexible wearable force myography sensor based on optical fiber technology detects muscle activity through pressure‐induced light loss. The sensor offers high sensitivity for detecting subtle force and finger motion changes, along with excellent signal stability under dynamic and sweating conditions.
Chongyoung Chung, Heeju Mun, Seyed Farokh Atashzar, Ki‐Uk Kyung   +3 more
wiley   +1 more source

Fabrication of Fiber Bragg Grating Coating with TiO2 Nanostructured Metal Oxide for Refractive Index Sensor

Journal of Nanotechnology, 2017
To increase the sensitivity of biosensor a new approach using an optical fiber Bragg grating (FBG) coated with a suitable nanostructured metal oxide (NMO) is proposed which is costly effective compared to other biosensors.
Shaymaa Riyadh Tahhan, Rong Zhang Chen, Sheng Huang, Khalil I. Hajim, Kevin P. Chen   +4 more
doaj   +1 more source

Highly Versatile Real‐Time Optical Noise Filtering Through Temporal Cloaking

Laser &Photonics Reviews, EarlyView.
Conventional bandpass filtering strategies may be insufficient for recovering optical waveforms under extremely noisy conditions. We demonstrate a temporal‐cloaking denoising strategy enabled by the temporal Talbot effect, which concentrates the coherent signal of interest into short temporal slots while broadband noise remains temporally spread.
Majid Goodarzi, Manuel P. Fernandez, Geunweon Lim, Connor Rowe, Xinyi Zhu, José Azaña   +5 more
wiley   +1 more source

Fiber Bragg grating monitors for thermal and stress of the composite insulators in transmission lines

Global Energy Interconnection, 2018
Running composite insulators are prone to failure due to their harsh surrounding work environment, which directly affects the safe operation of transmission lines.
Heming Deng, Wei Cai, You Song, Jinsong Liu, Christopher Redman, Qiandong Zhuang   +5 more
doaj   +1 more source

A High Sensitive Micro-Seismic Fiber Bragg Grating(FBG) Sensor System

Procedia Engineering, 2011
AbstractA high sensitive micro-seismic fiber Bragg grating (FBG) sensor system based on narrow line width distributed feedback (DFB) laser is realized by using filtering demodulation. Sensitivity of micro-seismic FBG sensor lies on the structure of the sensor shell and the shape of the reflectivity spectrum of FBG.
Wang, Jin-Yu, Song, Guang-Dong, Liu, Xiao-Hui, Wang, Chang, Liu, Tong-Yu   +4 more
openaire   +1 more source

Exploring Thermal and Mechanical Strains During Laying Down Process in Fused Filament Fabrication

Macromolecular Materials and Engineering, EarlyView.
This study analyzes strain evolution and thermal behavior during FFF of PLA using strain gauges and infrared imaging. Microstrain levels depend on printing conditions, with adhesion‐induced compression during cooling and peak strains in early layers. Microtomography shows minimal porosity, while thermal imaging reveals rapid heat penetration, strong ...
Boubakeur Mecheri, Jaianth Vijayakumar, Elodie Boller, Sofiane Guessasma   +3 more
wiley   +1 more source

Strain Development During Cure of Partially Pre‐Cured Thermosetting Composites Measured With Distributed Fiber Optic Sensors

Polymer Composites, EarlyView.
Schematic representation of the beneficial effect of ply pre‐curing on temperature overshoot, internal strain and warpage during cure of thin and thick thermosetting composites. ABSTRACT Detection of manufacturing‐induced defects in thermosetting composites is crucial to guarantee part quality, safety, and improve manufacturing efficiency.
Francesco Taddei, Giacomo Struzziero, Valentin Ott, Véronique Michaud   +3 more
wiley   +1 more source

Fiber Bragg Grating sensors for deformation monitoring of GEM foils in HEP detectors

, 2015
Fiber Bragg Grating (FBG) sensors have been so far mainly used in high energy physics (HEP) as high precision positioning and re-positioning sensors and as low cost, easy to mount, radiation hard and low space- consuming temperature and humidity devices.
Benussi, L., Bianco, S., Caponero, M., Muhammad, S., Passamonti, L., Piccolo, D., Pierluigi, D., Raffone, G., Russo, A., Saviano, G.   +9 more
core   +1 more source

Upconversion Photoluminescence to Monitor Local Heat Release During Femtosecond Direct Laser Writing of Bioinks In Situ

Small Methods, EarlyView.
Upconversion nanoparticle photoluminescence was used to quantify heat burden during femtosecond direct laser writing of bioinks in real time. Transient temperature spikes above 120–140°C demonstrate the need for a stringent process optimization, and fast 20 µm/s scan speeds were established to maintain physiological conditions.
Amirbahador Zeynali, Giuseppe Chirico, Michael Heymann   +2 more
wiley   +1 more source