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Proceedings Paper

Laser-micromachined Fabry-Perot fiber-optic tip sensor for temperature-independent measurement of refractive index
Author(s): Zeng-Ling Ran; Yun-Jiang Rao; Wei-Jun Liu; Xian Liao; Kin-Seng Chiang
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Paper Abstract

We propose and demonstrate a Fabry-Perot fiber-optic tip sensor for high-resolution refractive-index measurement. The sensor head consists of a short air cavity produced near the tip of a single-mode fiber by 157-nm laser micromachining. The external refractive index is determined from the maximum visibility of the interference fringes in the reflection spectrum of the fiber. This sensor provides temperature-independent measurement of practically any refractive index larger than that of air and offers a refractive-index resolution of ~4×10-5 in its linear operating range. The experimental data agree well with the theoretical results.

Paper Details

Date Published: 16 May 2008
PDF: 4 pages
Proc. SPIE 7004, 19th International Conference on Optical Fibre Sensors, 70041H (16 May 2008); doi: 10.1117/12.785755
Show Author Affiliations
Zeng-Ling Ran, Univ. of Electronic Science & Technology of China (China)
Yun-Jiang Rao, Univ. of Electronic Science & Technology of China (China)
Wei-Jun Liu, Univ. of Electronic Science & Technology of China (China)
Xian Liao, Univ. of Electronic Science & Technology of China (China)
Kin-Seng Chiang, Univ. of Electronic Science & Technology of China (China)
City Univ. of Hong Kong (Hong Kong China)


Published in SPIE Proceedings Vol. 7004:
19th International Conference on Optical Fibre Sensors
David Sampson; Stephen Collins; Kyunghwan Oh; Ryozo Yamauchi, Editor(s)

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