Results 91 to 100 of about 6,027 (232)

Fiber Bragg Gratings for Medical Applications and Future Challenges: A Review

IEEE Access, 2020
In the last decades, fiber Bragg gratings (FBGs) have become increasingly attractive to medical applications due to their unique properties such as small size, biocompatibility, immunity to electromagnetic interferences, high sensitivity and multiplexing
Daniela Lo Presti, Carlo Massaroni, Catia Sofia Jorge Leitao, Maria De Fatima Domingues, Marzhan Sypabekova, David Barrera, Ignazio Floris, Luca Massari, Calogero Maria Oddo, Salvador Sales, Iulian Ioan Iordachita, Daniele Tosi, Emiliano Schena   +12 more
doaj   +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

Analysis of Simulated Reflection Characteristics of Uniform and Apodized Fiber Bragg Gratings

Advances in Electrical and Electronic Engineering, 2008
In this paper, the simulations of the reflectance of the uniform and apodized fiber Bragg gratings (FBG) are presented. The simulations are based on the coupled–mode theory. The simulated reflectances of FBGs with different lengths and the modulations of
Erik Gemzicky, Jarmila Mullerova
doaj  

A High-Temperature Fiber Sensor Using a Low Cost Interrogation Scheme

Sensors, 2013
Regenerated Fibre Bragg Gratings have the potential for high-temperature monitoring. In this paper, the inscription of Fibre Bragg Gratings (FBGs) and the later regeneration process to obtain Regenerated Fiber Bragg Gratings (RFBGs) in high-birefringence
Salvador Sales, David Barrera
doaj   +1 more source

Random raman fiber laser based on a twin-core fiber with FBGs inscribed by femtosecond radiation [PDF]

, 2019
Narrowband Raman lasing in a polarization-maintaining two-core fiber (TCF) is demonstrated. Femtosecond point-by-point inscription of fiber Bragg gratings (FBGs) in individual cores produces a half-open cavity with random distributed feedback.
Abdullina, S. R., Babin, S. A., Dostovalov, A. V., Lobach, I. A., Skvortsov, M. I., Vlasov, A. A., Wabnitz, S., Wolf, A. A.   +7 more
core   +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

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

Multiwavelength Hybrid Fiber Raman/Parametric Linear Oscillator

IEEE Photonics Journal, 2015
We demonstrate a linear cavity wideband multiwavelength fiber-based optical parametric oscillator consisting of four fiber Bragg gratings (FBGs). The FBGs center wavelengths are chosen such that they are 3.2 THz (26 nm) and 14.3 THz (115 nm) away from ...
L. T. Lim, K. S. Yeo, M. H. Abu Bakar, N. Tamchek, F. R. Mahamd Adikan, M. A. Mahdi   +5 more
doaj   +1 more source

Optical Fiber Sensors for Aircraft Structural Health Monitoring [PDF]

, 2015
Aircraft structures require periodic and scheduled inspection and maintenance operations due to their special operating conditions and the principles of design employed to develop them.
Aldabaldetreku Etxeberria, Gotzon, Durana Apaolaza, Gaizka, García Esteban-Barcina, Iker, Illarramendi Leturia, María Asunción, Villatoro Bernardo, Agustín Joel, Zubia Zaballa, Joseba Andoni   +5 more
core   +2 more sources

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