Mesonero Santos, P.Fernández Medina, A.Coelho, L. C. C.Viveiros, D.Jorge, P. A.Belenguer, T.López Heredero, R.2022-02-152022-02-152021-03-26Sensors 21(7): 2318(2021)https://www.mdpi.com/1424-8220/21/7/2318http://hdl.handle.net/20.500.12666/592This 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.engAttribution-NonCommercial-NoDerivatives 4.0 Internationalhttps://creativecommons.org/licenses/by-nc-nd/4.0/Gamma irradiationElectric arc discharge (EAD)Long period fiber grating (LPFG)Relaxationinfo:eu-repo/semantics/article10.3390/s210723181424-8220info:eu-repo/semantics/openAccess