Results 81 to 90 of about 7,750 (233)

Evaluation of prestress losses in concrete beams using destructive and non‐destructive methods

Structural Concrete, EarlyView.
Abstract Over the past few decades, prestressing techniques have become essential in the construction of key structures, infrastructure, and bridges. The serviceability and safety of prestressed concrete (PC) elements are closely tied to the effectiveness of the prestressing process.
A. N. Consiglio, G. Muciaccia, G. Rosati
wiley   +1 more source

An investigation of chirped fibre Bragg gratings Fabry-Perot interferometer for sensing applications [PDF]

, 2005
Fibre interferometer configurations such as the Michelson and Fabry-Perot (FP) have been formed using uniformed and chirped Fibre Bragg Gratings (FBG) acting as partial reflectors. As well as increasing the dynamic range of the interferometer, chirped
Cheung, Chi Shing
core  

Interferometric time division FBG interrogator and multiplexer with static, dynamic, and absolute wavelength measurement capabilities [PDF]

, 2012
We report on the design and preliminary testing of an interferometric interrogator capable of large-scale time-division multiplexing of FBG sensors. The scheme employs a passive algorithm for phase demodulation, allowing changes in FBG sensor reflected ...
Philip Orr, Niewczas, Pawel, Paweł Niewczas, Alan Paterson, Paterson, Alan, Orr, Philip   +5 more
core   +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

Radiation tolerant fiber Bragg gratings: review of FBG sensing

Journal of Optics
Abstract Fiber Bragg Gratings (FBGs) have emerged as versatile optical sensors capable of precisely monitoring environmental parameters such as temperature and strain, making them invaluable in harsh radiation environments like space, nuclear facilities, marine systems, and high-energy physics applications. This review critically examines the
Tamana Baba, Norazlina Saidin, Nurul Fadzlin Hasbullah, Ishaq Ahmad   +3 more
openaire   +1 more source

A Dual‐Frequency Sensitivity Model for Optical Fibre Ultrasonic Sensors in Power Transformer Partial Discharge Detection

High Voltage, EarlyView.
ABSTRACT The detection of partial discharges (PD) on the power transformer tank demands higher sensitivity in ultrasonic detection. To target the detection frequency band for sensor optimisation and enhance sensitivity, this paper presents a dual‐frequency sensitivity model for optical fibre ultrasonic sensors.
Sihan Wang, Jihang Sun, Jialin Wang, Bin Wei, Guoming Ma   +4 more
wiley   +1 more source

Solid-state interferometric interrogator and multiplexer for high-speed dynamic and absolute FBG wavelength measurement [PDF]

, 2013
We present a solid-state FBG array interrogator and multiplexer capable of determining absolute FBG wavelengths and of providing high-speed, high-resolution static and dynamic measurements.
Perry, Marcus, Philip Orr, Niewczas, Pawel, Paweł Niewczas, Fusiek, Grzegorz, Marcus Perry, Grzegorz Fusiek, Orr, Philip   +7 more
core   +1 more source

Gas-Flow Sensor using Optical Fiber Bragg Grating(FBG)

Journal of Navigation and Port Research, 2008
We have proposed and demonstrated an gas-flow sensor using optical fiber bragg grating(FEG). The flow sensor has no electronics and no mechanical parts in its sensing part and the structure is th11s simple and immune to electromagnetic interference(EMI). The FEG sensor was consisted qf the sensing element and a coil heater.
Joon-Hwan Shim, Seok-Je Cho, Yung-Ho Yu, Kyung-Rak Sohn   +3 more
openaire   +2 more sources

Embedding Fiber Segment Interferometry for Localization of Defects in Composite Structures

Polymer Composites, Volume 47, Issue 14, Page 12874-12886, 20 July 2026.
Graphical representation of composite structures with embedded fiber optic sensors for structural health monitoring, enabling strain measurement and damage localization under mechanical loading. ABSTRACT In the area of structural health monitoring (SHM), embedding strain sensors into smart composites is a key strategy for detecting failures arising ...
Shiva Mohammadkarimi, Christoph Hemeling, Thomas Kissinger, Florian Puch   +3 more
wiley   +1 more source

The Fundamental of Fiber Bragg Grating (FBG) Sensor

International Journal for Research in Applied Science and Engineering Technology
An optical sensor known as an FBG is produced by laterally exposing a single mode fiber core to a strong UV laser light pattern on a regular basis. The exposure causes a sustained increase in the refractive index (ncore) of the fiber's core, resulting in fixed index modulation called grating (λ).
openaire   +1 more source