Abstract
The sensing characteristics of irradiated fiber Bragg gratings (FBGs) and Fabry-Perot interferometers (FPIs) were investigated under a 2 MGy dose of gamma radiation. The study found that the pressure sensitivity of FP sensors after irradiation was stable, while the temperature sensitivity of FBG sensors was unstable, and both wavelengths displayed a shift. These findings offer the possibility for the application of FP pressure sensors in the gamma radiation environments, and FBG sensors require further research to be suitable for application in the nuclear radiation environments.
Highlights
Optical fiber sensors have drawn much attention due to their advantages under exposure to nuclear radiation, such as compact size, high sensitivity, wavelength multiplexing, and anti-electromagnetic interference [1,2,3].Since the 1990s, researchers have been exploring the use of fiber Bragg gratings (FBGs) in radiation environments [4,5,6]
To improve the radiation resistance of FBGs, researchers have found that FBGs written on pure-silica-core fiber, nitrogen-doped fiber, and phosphorus-doped fiber have better radiation resistance than those written on ordinary single-mode fibers (SMF) [8,9,10]
Radiation had no effect on full width at half maxima (FWHM), which was 0.4 nm before irradiation, at a 1 MGy dose and a 2 MGy dose
Summary
Optical fiber sensors have drawn much attention due to their advantages under exposure to nuclear radiation, such as compact size, high sensitivity, wavelength multiplexing, and anti-electromagnetic interference [1,2,3]. Since the 1990s, researchers have been exploring the use of fiber Bragg gratings (FBGs) in radiation environments [4,5,6]. Radiation induced Bragg wavelength shift (RI-BWS) and radiation induced attenuation (RIA) were investigated by Remy et al. RI-BWS ranged from 20 pm to 700 pm with radiation doses ranging from 100 kGy to 3.8 GGy. It was found that the RI-BWS is related to fiber doping, the FBG fabrication process, and radiation temperature. Ten times of the RI-BWS variation was observed
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