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Proceedings Paper

Fiber optic force and displacement sensor based on speckle detection with 0.1-nanonewton and 0.1-angstrom resolution
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Paper Abstract

A new mode of operation for a high-multimode fiber optical sensor based on the detection of modal interference (speckle sensor) is described. The main mechanism in which the sensor is based is coupling between different modes due to curvature induced upon bending of the fiber. In contrast to previous work, the variation of the length of the fiber under such curvatures may be neglected in this work. A sensor of this kind was implemented and showed a resolution of 10-11 m in displacement and 10-10 N in force. The 'spring' constant of the sensor is relatively small (5.6 N/m) compared to similar sensor. A detailed theoretical analysis of the mechanism involved in the transduction process is given. The potential use of this sensor in atomic force microscopy (AFM) is discussed.

Paper Details

Date Published: 2 March 1993
PDF: 12 pages
Proc. SPIE 1793, Integrated Optics and Microstructures, (2 March 1993); doi: 10.1117/12.141221
Show Author Affiliations
Augusto Garcia-Valenzuela, Case Western Reserve Univ. (United States)
Massood Tabib-Azar, Case Western Reserve Univ. (United States)

Published in SPIE Proceedings Vol. 1793:
Integrated Optics and Microstructures
Massood Tabib-Azar; Dennis L. Polla, Editor(s)

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