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Proceedings Paper

Fiber-tip bubble-structure microcavity sensor
Author(s): D. Chen; S. Luo; X. Ma; X. Jiang; G. Feng; J. Yang
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Paper Abstract

A Fabry-Perot interferometer sensor based on a fiber-tip bubble-structure micro-cavity is proposed, fabricated, and demonstrated for hydrostatic pressure sensing and transverse load sensing. A segment of a well-cleaved multimode fiber with a core diameter of 62.5μm is processed with chemical etching based on a solution of HF 40% and the bubblestructure micro-cavity is fabricated by using arc discharge at the end of the processed multimode fiber. The sensor can be considered as a two-beam Fabry-Perot interferometer with one beam from the silica-air interface on the left side of the bubble and the other from the air-silica interface on the right side of the bubble. The broadband light is injected into the fiber-tip bubble-structure micro-cavity by splicing the multimode fiber with the bubble-structure micro-cavity to a 3- dB optical coupler and the reflective spectrum of the bubble-structure micro-cavity is measured by an optical spectrum analyzer. Both hydrostatic pressure sensing with a sensitivity of ~0.1 nm/MPa and transverse load sensing with sensitivity of 3.64 nm/N are experimentally demonstrated based the proposed fiber-tip bubble-structure micro-cavity sensor. The proposed sensor is demonstrated with a relative low temperature sensitivity of about 2 pm/°C. Properties of the fiber-tip bubble-structure micro-cavitys with different sizes are investigated. The sensor has the advantages of lowcost, ease of fabrication and compact size, which make it a promising candidate for hydrostatic pressure sensing or transverse load sensing in harsh environments.

Paper Details

Date Published: 11 November 2014
PDF: 7 pages
Proc. SPIE 9274, Advanced Sensor Systems and Applications VI, 927414 (11 November 2014); doi: 10.1117/12.2070465
Show Author Affiliations
D. Chen, Zhejiang Normal Univ. (China)
S. Luo, Zhejiang Normal Univ. (China)
X. Ma, Zhejiang Normal Univ. (China)
X. Jiang, Zhejiang Normal Univ. (China)
G. Feng, Hangzhou Futong Communication Technology Co., Ltd. (China)
J. Yang, Hangzhou Futong Communication Technology Co., Ltd. (China)

Published in SPIE Proceedings Vol. 9274:
Advanced Sensor Systems and Applications VI
Tiegen Liu; Shibin Jiang; Niels Neumann, Editor(s)

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