Examinando por Autor "Coelho, L. C. C."

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Effect of Low-Doses of Gamma Radiation on Electric Arc-Induced Long Period Fiber Gratings
(Multidisciplinary Digital Publishing Institute (MDPI), 2021-03-26) Mesonero Santos, P.; Fernández Medina, A.; Coelho, L. C. C.; Viveiros, D.; Jorge, P. A.; Belenguer, T.; López Heredero, R.; Mesonero Santos, P. [0000-0002-6088-5731]; Fernández Medina, A. [0000-0002-1232-4315]; Coelho, L. C. C. [0000-0001-6205-9479]; Jorge, P. A. [0000-0003-1484-2068]; López Heredero, R. [0000-0002-2197-8388]
This work presents an experimental study on the effects of gamma radiation on Long Period Fiber Gratings (LPFGs) in a low-dose test campaign to evaluate their eventual degradation. The study was carried out with standard single-mode fibers where the grating was inscribed using the Electric-Arc Discharge (EAD) technique. Before the gamma campaign, a detailed optical characterization was performed with repeatability tests to verify the accuracy of the setup and the associated error sources. The gamma-induced changes up to a dose of 200 krad and the recovery after radiation were monitored with the Dip Wavelength Shift (DWS). The results show that the gamma sensitivity for a total dose of 200 krad is 11 pm/krad and a total DWS of 2.3 nm has been observed with no linear dependence. Post-radiation study shows that recovery from radiation-induced wavelength shift is nearly complete in about 4000 h. Experimental results show that the changes suffered under gamma irradiation of these LPFGs are temporary making them a good choice as sensors in space applications.