Effect of Low-Doses of Gamma Radiation on Electric Arc-Induced Long Period Fiber Gratings

Mesonero-Santos, Patricia; Fernández-Medina, Ana; Coelho, L.; Viveiros, Duarte; Jorge, P. A. S.; Belenguer, T.; Heredero, R. L.

doi:10.3390/s21072318

Cited by 6 publications

(4 citation statements)

References 30 publications

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“…The temperature-corrected dip wavelengths of the transmission spectrum of the coated LPFG-EAD with the pH value changing from 2 to 8 is shown in Figure 5 during a complete cycle of increasing and decreasing pH values, in this order. This kind of LPFG was irradiated before with up to 200 krad gamma radiation showing that the radiation-induced wavelength shift is nearly disappeared after 4000 h [6].…”

Section: Resultsmentioning

confidence: 99%

Fiber optic pH sensors for in-situ planetary exploration

Mesonero Santos,

López Heredero,

Belenguer

2024

Specialty Optical Fibres VIII

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The main goal of planetary exploration missions is the search for life and the study of the habitability. For this purpose, the development of instrumentation that can analyze parameters as pH, which is an indicator that provides astrobiological information, is of great interest.The study is carried out with two kind of fiber optic sensors to demonstrate the feasibility for planetary exploration since they are sensitive to the surrounding refractive index: Long Period Fiber Gratings (LPFG) fabricated with two different methods and Tilted Fiber Bragg Gratings (TFBG).In order to develop a fiber optic pH sensor, a polyvinyl alcohol (PVA)/polyacrylic Acid (PAA) hydrogel film (~ 2 μm thickness) has been deposited on the gratings and the first measurements have been performed. The refractive index of the polymer changes depending on the pH value, and this change is measured by monitoring the Dip Wavelength Shift (DWS) and the transmission power.The experimental results obtained with the coated fiber optic sensors in a range from pH2 to pH8 show that the LPFGs have a higher sensitivity in terms of nm/pH than the TFBG as expected. It was observed that the longer the grating length of the sensors, the greater the hysteresis.The aim of the future work is to submit the pH sensors to an ionizing radiation test to verify that the polymer does not suffer degradation in a harsh environment similar to the one encountered in future in-situ explorations for astrobiology studies.

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Section: Resultsmentioning

confidence: 99%

Fiber optic pH sensors for in-situ planetary exploration

Mesonero Santos,

López Heredero,

Belenguer

2024

Specialty Optical Fibres VIII

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“…We also developed our own setup for polishing the electrodes after normal degradation caused by the arc discharges [ 102 ]. It should be highlighted that the final experimental setup shown in Figure 2 d), where the high voltage is instead supplied by the BICC fusion splicer, has been used by dozens of students in their final BSc projects and MSc/PhD thesis as well as by researchers worldwide, resulting in more than two hundred published papers [ 86 , 104 , 105 , 106 , 107 , 108 , 109 , 110 , 111 , 112 ]. The only drawback of this infrastructure is the limitation in the minimum grating period to be used, of about 385 μm in standard fibers (240 μm in a nitrogen doped fiber [ 82 ]).…”

Section: Fabrication and Characterization Of Long-period Fiber Gratingsmentioning

confidence: 99%

Arc-Induced Long-Period Fiber Gratings at INESC TEC. Part I: Fabrication, Characterization and Mechanisms of Formation

Rego

Caldas

Иванов

2021

Sensors

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In this work, we reviewed the most important achievements of INESC TEC related to the fabrication of long-period fiber gratings using the electric arc technique. We focused on the fabrication setup, the type of fiber used, and the effect of the fabrication parameters on the gratings’ transmission spectra. The theory was presented, as well as a discussion on the mechanisms responsible for the formation of the gratings, supported by the measurement of the temperature reached by the fiber during an electric arc discharge.

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“…Recently, there is an increasing interest for this topic, since gratings arc-induced in non-radiation-resistant fibers can be used as radiation dosimeters [ 153 , 154 , 155 , 156 , 157 ].…”

Section: Lpfgs’ Sensitivity To Fabrication and Physical Parametersmentioning

confidence: 99%

Arc-Induced Long-Period Fiber Gratings at INESC TEC. Part II: Properties and Applications in Optical Communications and Sensing

Rego

Caldas

Иванов

2021

Sensors

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In this work, we review the most important achievements of INESC TEC related to the properties and applications of arc-induced long-period fiber gratings. The polarization dependence loss, the spectral behavior at temperatures ranging from cryogenic up to 1200 °C and under exposure to ultraviolet and gamma radiation is described. The dependence of gratings sensitivity on the fabrication parameters is discussed. Several applications in optical communications and sensing domains are referred.

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Effect of Low-Doses of Gamma Radiation on Electric Arc-Induced Long Period Fiber Gratings

Cited by 6 publications

References 30 publications

Fiber optic pH sensors for in-situ planetary exploration

Fiber optic pH sensors for in-situ planetary exploration

Arc-Induced Long-Period Fiber Gratings at INESC TEC. Part I: Fabrication, Characterization and Mechanisms of Formation

Arc-Induced Long-Period Fiber Gratings at INESC TEC. Part II: Properties and Applications in Optical Communications and Sensing

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