Abstract
We have theoretically studied the time profiles of broadband pulses of shear acoustic waves obtained as a result of conversion of thermooptically excited longitudinal-wave pulses incident at various angles onto a plane-parallel isotropic solid plate immersed in a liquid. It has been shown that at a certain angle of incidence, the time profile of the shear-wave pulse in a plate repeats the profile of the incident longitudinal-wave pulse. To compare the theoretical and experimental results, we studied conversion of thermooptically excited longitudinal-wave pulses into shear-wave pulses and back in an aluminum and fused silica plane–parallel plate immersed in distilled water. The experimental time profiles of ultrasonic pulses coincide with theoretically calculated profiles except for an increased duration of the experimental pulses. Based on this double transformation scheme, we have proposed and experimentally realized the method of broadband acoustic spectroscopy of longitudinal and shear waves with a laser thermooptical source of ultrasound in the 1–40 MHz frequency range.
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Podymova, N.B., Karabutov, A.A. Conversion of Thermooptically Excited Broadband Pulses of Longitudinal Acoustic Waves into Pulses of Shear Waves in an Isotropic Solid Plate in a Liquid. Acoust. Phys. 67, 465–473 (2021). https://doi.org/10.1134/S1063771021040114
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DOI: https://doi.org/10.1134/S1063771021040114