(0603735) Fiber Bragg Gratings
Development of a Shock and Detonation Velocity Measurement System Using Chirped Fiber Bragg Gratings
... c.collet@msiac.nato.int (C.C.) * Correspondence: yohan.barbarin@cea.fr Received: 13 January 2020; Accepted: 10 February 2020; Published: 14 February 2020 Abstract: Dynamic measurements of shock and ...
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Accurate index profile measurements for fiber bragg gratings and sensor application
... of Fiber Bragg Gratings (FBGs) is more and more desired in order to improve their spectral and temporal performances in particular for high bite rate transmission ...
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Through-the-coating femtosecond laser inscription of very short fiber Bragg gratings for acoustic and high temperature sensing applications
... short fiber Bragg gratings (FBGs) have already found applications in high-frequency acoustic sensing, where the gauge length of the FBG has to be shorter than half the wavelength of the strain field ...
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Guided wave imaging of composite plates using passive acquisitions by fiber Bragg gratings
... as Fiber Bragg Gratings sensors on optical fibers, which are used in this ...using Fiber Bragg Gratings as receivers, reducing the impact of the acquisition system on the ...
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Shocks Sensing by Fiber Bragg Gratings and a 100 MHz Dynamic Dispersive Interrogator
... yohan.barbarin@cea.fr Abstract — A multi-channels high resolution dispersive interrogator with at a high sampling rate has been developed to measure shocks pressure levels by Fiber Bragg Gratings ...
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Accurate measurements of a wavelength drift in high-temperature silica-fiber Bragg gratings
... Fiber Bragg gratings (FBGs) are, at a first glance, ideally suited to high-temperature measurements in harsh environments due to being small, insensitive to electromagnetic radiation, resistant to ...
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Deep ultraviolet femtosecond laser tuning of fiber Bragg gratings
... https://doi.org/10.1016/j.optcom.2005.08.038 Access and use of this website and the material on it are subject to the Terms and Conditions set forth at Deep ultraviolet femtosecond laser tuning of fiber ...
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Through-the-coating writing of tilted fiber Bragg gratings with the phase mask technique
... Rotating the phase mask about the beam axis (i.e., z-axis), while keeping the phase mask and fiber normal to the incident beam, splits the focal lines in the xy-plane along the y-axis. In this situation, the split ...
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Measurement of index modulation along Fiber Bragg Gratings by Side Scattering and Local Heating methods
... L’archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d’enseignemen[r] ...
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Discovery and Correction of Spatial Non-Uniformity in Optical Fibers: Towards the Fabrication of Perfect Ultra-Long Fiber Bragg Gratings for Applications in Non-Linear Optics
... structure to be both random and of higher reflectance, as shown in Figure 2.14. This induced random spectral structure can be seen as an analogue to Rayleigh scattering, which is also caused by a permanent random ...
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Radiation Vulnerability of Fiber Bragg Gratings in Harsh Environments
... named Bragg wavelength shift, BWS) and a reduc- tion of the peak ...on fiber composition, grating inscription conditions and pre-irradiation treatments [1], so it is necessary to test as more ...
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Temperature Resistant Fiber Bragg Gratings for On-Line and Structural Health Monitoring of the Next-Generation of Nuclear Reactors
... ∆λ Bragg ∆ε [ 1550 nm ] ...the Bragg wavelengths allow transducers identification in the spectral domain, one can easily multiplex several FBG transducers on a single optical fiber, but care has to ...
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Spectral degradation of Type II π-phase-shifted fiber Bragg gratings due to femtosecond laser induced loss
... Fig. 8. Histogram of 35 Type II π-PS-FBG passband bandwidth measurements having grating strength in the range of 14 to 16 dB in transmission. While the above comparison of the experimental and simulated data suggests ...
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High-temperature stable π-phase-shifted fiber Bragg gratings inscribed using infrared femtosecond pulses and a phase mask
... SMF-28 fiber using a third-order mask The results from the previous section demonstrate that by blocking the π-shift one can fabricate quite symmetric Type II FBGs using a 1st-order mask, even when the inscription ...
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Passive guided waves measurements using fiber Bragg gratings sensors
... optical fiber under test which is used to probe the scattering sits distributed all along the ...optical fiber by acoustic signal impinging on the sensing ...the fiber is obtained, making this system ...
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Surface heat flux estimation with embedded fiber Bragg gratings measurements: Numerical study
... L’archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d’enseignemen[r] ...
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High-temperature stable fiber Bragg gratings with ultrastrong cladding modes written using the phase mask technique and an infrared femtosecond laser
... National Research Council of Canada, Security and Disruptive Technologies, 100 Sussex Dr., Ottawa, Ontario K1A 0R6, Canada *Corresponding author: cyril.hnatovsky@nrc-cnrc.gc.ca. Received[r] ...
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Nonlinear photoluminescence imaging applied to femtosecond laser manufacturing of fiber Bragg gratings
... the fiber inside which an FBG is to be ...protective fiber coatings (transjacket FBGs) are ...writing gratings through the fiber coating is desirable since the device maintains the same ...
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Dynamic Strain Measurements by Fiber Bragg Gratings and a 100 MHz Dispersive Spectrometer
... Fig. 2. Sketch of an experimental setup in the case of a ring sample. Fig. 3. 2 nd fiber (vertical) raw spectrogram recording with the BraggPulse. III. DYNAMIC EXPERIMENT One of the goals of the experiment was to ...
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Optimization of detonation velocity measurements using a Chirped Fiber Bragg Grating
... Dynamic measurements of detonation velocity profiles are performed using long Chirped Fiber Bragg Gratings (CFBGs). Such thin probes, with a diameter of typically 150 µm, are inserted directly into a ...
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