Numerical Analysis of Radiation Effects on Fiber Optic Sensors

Rana, Sohel; Subbaraman, Harish; Fleming, Austin; Kandadai, Nirmala

doi:10.3390/s21124111

Cited by 3 publications

(2 citation statements)

References 43 publications

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“…The optical fibers play a very important role in the telecommunication and sensing fields being used in diverse applications. In the recent years researchers have demonstrated that the gamma-rays and/or X/UV radiation changed the optical properties and have induced radiation attenuation in the optical fibers [12,13,14] . The effects of high frequency radiation interacting with the detecting optical fibers were analyzed by recording transmitted spectra before and after irradiation.…”

Section: Introductionmentioning

confidence: 99%

Third harmonics emission with nanosecond and femtosecond lasers in air: gamma radiation effects on optical fibers

Stafe

Vasile²,

Mihalcea³

et al. 2023

Advanced Topics in Optoelectronics, Microelectronics, and Nanotechnologies XI

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Harmonics generation in plasma by high-power pulsed lasers is an important task for plasma diagnosis. This is because of the strong relationship between the plasma characteristics and the properties of the harmonics radiation. Here we analyze the spatial and temporal properties of third harmonic (TH) radiation generated by focusing ns and fs laser pulses in air at intensities of the order of tens of TW/cm2. The air is considered a non-dispersive non-linear (NL) medium due to the low density ofN2 ions in the breakdown plasma produced under the laser pulses. We address the influence of the pump laser intensity on the properties of TH radiation. We find theoretically and experimentally that the intensity of TH radiation at the output of the NL medium increases linearly with third power of the pump peak intensity, both for ns and fs laser pulses. In case of fs pulses, we demonstrate that TH pulse duration decreases with pump intensity, in correlation to the air breakdown plasma properties. In case of ns laser pulses, we demonstrate that the TH beam diameter is two times smaller than the fundamental’s. The theoretical results on the dependence of the TH signal to the driving peak intensity are supported by experimental data. We further analyze the influence of the gamma radiation on the several commercially optical fibers that are usually employed in the laser-target interaction area. The radiation effects such as photo-darkening induced in optical fibers can severely decrease the performance of optical transmission. We investigated the change of optical transmission induced by gamma-ray radiation. Multimode optical fibers, with a core diameter of 200 μm (usable in UV, ultra-highvacuum and high temperatures conditions), were investigated in order to evaluate their possible use for diagnosis of plasmas produced by high power lasers. The optical properties were studied by analyzing the transmitted spectra of the fibers before and after irradiation, demonstrating a decrease of the measured spectrum of the optical fiber output when increasing gamma dose to 16 kGy. The results are important from both fundamental and practical points of view, providing an efficient tool for prediction of the non-linear optical phenomena in laser produced plasmas and for non-contact diagnosis of the harmonics-generating plasmas.

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Section: Introductionmentioning

confidence: 99%

Third harmonics emission with nanosecond and femtosecond lasers in air: gamma radiation effects on optical fibers

Stafe

Vasile²,

Mihalcea³

et al. 2023

Advanced Topics in Optoelectronics, Microelectronics, and Nanotechnologies XI

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show abstract

“…So far, radiation-induced compaction has been calculated using power law [3] and empirical equation [1]. Then, Lorentz-Lorenz relationship, point dipole theory, sensitivity factor, and a few empirical equations have been utilized to find out the change in RI and linear compaction from the volume compaction [3,9,44,[46][47][48]. An immediate question arises on whether these methods (Lorentz-Lorenz, point dipole theory) consider the combined RIC, RIA and dopant diffusion effects on the RI change or only consider the RIC effects on the RI change.…”

Section: Introductionmentioning

confidence: 99%

Active Compensation of Radiation Effects on Optical Fibers for Sensing Applications

Rana

Fleming

Kandadai

et al. 2021

Sensors

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Neutron and gamma irradiation is known to compact silica, resulting in macroscopic changes in refractive index (RI) and geometric structure. The change in RI and linear compaction in a radiation environment is caused by three well-known mechanisms: (i) radiation-induced attenuation (RIA), (ii) radiation-induced compaction (RIC), and (iii) radiation-induced emission (RIE). These macroscopic changes induce errors in monitoring physical parameters such as temperature, pressure, and strain in optical fiber-based sensors, which limit their application in radiation environments. We present a cascaded Fabry–Perot interferometer (FPI) technique to measure macroscopic properties, such as radiation-induced change in RI and length compaction in real time to actively account for sensor drift. The proposed cascaded FPI consists of two cavities: the first cavity is an air cavity, and the second is a silica cavity. The length compaction from the air cavity is used to deduce the RI change within the silica cavity. We utilize fast Fourier transform (FFT) algorithm and two bandpass filters for the signal extraction of each cavity. Inclusion of such a simple cascaded FPI structure will enable accurate determination of physical parameters under the test.

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An experimental device for measuring the internal temperature and pressure of rock for rock breaking by pulsed discharge in petroleum exploitation

Bai

Liu²,

Zhang³

et al. 2022

Energy Reports

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Numerical Analysis of Radiation Effects on Fiber Optic Sensors

Cited by 3 publications

References 43 publications

Third harmonics emission with nanosecond and femtosecond lasers in air: gamma radiation effects on optical fibers

Third harmonics emission with nanosecond and femtosecond lasers in air: gamma radiation effects on optical fibers

Active Compensation of Radiation Effects on Optical Fibers for Sensing Applications

An experimental device for measuring the internal temperature and pressure of rock for rock breaking by pulsed discharge in petroleum exploitation

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