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Proceedings Paper

A miniature fiber-optic refractive-index sensor based on laser-machined Fabry-Perot interferometer tip
Author(s): Zengling Ran; Yunjiang Rao; Jian Zhang; Bing Xu
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Paper Abstract

A novel miniature fiber-optic Fabry-Perot (F-P) refractive-index (RI) sensor machined by 157nm laser is proposed. The sensor head consists of a micro air F-P cavity near the tip of a single-mode fiber with a micro channel on the fiber tip. The micro channel is used as the entrance for medium under test. Two thin films are coated at reflective interfaces of the F-P cavity as mirrors to ensure high optical contrast, respectively. A RI resolution of 1130.887nm/RI unit (RIU) is achieved by experiment. Such a sensor has a number of outstanding advantages when compared with other fiber-optic RI sensors, such as very small, rigid, high resolution, excellent linearity, wide measurement range, et al. It is anticipated that this miniature sensor could meet the requirements for practical applications and find important applications in any case where small sensor size is essential, such as in biomedical diagnostic.

Paper Details

Date Published: 5 October 2009
PDF: 4 pages
Proc. SPIE 7503, 20th International Conference on Optical Fibre Sensors, 75035U (5 October 2009); doi: 10.1117/12.835314
Show Author Affiliations
Zengling Ran, Univ. of Electronic Science & Technology (China)
Yunjiang Rao, Univ. of Electronic Science & Technology (China)
Chongqing Univ. (China)
Jian Zhang, Univ. of Electronic Science & Technology (China)
Bing Xu, Univ. of Electronic Science & Technology (China)

Published in SPIE Proceedings Vol. 7503:
20th International Conference on Optical Fibre Sensors
Julian D. C. Jones, Editor(s)

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