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Proceedings Paper

An optical trapping based microfiber vibration sensor
Author(s): Lei Wang; Peibo Liang; Zhihai Liu; Ai Zhou; Libo Yuan
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Paper Abstract

A novel microfiber vibration sensor based on optical trapping mechanism is proposed. In the vibration sensor, a polystyrene microsphere with a diameter of 10μm is used as the mass block. The polystyrene microsphere is enclosed in a sensing cavity filled with refractive index matching liquid. The sensing cavity is composed of a quartz capillary with an inner diameter of 40μm whose two ends are inserted with two optical fibers with an outer diameter of about 40μm. The end surface of the each fiber is fabricated to be a concave tip to generate scattering and gradient forces for trapping the mass block. By adjusting light power outgoing from the two concave tips, the mass block can be suspended at center of the sensing cavity. When a vibration is applied on the sensing cavity, the location of the microsphere will change with the vibration, which results the light power from one tip collected by the other tip also varies with the vibration. The response of the vibration sensor is experimentally demonstrated at frequency range from 15Hz to 1000Hz. The vibration sensor has advantages of simple configuration, small size, light weight as well as good vibration response.

Paper Details

Date Published: 17 May 2011
PDF: 5 pages
Proc. SPIE 7753, 21st International Conference on Optical Fiber Sensors, 77530F (17 May 2011); doi: 10.1117/12.885984
Show Author Affiliations
Lei Wang, Harbin Engineering Univ. (China)
Peibo Liang, Harbin Engineering Univ. (China)
Zhihai Liu, Harbin Engineering Univ. (China)
Ai Zhou, Harbin Engineering Univ. (China)
Libo Yuan, Harbin Engineering Univ. (China)

Published in SPIE Proceedings Vol. 7753:
21st International Conference on Optical Fiber Sensors
Jacques Albert; Wojtek J. Bock, Editor(s)

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