Abstract
Brillouin optical time domain analysis (BOTDA) has been widely applied in a great many of fields, as an effective approach of performing distributed temperature and strain measurement. Among these fields, aerospace is a major aspect where BOTDA is expected to play a significant role. However, the performance and stability of sensing fiber in cold-black background with ultra-low temperature is unknown and rather worthy of investigation. It is of great importance to figure out whether the sensing fiber is able to survive the ultra-low temperature, whether the Brillouin spectrum would appear in the same way as it does in room temperature, whether it maintains any sensitivity to strain and temperature and so forth. To make these issues clear, this paper performs a comprehensive experimental investigation and several useful conclusion has been obtained.
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