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Deformation sensing with a multimode POF using speckle correlation processing method

Varyshchuk V., Bobitski Y., Poisel H.

Opto-Electronics Review

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2017

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Vol. 25, No. 1

19--23

EN

A deformation sensing technique with a multimode plastic optical fibre based on intensity speckle patterns’ correlation coefficient measurement has been presented. Influence of the average speckle size on results of deformation measuring has been studied and discussed. The presented sensing technique pro-vides a good linear response to the applied deformation in a relatively wide operation region. It is shown hat the proposed technique is highly sensitive, low-cost and simple to implement in practice.

2

Multimode polymer optical fiber strain gauge based on speckle correlation

Varyshchuk V, Bobitski Y., Poisel H.

International Journal of Microelectronics and Computer Science

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2014

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Vol. 5, nr 3

111--115

EN

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.

3

Optical excitation of surface plasmon polariton and waveguide modes resonances on prismatic structures

Fitio V., Yaremchuk I., Bobitski Y.

Optica Applicata

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2011

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Vol. 41, nr 4

929--939

EN

The prismatic structures for excitation surface plasmon polariton and waveguide modes resonances were investigated. The first structure consists of a glass prism and thin metallic layer deposited on the prism. The second one includes an additional dielectric layer. Plasmon polariton resonance can be observed only for TM polarization at finely tuned structure parameters. Waveguide modes resonance is possible for both polarizations in the presence of the dielectric layer. We show that the first structure has the highest sensitivity of angle minimum reflectivity, whereas the second one has the highest reflectivity sensitivity to the probed liquid refractive index changes.