Transient and steady state radiation responses of solarization-resistant optical fibers

Girard, Éric; Marcandella,

doi:10.1109/radecs.2009.5994716

Cited by 5 publications

(2 citation statements)

References 25 publications

(35 reference statements)

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“…Thus, given its spectral features, the presence of tryptophan can be evaluated and estimated upon monitoring the fluorescence emission in the UV spectral range 6,9 . within this wavelength region 14 . Although these waveguides are readily available, these are in general more expensive than conventional optical fibers, and this has also an impact in the cost of the devices (e.g., bundles or fibers optic probes) for monitoring of UV autofluorescence signals.…”

Section: Introductionmentioning

confidence: 88%

Polymer coatings with rare-earth activated phosphors for optical fiber fluorosensors

Carrillo-Betancourt

Hernández‐Cordero

2022

Nanoengineering: Fabrication, Properties, Optics, Thin Films, and Devices XIX

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Tryptophan fluorescence offers a means for tracking cellular proliferation in events such as wounds closure, neoplasm and others chronic conditions. The peak fluorescence emission is located around 345 nm (UV range) and is typically analyzed through spectroscopic measurements. In general, optical fibers show poor transmission in this wavelength range, and this hinders the use of this waveguides for tryptophan fluorescence monitoring or other molecule with UV fluorescence. However, down conversion phosphors attached to conventional fiber tips may provide a mechanism for improved fluorescence detection in this spectral range. In this work, we explore the use of UV-sensitive phosphors hosted by a polymer matrix that can be incorporated on the tip of conventional optical fibers for UV-fluorescence monitoring. In particular, we evaluate the performance of Eu-activated phosphors absorbing at 345 nm and emitting multiple fluorescence peaks in the 450-650 nm range. The phosphors are incorporated in polydimethylsiloxane (PDMS) by a simple mixing procedure, yielding a UV-sensitive polymer composite. Membranes of this composited were fabricated using different concentrations of the phosphors (i.e. 0.1, 0.5, 2.5, 12.5 and 62.5% wt./wt.), and their optical and thermal properties were evaluated. The polymer composites show good thermal stability and can be incorporated on conventional optical fibers. The resulting fiber optic fluorosensors may serve as a tool for fluorescence monitoring of tryptophan or other UV emitters.

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Section: Introductionmentioning

confidence: 88%

Polymer coatings with rare-earth activated phosphors for optical fiber fluorosensors

Carrillo-Betancourt

Hernández‐Cordero

2022

Nanoengineering: Fabrication, Properties, Optics, Thin Films, and Devices XIX

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“…Attempts were made to reformulate the problem and to use these effects as a measure of the dose rate/total dose of the radiation to which the optical fiber is exposed [4,8]. A special situation appears in the case of multimode optical fibers projected for UV-visible transmission, when the degradation of the optical transmission is more evident [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of UV Optical Fibers Behavior under Neutron Irradiation

Sporea¹,

Sporea²,

Ancuta³

et al. 2012

AMPC

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Degradation of UV transmitting optical fibers under nuclear reactor neutron exposure is reported. Four type of optical fibers (solarization resistant, H 2-loaded; UV transmission standard OH; UV enhanced transmission, high OH, H 2-loaded; high OH, deep UV enhanced) were exposed to neutron fluences up to 4 x 10 17 n/cm 2. The optical transmission was measured off-line over the 200 nm-900 nm spectral range and the build-up of color centers was monitored.

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Arc-induced Long Period Gratings in standard and speciality optical fibers under mixed neutron-gamma irradiation

Stăncălie

Esposito

Ranjan

et al. 2017

Sci Rep

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In this paper, for the first time, the effects of mixed neutron and gamma flux on the spectral and sensing responses of Long Period Gratings (LPGs) are thoroughly analyzed. Six LPGs written by means of Electric Arc Discharge (EAD) technique in standard and speciality fibers, including radiation-hardened ones, were tested. The EAD technique was chosen because it enables the writing of gratings both in standard and not photosensitive fibers. The experiments have been carried out in a “TRIGA” pulsed nuclear reactor and the LPGs were irradiated by a gamma-ray dose-rate of 9 Gy/s and a mean 1.2∙1012 n/(cm2s) neutron flux. Real time monitoring was performed for a comparative investigation of LPGs’ response, in terms of radiation sensitivity and wavelength shift. Experiments show that LPG in a radiation-resistant fiber exhibits resonant wavelength shift higher than LPG in standard fiber. The changes of temperature sensitivity due to radiation were experimentally established by comparison of pre- and post-radiation characterization, indicating that radiation effects induce a slight increase of the temperature sensitivity, except for the LPG in pure-silica fiber. Theoretical and numerical analysis was combined with experimental data for evaluation LPGs’ parameters changes, such as refractive index and thermo-optic coefficient, after exposure to radiation.

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Transient and steady state radiation responses of solarization-resistant optical fibers

Cited by 5 publications

References 25 publications

Polymer coatings with rare-earth activated phosphors for optical fiber fluorosensors

Polymer coatings with rare-earth activated phosphors for optical fiber fluorosensors

Evaluation of UV Optical Fibers Behavior under Neutron Irradiation

Arc-induced Long Period Gratings in standard and speciality optical fibers under mixed neutron-gamma irradiation

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