Stability of Fiber Bragg Gratings Fabricated Using UV Ar+ and ArF Excimer in Bismuth-Aluminum-co-Doped Silica Fibers

2014 ◽  
Author(s):  
Georgios Violakis ◽  
Hans G. Limberger ◽  
Valery M. Mashinsky ◽  
Evgeny M. Dianov
Keyword(s):  
Fiber Bragg Gratings ◽  
Bragg Gratings ◽  
Silica Fibers ◽  
Co Doped

scholarly journals Strain Measurement on Cracks Using Fiber Bragg Gratings for Use in Aircraft Composite Skin Repairs

Aerospace ◽  
2020 ◽  
Vol 7 (9) ◽  
pp. 138
Author(s):  
Aris A. Ikiades
Keyword(s):  
Spectral Characteristics ◽  
Fiber Bragg Gratings ◽  
Bragg Gratings ◽  
Stress Fields ◽  
Composite Repair ◽  
Local Stresses ◽  
Fbg Sensors ◽  
Critical Components ◽  
Co Doped

Fiber Bragg grating (FBG) sensors have been widely used for measurements of strain and temperature in a host of different applications, including aerospace in composite wings, fuselage structures, and other critical components. Here, we report on a method to measure highly localized intense stress fields, generated at the initialization point of a crack, or crack-tip, using Fiber Bragg Gratings (FBG) inscribed in highly photosensitive hydrogenated germanium and boron co-doped fiber. From the spectral characteristics of short and long FBGs, bonded on a test aluminum coupon with a crack, which simulated damaged skins of an aircraft, the local stresses near the cracks were measured and assessed. As a case study, bespoke composite repair patches were designed and bonded on a coupon, incorporating a number of gratings to monitor the stress distribution with applied force in the composite patch, near the crack.

scholarly journals Highly Reflective Fiber Bragg Gratings Inscribed in Ce/Tm Co-Doped ZBLAN Fibers

2013 ◽  
Vol 25 (11) ◽  
pp. 1066-1068 ◽  
Author(s):  
Mohammed Saad ◽  
Lawrence R. Chen ◽  
Xijia Gu
Keyword(s):  
Fiber Bragg Gratings ◽  
Bragg Gratings ◽  
Co Doped

Fabrication of Fiber Bragg Gratings in High Germania Boron Co-doped Optical Fiber by the Phase Mask Method

2012 ◽  
Author(s):  
Sulaiman Wadi Harun ◽  
Prabakaran Poopalan ◽  
Harith Ahmad
Keyword(s):  
Optical Fiber ◽  
Key Words ◽  
Continuous Wave ◽  
Uv Light ◽  
Fiber Bragg Gratings ◽  
Bragg Gratings ◽  
Phase Mask ◽  
Uv Laser ◽  
Bragg Wavelength ◽  
Co Doped

Kaedah untuk menghasilkan peranti FBG yang mempunyai peratus pantulan yang tinggi diperkenalkan. Peranti FBG telah dicetak dalam gentian optik khas yang mengandungi germanium dan boron yang tinggi. Kandungan germanium ion di dalam gentian optik teras adalah sebanyak mol 20%. Cara yang digunakan ialah cara percetakan topeng fasa dengan menggunakan cahaya ultra ungu ion yang mempunyai panjang gelombang 244 nm sebagai sumber cahaya. Kami telah berjaya menghasilkan FBG yang mempunyai peratus pantulan setinggi 99.9% dan masa yang diambil untuk cetakan adalah kurang daripada 10 minit. Kata kunci: gentian optik; peranti FBG; laser UV; panjang gelombang Bragg; topeng fasa A technique to fabricate high reflectivity fiber Bragg gratings (FBGs) with minimal optics is presented. The FBG is written in high germania boron co-doped optical fiber using a phase mask with a 244 nm continuous-wave UV light as the printing source. The mol percentage of germania ion in the fiber core is about 20%. We have successfully fabricated FBGs with reflectivity as high as 99.9% in less than 10 minutes of exposure time. Key words: Optical fiber; fiber Bragg grating; UV laser; Bragg wavelength; phase mask

Femtosecond pulse-induced fiber Bragg gratings for in-core temperature measurement in optically pumped Yb-doped silica fibers

2012 ◽  
Vol 285 (21-22) ◽  
pp. 4387-4390 ◽  
Author(s):  
Martin Leich ◽  
Julia Fiebrandt ◽  
Anka Schwuchow ◽  
Sonja Unger ◽  
Sylvia Jetschke ◽  
...  
Keyword(s):  
Temperature Measurement ◽  
Core Temperature ◽  
Femtosecond Pulse ◽  
Fiber Bragg Gratings ◽  
Bragg Gratings ◽  
Optically Pumped ◽  
Silica Fibers

scholarly journals Fabrication and thermal decay of fiber Bragg gratings in pristine and H_2-loaded Bi-Al co-doped optical fibers

2011 ◽  
Vol 19 (26) ◽  
pp. B350 ◽  
Author(s):  
Georgios Violakis ◽  
Hans G. Limberger ◽  
Valery M. Mashinsky ◽  
Evgeny M. Dianov
Keyword(s):  
Optical Fibers ◽  
Fiber Bragg Gratings ◽  
Bragg Gratings ◽  
Thermal Decay ◽  
Co Doped

scholarly journals Medical Range Radiation Dosimeter Based on Polymer-Embedded Fiber Bragg Gratings

Sensors ◽  
2021 ◽  
Vol 21 (23) ◽  
pp. 8139
Author(s):  
Marie-Anne Lebel-Cormier ◽  
Tommy Boilard ◽  
Martin Bernier ◽  
Luc Beaulieu
Keyword(s):  
Low Dose ◽  
Dose Range ◽  
Fiber Bragg Gratings ◽  
Bragg Gratings ◽  
Detector Response ◽  
High Dose ◽  
Polyether Ether Ketone ◽  
Silica Fibers ◽  
Simple Physical Model ◽  
Radiotherapy Dosimetry

Fiber Bragg gratings (FBGs) are valuable dosimeters for doses up to 100 kilograys (kGy), but have hardly been used for the low-dose range of a few grays (Gy) required in medical radiation dosimetry. We report that embedding a doped silica fiber FBG in a polymer material allows a minimum detectable dose of 0.3 Gy for γ-radiation. Comparing the detector response for different doped silica fibers with various core doping, we obtain an independent response, in opposition to what is reported for high-dose range. We hypothesized that the sensor detection is based on the radio-induced thermal expansion of the surrounding polymer. Hence, we used a simple physical model based on the thermal and mechanical properties of the surrounding polymer and obtained good accordance between measured and calculated values for different compositions and thicknesses. We report that over the 4 embedding polymers tested, polyether ether ketone and polypropylene have respectively the lowest (0.056 pm/Gy) and largest sensitivity (0.087 pm/Gy). Such FBG-based dosimeters have the potential to be distributed along the fiber to allow multipoint detection while having a sub-millimeter size that could prove very useful for low-dose applications, in particular for radiotherapy dosimetry.

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