Abstract
A high-sensitivity, low-cost, ultrathin, hollow fiber micro bubble structure was proposed; such a bubble can be used to develop a high-sensitivity strain sensor based on a Fabry–Perot interferometer (FPI). The micro bubble is fabricated at the fiber tip by splicing a glass tube to a single mode fiber (SMF) and then the glass tube is filled with gas in order to expand and form a micro bubble. The sensitivity of the strain sensor with a cavity length of about 155 μm and a bubble wall thickness of about 6 μm was measured to be up to 8.14 pm/με.
Highlights
The micro fiber Fabry–Perot interferometer (FPI) sensor with the advantages of compact structure [1], anti-electromagnetic interference [2], and high sensitivity [3] has taken the leading role in a large number of sensing applications such as strain, high sensitive temperature, high sensitive pressure and so on [4,5,6]
In view of the above situation, this paper demonstrates an improved simple encapsulation method for the preparation of a high-sensitivity, low-cost, ultrathin, hollow fiber micro bubble structure, which is realized by the method of multiple weak discharges and slow release pressure at the end of the optical fiber
Schematic diagrams of the fabrication process of in-fiber FPI based on an air bubble. (a) single mode fiber (SMF)
Summary
Lu Yan 1,2 , Zhiguo Gui 1 , Guanjun Wang 1,2, *, Yongquan An 1,2, *, Jinyu Gu 1,2 , Meiqin Zhang 1,2 , Xinglin Liu 1,2 , Zhibin Wang 1,2 , Gao Wang 1 and Pinggang Jia 3. Engineering Technology Research Center of Shanxi Province for Opto-electric Information and Instrument, Taiyuan 030051, China
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