Transition from 1D to 2D laser-induced ultrasonic wave propagation in an extended plate

Laloš, Jernej (author), Požar, Tomaž (author), Možina, Janez (author)

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
• Typology: 1.01 - Original Scientific Article
• Organization: FS - Faculty of Mechanical Engineering
• Publication status: Published
• Publication version: Author Accepted Manuscript
• Year: 2016
• Number of pages: Str. 1-10
• Numbering: Vol. 37, iss. 5
• PID: 20.500.12556/RUL-105463
• UDC: 535(045)
• ISSN on article: 0195-928X
• DOI: 10.1007/s10765-016-2056-y
• COBISS.SI-ID: 14568475
• Publication date in RUL: 30.11.2018

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

Projects

• Funder: ARRS - Slovenian Research Agency
• Project number: P2-0392
• Name: Optodinamika