A miniature fiber-optic refractive-index sensor based on laser-machined Fabry-Perot interferometer tip

Zengling Ran; Yunjiang Rao; Jian Zhang; Bing Xu

doi:10.1117/12.835314

5 October 2009 A miniature fiber-optic refractive-index sensor based on laser-machined Fabry-Perot interferometer tip

Zengling Ran, Yunjiang Rao, Jian Zhang, Bing Xu

Proceedings Volume 7503, 20th International Conference on Optical Fibre Sensors; 75035U (2009) https://doi.org/10.1117/12.835314
Event: 20th International Conference on Optical Fibre Sensors, 2009, Edinburgh, United Kingdom

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.

Citation Download Citation

Zengling Ran, Yunjiang Rao, Jian Zhang, and Bing Xu "A miniature fiber-optic refractive-index sensor based on laser-machined Fabry-Perot interferometer tip", Proc. SPIE 7503, 20th International Conference on Optical Fibre Sensors, 75035U (5 October 2009); https://doi.org/10.1117/12.835314

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