Bragg gratings in optical fibers

Othonos, Andreas; Kalli, Kyriacos

doi:10.1016/b978-012513745-4/50080-9

Cited by 9 publications

(5 citation statements)

References 400 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This indicates that a distribution of relaxation times is present and is consistent with thermal relaxation observed in B/Ge fibre [14]. Furthermore, this is in keeping with the broader distribution of trap states for gratings in hydrogen-loaded fibre, which extend to low-energy states that are subject to faster decay at the annealing temperature [12,16]. The decays eventually coincide in our data (figure 5), as would the decay rates under extended exposure time to temperature.…”

Section: Discussionsupporting

confidence: 88%

Blank beam fabrication of regenerated type IA gratings

Simpson

Kalli

Zhou

et al. 2004

Meas. Sci. Technol.

Self Cite

View full text Add to dashboard Cite

We demonstrate an idealized method for the fabrication of regenerated type IA fibre Bragg gratings using commonly available apparatus. We use this technique to show that gratings written in the same fibre with the same period may have central wavelengths which are 14.4 nm apart and have an +11.5% and −1.2% difference in temperature and strain coefficients, respectively. We use these results to show that temperature compensated dual grating sensor heads, of an arbitrary length, may be quickly and consistently manufactured.

show abstract

Section: Discussionsupporting

confidence: 88%

Blank beam fabrication of regenerated type IA gratings

Simpson

Kalli

Zhou

et al. 2004

Meas. Sci. Technol.

Self Cite

View full text Add to dashboard Cite

show abstract

“…Fibre Bragg gratings (FBGs) are widely known for their application in sensing [1,2], especially as embeddable smart sensors for monitoring strain, temperature, bending, loading and cracking in numerous engineering structures [3]. They have a wide range of application advantages over traditional electric sensors such as light-weight, immunity to electromagnetic interference, working in harsh environment conditions, etc.…”

Section: Introductionmentioning

confidence: 99%

Search for black holes

Черепащук

2003

Phys.-Usp.

View full text Add to dashboard Cite

Smart structure sensors based on embedded fibre Bragg grating (FBG) arrays in aluminium alloy matrix by ultrasonic consolidation (UC) technique have been proposed and demonstrated successfully. The temperature, loading and bending responses of the embedded FBG arrays have been systematically characterized. The embedded FBGs exhibit an average temperature sensitivity of ∼36 pm • C −1 , which is three times higher than that of normal FBGs, a bending sensitivity of 0.73 nm/m −1 and a loading responsivity of ∼0.1 nm kg −1 within the dynamic range from 0 kg to 3 kg. These initial experimental results clearly demonstrate that the UC produced metal matrix structures can be embedded with FBG sensor arrays to become smart structures with capabilities to monitor the structure operation and health conditions in applications.

show abstract

“…The reflected signal of one particular wavelength gets constructively added in phase from each grating while the others get cancelled out. The centre wavelength of the reflected signal is called the resonant/reflected Bragg wavelength (λ B ) [19] and is governed by the equation ( 1)…”

Section: Fbgs: Principle and Fabrication Techniquesmentioning

confidence: 99%

Fiber grating sensors and their recent applications in biomedical domain

Kavitha

Pant

Sood

et al. 2023

J. Opt.

View full text Add to dashboard Cite

AbstractSensors play an important role in measuring various physio chemical and biological parameters. Biomedical applications of sensors include early level diagnosis of diseases, treatment technique enhancement and also monitoring the effect of medical techniques using suitable biomedical devices. The sensors which are deemed suitable for biomedical applications need to be fast, accurate, flexible, small, and most importantly, biocompatible. The inherent advantages of fiber optic sensors, such as small foot print, electrical passiveness, multiplexing capability and fast response make them the most preferred for biomedical sensing applications. Fiber optics sensors are generally used in the measurement of parameters such as temperature, strain, pressure, displacement, angle, and force. and find applications in diverse regimes like structural health monitoring, shape sensing, seismic sensing; in the bio medical domain, they have been deployed in gait analysis, pulse rate monitoring, body joint angle measurements, acquisition of respiratory parameters, cardiovascular parameters and many more. Despite being a topic of significant interest in biomedical applications, the adoptablility of optical sensors in clinical practice is not very encouraging. Hence, there is a need to address the reasons for the same, and the present review aims to highlight some critical areas. The present review paper primarily discusses the optical fibre grating techniques: their fabrication methods, the applications of these sensors in biophysical and biomechanical measurements, bio proteins and biomarker detection in body fluids. The review also discusses the bottlenecks in the clinical application of these sensors. The comparison of the performance of the optical fibre sensors with other sensing techniques is also discussed in this review paper.

show abstract

Bragg gratings in optical fibers

Cited by 9 publications

References 400 publications

Blank beam fabrication of regenerated type IA gratings

Blank beam fabrication of regenerated type IA gratings

Search for black holes

Fiber grating sensors and their recent applications in biomedical domain

Contact Info

Product

Resources

About