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Date of Publication:2005-01-01

Journal:光电子 激光

Issue:7

Page Number:779-782

ISSN No.:1005-0086

Abstract:A reliable and applicable semi-experience calculation model for structure crack remote measurement has been obtained by analyzing the experiment results of the relation between the optical loss in fiber and the crack width. With the calculation model the fiber optical remote sensing error is less than 0.02 mm compared with the directly measured crack width, and in some key monitored points the error could be even less than 0.01 mm. In the experiment an effect of optical loss saturation in the case of larger fiber-crack cross angles (θ�?5°) has been observed, which will has great applications in the practical engineering projects. To our knowledge, it is the first time that two wavelength optical source has been used for simultaneously monitoring the width and evolution tendency of cracks at a single position. At last, a direct 3 dimension scheme for constructing an embedded optical net-work in the potential split location has been proposed.

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