Anisotropic Fiber Bragg Gratings Inscribed by High-Intensity Femtosecond-UV Pulses: Manufacturing Technology and Strain Characterization for Sensing Applications

O'Byrne, Ronan; Sergeyev, Sergey; Flavin, Donal A.; Slattery, Stephen A.; Nikogosyan, David N.; Jones, Julian D. C.

doi:10.1109/jsen.2008.926919

Cited by 5 publications

(2 citation statements)

References 31 publications

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“…At the end, another spherical mirror focuses the diffracted light onto a one-dimensional linear detector array. More detailed descriptions of the Czerny-Turner Design can be found in [32][33][34]. This measurement approach differs from previous setups mainly in the size of the field of view and the processing of the measurement data.…”

Section: Measurement Approachmentioning

confidence: 99%

Theoretical-Numerical Investigation of a New Approach to Reconstruct the Temperature Field in PBF-LB/M Using Multispectral Process Monitoring

May,

Werz

2024

JMMP

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The monitoring of additive manufacturing processes such as powder bed fusion enables the detection of several process quantities important to the quality of the built part. In this context, radiation-based monitoring techniques have been used to obtain information about the melt pool and the general temperature distribution on the surface of the powder bed. High temporal and spatial resolution have been achieved at the cost of large storage requirements. This contribution aims to offer an alternative strategy of gaining information about the powder bed’s temperature field with sufficient resolution but with an economical amount of data. The investigated measurement setup uses a spectrometer to detect the spectral radiation intensities emitted by an area enclosing the melt pool and part of its surroundings. An analytical description of this process is presented, which shows that the measured spectral entities can be reconstructed by the Ritz method. It is also shown that the corresponding weighting factors can be physically interpreted as subdomains of constant temperature within the measurement area. Two different test cases are numerically analyzed, showing that the methodology allows for an approximation of the melt pool size while further assumptions remain necessary to reconstruct the actual temperature distribution.

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Section: Measurement Approachmentioning

confidence: 99%

Theoretical-Numerical Investigation of a New Approach to Reconstruct the Temperature Field in PBF-LB/M Using Multispectral Process Monitoring

May,

Werz

2024

JMMP

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“…FBG is a periodic refractive index modulation along the optical fiber, which can be fabricated by exposing the fiber to an intense periodic optical laser. Generally, FBGs are created in photo-sensitive glass using ultraviolet laser, in which case, hydrogen loading is preferred for enhanced photosensitivity, since pure silica is non-photosensitive [16,17]. This inconvenience is challenging to realizing a complex grating structure as well as to expand the practical functions.…”

Section: Introductionmentioning

confidence: 99%

A Temperature Fiber Sensor Based on Tapered Fiber Bragg Grating Fabricated by Femtosecond Laser

et al. 2018

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A temperature fiber sensor based on tapered fiber Bragg grating (tapered FBG) fabricated by femtosecond laser has been proposed and realized with good reproducibility. Firstly, the fiber taper with 25 μm diameter and 1000 μm length is fabricated by arc-discharge elongation using two standard single-mode fibers. Secondly, two first-order FBGs are fabricated in tapered and non-tapered fiber regions for comparison. Both FBGs are point-by-point direct-written by femtosecond laser, and the grating lengths are 1000 μm. Thirdly, a temperature experiment is performed using a heating chamber, and experimental results show that in the range of 30~350 °C, the temperature sensitivity of the tapered FBG has increased from 11.0 pm/°C to 12.3 pm/°C. The tapered FBG proposed here can be further configured for sensing other parameters in physical, chemical, and biomedical applications.

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Temperature and refractive index measurement using an optical fiber sensor featuring PCF-FP and FBG inscribed by femtosecond laser

Wen

Tuerdahong

Zhu

et al. 2019

Optik

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Anisotropic Fiber Bragg Gratings Inscribed by High-Intensity Femtosecond-UV Pulses: Manufacturing Technology and Strain Characterization for Sensing Applications

Cited by 5 publications

References 31 publications

Theoretical-Numerical Investigation of a New Approach to Reconstruct the Temperature Field in PBF-LB/M Using Multispectral Process Monitoring

Theoretical-Numerical Investigation of a New Approach to Reconstruct the Temperature Field in PBF-LB/M Using Multispectral Process Monitoring

A Temperature Fiber Sensor Based on Tapered Fiber Bragg Grating Fabricated by Femtosecond Laser

Temperature and refractive index measurement using an optical fiber sensor featuring PCF-FP and FBG inscribed by femtosecond laser

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