POF vibration sensor based on speckle pattern changes
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AuthorRodríguez Cobo, Luis; Lomer Barboza, Mauro Matías; Galíndez Jamioy, Carlos Augusto; López Higuera, José Miguel
© 2012 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, 2012, vol. 8421, 84212Y
22nd International Conference on Optical Fiber Sensors, Pekín, 2012
SPIE Society of Photo-Optical Instrumentation Engineers
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Multimode fiber sensing
A method of sensing vibration using detection of changes in the spatial distribution of energy on the speckle pattern in the output multimode optical fiber is presented and demonstrated. The implementation of sensor consists of a small length of fiber which is isolated and sensitive to ambient vibration. The projection of the speckle pattern is directly recorded by a CCD camera at the outlet end of the fiber and processed changes in the intensity distribution. The sensor is simple, inexpensive and can be implemented to measure vibrations in engine, machines or buildings.