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Transition from 1D to 2D laser-induced ultrasonic wave propagation in an extended plate
Laloš, Jernej (Author), Požar, Tomaž (Author), Možina, Janez (Author)

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Abstract
Optodynamic interaction between a laser pulse and the surface of an opaque, solid elastic object produces transient waves that propagate and reverberate within the object. They can be, in general, categorized into three distinctive types which are all formed through different mechanisms: ablation-induced waves, light-pressure-induced waves, and thermoelastic waves. In this paper, out-of-plane displacements of such waves are simulated at the epicentral position on the opposite side of an extended plane-parallel elastic plate. Wave propagation is mathematically described by Greenʼs transfer functions convolved with suitable time profiles of the incoming laser pulses. The simulated size of the circularly symmetric laser-illuminated area on the plate surface is varied to show the limit-to-limit transition of the displacement waveforms: from a 2D point source to an infinite 1D source.

Language:English
Keywords:ablation, elastic waves, laser-induced ultrasound, optodynamics, radiation pressure, thermoelasticity
Work type:Article (dk_c)
Tipology:1.01 - Original Scientific Article
Organization:FS - Faculty of Mechanical Engineering
Year:2016
Number of pages:str. 1-10
Numbering:Vol. 37, iss. 5
UDC:535(045)
ISSN on article:0195-928X
DOI:10.1007/s10765-016-2056-y Link is opened in a new window
COBISS.SI-ID:14568475 Link is opened in a new window
Views:381
Downloads:354
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Document is financed by a project

Funder:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije (ARRS)
Project no.:P2-0392
Name:Optodinamika

Secondary language

Language:Slovenian
Title:Prehod iz 1D v 2D lasersko induciranega širjenja ultrazvočnih valov v široki plošči
Abstract:
Optodinamska interakcija med laserskim bliskom in površino neprozornega trdnega elastičnega predmeta povzroči prehodne valove, ki se širijo in zvenijo znotraj predmeta. V splošnem se jih lahko razdeli na tri značilne vrste, ki se razlikujejo glede na mehanizem nastanka: ablacijsko inducirane valove, valove povzročene s svetlobnim tlakom in termoelastične valove. V tem članku so simulirani izvenravninski pomiki takih valov v epicentralnem položaju na nasprotni površini široke planparalelne elastične plošče. Širjenje valovanja se matematično opiše s konvolucijo Greenove prenosne funkcije z ustreznim časovnim potekom vpadlega laserskega bliska. Pri tem se simulirana velikost vpadnega območja krožno simetričnega laserskega bliska na površini plošče spreminja, s čimer je prikazan prehod valovnih oblik iz ene limite drugo: iz 2D točkastega vira v neskončen 1D vir.

Keywords:odvzemanje snovi, elastični valovi, lasersko povzročen ultrazvok, optodinamika, sevalni tlak, termoelastičnost

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