1. Ice-enhanced thermoelastic excitation of ultrasonic waves.
- Author
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Kawabata, T., Hayashi, T., and Simonetti, F.
- Subjects
- *
LONGITUDINAL waves , *ATTENUATION of light , *LASER beams , *NONDESTRUCTIVE testing , *THERMAL expansion , *THERMOELASTICITY , *ECHO sounding - Abstract
The thermal expansion occurring when a laser beam is incident on the surface of a solid can be used to excite ultrasonic waves in the solid medium, without causing damage to the material. The resulting wavefield is characterized by a dominant shear wave and a weak compressional wave. This Letter demonstrates the possibility of generating a dominant compressional wavefield by coating the surface with a layer of clear ice. This is achieved by exploiting a minimum in the attenuation spectrum of light in ice, which occurs at around 500 nm and renders the coating transparent to green laser radiation. Ice coatings could, therefore, provide a path for the development of more sensitive laser-based nondestructive testing methods that have traditionally been affected by the poor excitability of compressional waves, especially along the direction orthogonal to the surface. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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