Interferometric visualization of crack growth in glass plate
We present a potential tool to monitor growth of a crack in a glass plate using interferometry, where fringes characteristic of optical dislocations can be seen. It is experimentally observed that interference fringes can be used to visualize the stress field that is activated near the tip of a crack. In an interferometric setup, an optical wave-front is transmitted through the crack site of glass plate which results in a local phase jump in the test beam. This phase jump reveals itself in the fringe pattern in the form of fork fringes, where branching of fringes is seen at the crack tip and along the crack line. Using the Fourier transform fringe analysis method and phase-unwrapping method, we optically track the crack tip. The positions of fork fringes provide the location and trajectory of crack tip.
Publisher URL: https://link.springer.com/article/10.1007/s00340-019-7131-1
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