Geodesic
Diffraction on the cylindrical cavity of ultrasonic waves excited by pulse laser radiation
Vestnik Ûžno-Uralʹskogo gosudarstvennogo universiteta. Seriâ, Matematika, mehanika, fizika, Tome 12 (2020) no. 2, pp. 31-36 Cet article a éte moissonné depuis la source Math-Net.Ru

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The goal of the research is to create techniques and tools for detecting the discontinuities in metal with the help of the shadow and shadow-mirror methods of monitoring the ultrasonic flaw detection using the non-contact methods of ultrasonic wave generation and registration. To achieve this goal, studies on the diffraction of bulk elastic waves in a cylindrical cavity have been carried out on a special stand. A pulsed laser and a broadband EMA receiver are used to excite ultrasound and receive the diffracted waves. It is established that along with a decrease in the amplitude of the ultrasound pulses of longitudinal and shear waves transmitted through a discontinuity, a change in the pulse duration and frequency, which accounts for the maximum of their spectrum, can be used as the quantitative estimate of the defects.
Keywords: laser excitation of ultrasound, EMA receiver, volumetric defect, shadow method of laser-acoustic control, pulse spectrum of ultrasonic waves. 
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     title = {Diffraction on the cylindrical cavity of ultrasonic waves excited by pulse laser radiation},
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S. Yu. Gurevich; Yu. V. Petrov. Diffraction on the cylindrical cavity of ultrasonic waves excited by pulse laser radiation. Vestnik Ûžno-Uralʹskogo gosudarstvennogo universiteta. Seriâ, Matematika, mehanika, fizika, Tome 12 (2020) no. 2, pp. 31-36. http://geodesic.mathdoc.fr/item/VYURM_2020_12_2_a3/

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