13. Fibre sensor injection system for capillary tubes
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Abstract: As part of the demonstration aspects of the SOMOS project, temperature and radiation sensing were planned using dedicated stainless steel tubes engineered and emplaced within the CORALUS tests in the HADES underground research laboratory in Belgium. Though the placement of optical fibres in capillary tubes is a mature technology in telecommunication systems, the particular set-up used is far more demanding.
Mainly the fact that the capillary tubes were placed with several loops around the CORALUS test tubes imposed a lot more friction during emplacement. The (fragile) optical fibres used for radiation sensing proved to be impossible to inject fully given the local geometry of the CORALUS experiment. However, the carbon-reinforced Tower grating fibres for temperature sensing were successfully placed and benchmarked against the available classical temperature sensors.