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Open AccessArticle

A Compact Fiber Inclinometer Using a Thin-Core Fiber with Incorporated an Air-Gap Microcavity Fiber Interferometer

Physics Department, Northwest University, No.229, Taibai Road (North), Xi’an 710069, China
International Institute for Urban Systems Engineering, Southeast University, PailouFour No. Two, Nanjing 210096, China
Authors to whom correspondence should be addressed.
Academic Editor: Vittorio M. N. Passaro
Sensors 2016, 16(1), 92;
Received: 13 November 2015 / Revised: 8 January 2016 / Accepted: 8 January 2016 / Published: 12 January 2016
(This article belongs to the Section Physical Sensors)
A compact fiber-optic inclinometer is proposed and experimentally demonstrated based on a Fabry-Perot interference (FFPI). The sensing head consists of a short segment of thin-core fiber (TCF) following with a piece of hollow-core fiber (HCF). High-order cladding modes have been excited because of core diameter mismatch. A clear interference spectrum has been obtained as the consequence of interference among the reflected core modes and cladding modes. Fringe contrast of the interference spectrum is highly sensitive to fiber bending with direction independence, and good linearity has been observed during the bending range from 1° to 3° with a sensitivity of 2.71 dB/deg. View Full-Text
Keywords: Fabry-Perot interferometer; inclinometer; fringe contrast Fabry-Perot interferometer; inclinometer; fringe contrast
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Li, J.; Qiao, X.; Rong, Q.; Sun, A. A Compact Fiber Inclinometer Using a Thin-Core Fiber with Incorporated an Air-Gap Microcavity Fiber Interferometer. Sensors 2016, 16, 92.

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