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In the framework of the HOBAN collaborative project funded by KIC InnoEnergy, radiation-hardened fiber Bragg gratings (FBGs) are developed to withstand high levels of radiation dose at high temperatures for their implementation in temperature and strain sensors for nuclear facilities, accelerators or space. This paper presents Gamma radiation test results obtained at room and elevated temperature in hardened FBGs as well as in the optical fibers used for their production. It is shown that radiation-induced Bragg wavelength shift is below ±2 pm corresponding to ±0.2 °C and does not influence the sensor performance even after a total dose of 200 kGy(SiO2) and operating temperature up to 350 °C. [ABSTRACT FROM PUBLISHER]

This paper describes an experimental study of gamma radiation effects in low-density arrays of vertically aligned carbon nanotubes. These arrays are characterized by excellent anti-reflective and absorbing properties for wavelengths from UV to IR, which makes them an interesting option for stray light control in optical space applications. Gamma irradiation equivalent to an estimated surface lifetime exposition in geostationary orbit does not affect the reflectivity of the structures. First high-energy proton irradiation studies indicate that the reflectivity of the carbon nanotubes forests remains unchanged. [ABSTRACT FROM AUTHOR]

Focuses on a study that tested the Heraeus STU optical fiber through gamma irradiation. Experiments; Results; Comparison with other fibers; Conclusion.