Laser diagnostics of acoustic emission during formation of new phases in solids

T. S. Glebovich; A. Yu. Ivanov; V. I. Nedolugov; S. V. Vasilyev

doi:10.1117/12.579554

22 June 2004 Laser diagnostics of acoustic emission during formation of new phases in solids

T. S. Glebovich, A. Yu. Ivanov, V. I. Nedolugov, S. V. Vasilyev

Proceedings Volume 5503, Sixth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications; (2004) https://doi.org/10.1117/12.579554
Event: Sixth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, 2004, Ancona, Italy

Abstract

The acoustic emission of an ensemble of growing germs of a new phase in elastic medium, the scattering of hypersonic wave by an indicated ensemble and the transition processes initiated by an acoustic pulse were investigated. Two characteristic stages of germ formation-initial and late (stage of coalescention) were considered. The analysis of acoustic emission showed, that the ensemble of growing germs generates acoustic waves which frequencies ω_E are simple connected with the size R of heterogeneities (germs), and the intensity of each spectral component is determined by their concentration n(R). If we direct a laser beam on the sample, the radiation will be dispersed on the hypersonic waves, and the scattering angle will be simple connected the frequency of an acoustic wave and therefore with the sizes of a germ R.

Citation Download Citation

T. S. Glebovich, A. Yu. Ivanov, V. I. Nedolugov, and S. V. Vasilyev "Laser diagnostics of acoustic emission during formation of new phases in solids", Proc. SPIE 5503, Sixth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, (22 June 2004); https://doi.org/10.1117/12.579554

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KEYWORDS

Acoustics

Acoustic emission

Scattering

Diagnostics

Solids

Laser scattering

Spherical lenses

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