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Open AccessArticle

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

1
Physics Department, Northwest University, No.229, Taibai Road (North), Xi’an 710069, China
2
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; https://doi.org/10.3390/s16010092
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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MDPI and ACS Style

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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