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Sensors 2017, 17(6), 1282; doi:10.3390/s17061282

Optimal Design of an Hourglass in-Fiber Air Fabry-Perot Microcavity—Towards Spectral Characteristics and Strain Sensing Technology

1
College of Information Science and Engineering, Northeastern University, Shenyang 110819, China
2
State Key Laboratory of Synthetical Automation for Process Industries (Northeastern University), Shenyang 110819, China
*
Author to whom correspondence should be addressed.
Academic Editor: Vittorio M. N. Passaro
Received: 16 February 2017 / Revised: 16 May 2017 / Accepted: 16 May 2017 / Published: 4 June 2017
(This article belongs to the Section Physical Sensors)
View Full-Text   |   Download PDF [5129 KB, uploaded 4 June 2017]   |  

Abstract

An hourglass in-fiber air microcavity Fabry-Perot interferometer is proposed in this paper, and its second reflecting surface of in-fiber microcavity is designed to be a concave reflector with the best curvature radius in order to improve the spectral characteristics. Experimental results proved that the extinction ratio of Fabry-Perot interferometer with cavity length of 60 μm and concave reflector radius of 60 μm is higher than for a rectangular Fabry-Perot interferometer with cavity length of 60 μm (14 dB: 11 dB). Theory and numerical simulation results show that the strain sensitivity of sensor can be improved by reducing the microcavity wall thickness and microcavity diameter, and when the in-fiber microcavity length is 40 μm, the microcavity wall thickness is 10 μm, the microcavity diameter is 20 μm, and the curvature radius of reflective surface II is 50 μm, the interference fringe contrast of is greater than 0.97, an Axial-pull sensitivity of 20.46 nm/N and resolution of 1 mN can be achieved in the range of 0–1 N axial tension. The results show that the performance of hourglass in-fiber microcavity interferometer is far superior to that of the traditional Fabry-Perot interferometer. View Full-Text
Keywords: fiber Fabry-Perot interferometer; in-fiber air microcavity; spectral characteristics; strain; high fringe contrast; high resolution fiber Fabry-Perot interferometer; in-fiber air microcavity; spectral characteristics; strain; high fringe contrast; high resolution
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Wang, Q.; Yan, D.; Cui, B.; Guo, Z. Optimal Design of an Hourglass in-Fiber Air Fabry-Perot Microcavity—Towards Spectral Characteristics and Strain Sensing Technology. Sensors 2017, 17, 1282.

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