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1 International Journal of Microelectronics and Computer Science

1 2014

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Multimode polymer optical fiber strain gauge based on speckle correlation

Varyshchuk V, Bobitski Y., Poisel H.

International Journal of Microelectronics and Computer Science

2014

Vol. 5, nr 3

111--115

In this paper, we proposed an optical ﬁber strain gauge where the fiber elongation originates from a spatial change in a random intensity pattern which is measured through a correlation coefficient of two speckle image. The optical scheme and the operation principle of strain gauge based on multimode polymer optical fiber is investigated. The possibility of measuring of the relative strain by processing of speckle patterns at the exit face of multimode fiber is studied theoretically and experimentally. The algorithm of correlation processing of speckle pattern is developed too. The sensing technique presented in this paper is simple, effective and low-cost solutions to the problem of small strain monitoring. The proposed method can be used to structural health-monitoring of the elements of buildings and industrial objects.