Journal
OPTICS LETTERS
Volume 47, Issue 15, Pages 3736-3739Publisher
Optica Publishing Group
DOI: 10.1364/OL.461125
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Funding
- National Natural Science Foundation of China [61975080, 11774176]
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A novel method has been developed to detect closed cracks in transparent samples by opening the crack with laser ultrasonic shear waves and making the cracks visible in interferogram images. The width of the opened crack can also be quantitatively estimated.
The traditional optical detection method has a limitation in detecting closed cracks in optical elements. In this Letter, a novel, to the best of our knowledge, method has been developed for the detection of closed cracks in transparent samples. Firstly, behaviors of closed cracks under ultrasonic waves loading are demonstrated through the finite-element method (FEM). Simulation results show that the crack can be opened by the laser ultrasonic shear wave (S-wave). Then, a Mach-Zehnder interferometer system is experimentally established to detect closed cracks under ultrasonic waves loading in the sample. It is demonstrated that closed cracks which cannot be detected by interferometry become visible in interferogram images under ultrasonic waves loading. The width of the opened crack can also be quantitatively estimated. Thus the method would be a promising approach to detect initially closed cracks in optical elements. (C) 2022 Optica Publishing Group
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