26-039 Optical fiber sensor for depressurization measurement in space

Mission

This thesis addresses the critical requirement for pressure monitoring in proximity to sensitive instrumentation within confined space environments. The study specifically targets the challenges posed by high-orbit conditions, including elevated radiation exposure, to accurately characterize and evaluate degassing phenomena. This measurement is particularly critical given the influence of out gassing on the pressurization of satellite cavities, the associated risks, and the design constraints and operational procedures (such as decontamination and startup procedure) of satellites. Currently, there are no solutions to address this measurement.

This subject was study during a R&T project involving the Contamination Department (D. Faye) and FEMTO-ST (J.-C. Beugnot). We also demonstrate an optical fiber Pirani gauge sensor. During this project, the design of the sensor was optimized for space applications. It has shown that a 25 mm long thinned optic...