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Fabrication process of the fiber pressure sensor. (a) Splice a glass tube to a single-mode fiber; (b) The diameter and thickness of the glass tube become thinner by tuning the parameters of fusion and filling pressure; (c) Heat and melt the glass tube to form a single-ended hollow conical structure; (d) A sketch showing the fiber-tip microbubble; (e) The single-mode fiber and microbubble were sealed together; (f) A sketch showing the final fiber-tip micro-bubble sensor.
