Measurement of displacement in the micrometer range using speckle pattern correlation in multimode fibers
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AuthorLomer Barboza, Mauro Matías; Abascal Santamaría, Jesús Ramón; Castrellón Uribe, Jesús; López Higuera, José Miguel
© 2013 Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic electronic or print reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.
Proceedings of SPIE, 2013, vol. 8794, 879445
Fifth European Workshop on Optical Fibre Sensors, Cracovia, 2013
SPIE Society of Photo-Optical Instrumentation Engineers
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Plastic optical fiber
The displacement measurement in the micrometer range using the speckle pattern correlation in optical fibers is described. The high sensitivity of a multimode fiber when propagating a coherent light causes any variation in the distribution of the speckle pattern is proportional to the disturbance which it originates. The speckle pattern is caused by interference between modes and the shift mechanism is due to coupling between modes and micro-induced redistribution curvature applied to the fiber externally. The movement is produced by a transducer containing microbends pressure induced on the fiber. Experimental results are presented using three types of multimode plastic optical fiber. In the signal generated from the change in the speckle pattern observed with relatively good reproducibility, so that sensor systems could be used.