Browsing by Author "Allwood, G"

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    Gamma irradiation response in photonic crystal and standard optical fiber Bragg grating sensors for radiation dosimetry
    (Society of Photo-Optical Instrumentation Engineers, 2019-12-30) Baccini, D; Hinckley, S; Canning, J; Allwood, G; Cook, K; Wild, G; Davies, JB; Banos, C
    In this paper, we report the response of Cobalt-60 gamma irradiation on Photonic Crystal Fibre Bragg gratings (PCFFBGs) and standard commercial FBGs (STD-FBGs). Optical measurements were performed to determine the shift of the Bragg wavelength as a function of accumulated dose and relaxation time. To simulate real time conditions of a radiation dosimeter, the FBGs are examined through three consecutive radiation stages followed by very limited recovery times. We were able to obtain a Bragg wavelength shift with both sets of FBGs. The PCF-FBGs response included strong recovery after each irradiation compared to the STD-FBGs. This makes the PCF-FBGs strong candidates as optical fibre FBG sensors in the area of radiation dosimetry. © (2019) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE).