Characterization and Radiation Testing of an Embedded, Distributed Fiber Dosimetry System for Space Applications

Résumé fourni par la source

A distributed dosimetry system based on phosphorus-doped optical fiber interrogated by an embedded Optical Time-Domain Reflectometer (OTDR) operated around 1610 nm is investigated for its performance, accuracy, repeatability and reliability in radiation environments corresponding to space applications. We analyzed the metrological properties of the system, showing an accuracy of ±6 % on dose measurement using the minimum pulse width, and characterized the evolution of measurement uncertainty according to the sampling length. We demonstrated the system ability to measure Total Ionizing Dose under γ- and X-rays, at four dose rates ranging from 5.8 μGy(SiO2)/s to 5038 μGy(SiO2)/s, and with doses up to 344 Gy(SiO2). Finally, the device reliability under 350 MeV and 480 MeV proton irradiation was tested. No Single-Event Latchups (SEL) have been observed up to a fluence of ∼4.2×109cm−2and the Single-Event Functional Interrupt (SEFI) cross-section was on the order of ∼10-8cm², equivalent to ∼11.5 days in low Earth Orbit.

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