MICROCRACK EVALUATION USING LASER BACKSCATTERING

Y. Takaya, S. Takahashi, T. Miyoshi

Abstract

This paper describes the characteristics of the laser backscattering pattern of the microcrack on the ultra-fine finished surface of brittle material. The relation between the periodic backscattering pattern and the depth of the microcrack is made clear by employing the Boundary Element Method (BEM) simulations of electromagnetic wave scattering. The backscattering patterns are measured for the indentation microcracks with the depth of less than a hundred micrometer on the smooth glass surface. Experimental results show that the measured laser backscattering patterns agree with the simulation results and our method has a possibility to evaluate the depth of the microcrack quantitatively.

Keywords

laser back scattering, microcrack, ultra-fine finished surface

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IMEKO-WC-2000-TC2-P056.pdf

DOI

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IMEKO TC

TC2 - Photonics

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