Highly sensitive optical fiber bending sensor based on hollow core fiber and single mode fiber

We demonstrate a highly sensitive Fabry–Perot interferometer bending sensor based on vernier effect. The sensor device consists of two cascaded fabry-Perot cavities, one is an air-cavity formed by a section of hollow core fiber spliced with single-mode fiber, and the other is formed by two mirrors w...

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Bibliographic Details
Published in:Optik (Stuttgart) 2021-02, Vol.228, p.166209, Article 166209
Main Authors: Niu, Y.D., Chen, Q., Zhao, Chunliu, Wang, D.N.
Format: Article
Language:English
Subjects:
Fabry–Perot interferometers
Hollow core fiber
Vernier effect
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Summary:We demonstrate a highly sensitive Fabry–Perot interferometer bending sensor based on vernier effect. The sensor device consists of two cascaded fabry-Perot cavities, one is an air-cavity formed by a section of hollow core fiber spliced with single-mode fiber, and the other is formed by two mirrors written in single-mode fiber by femtosecond laser. By accurately controlling the cavity length of the Fabry–Perot interferometer in single mode fiber, achieved by using femtosecond laser micromachining platform, a large and controllable amplification factor can be obtained. The bending sensitivity of our device is ∼52.877 nm/m−1. Such a device is simple in structure, easy in fabrication and stable in operation.
ISSN:0030-4026
1618-1336
DOI:10.1016/j.ijleo.2020.166209