Generation of high amplitude compressions and rarefactions in a photoacoustically excited droplet
Photoacoustic excitation of a fluid sphere generates an outgoing ultrasonic wave whose time profile permits determination of the density, sound speed, and diameter of the sphere. Experiments with pulsed laser beams have confirmed the major predictions of existing theory. With regard to acoustic wave...
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2021-09-01
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doaj-76fdb2148cd4417eb4ba4d31058952582021-07-31T04:39:42ZengElsevierPhotoacoustics2213-59792021-09-0123100289Generation of high amplitude compressions and rarefactions in a photoacoustically excited dropletXingchi Yan0Gerald J. Diebold1Department of Chemistry, Brown University, Providence, RI, 02912, USACorresponding author.; Department of Chemistry, Brown University, Providence, RI, 02912, USAPhotoacoustic excitation of a fluid sphere generates an outgoing ultrasonic wave whose time profile permits determination of the density, sound speed, and diameter of the sphere. Experiments with pulsed laser beams have confirmed the major predictions of existing theory. With regard to acoustic waves generated within spheres, although mathematical expressions for their properties are known, virtually no exploration of the waveforms in theory or experiment has taken place. Here, two cases for photoacoustic excitation of a droplet are discussed: first, absorption of radiation in a region of fluid external to the droplet, and, second, absorption of radiation by the droplet itself. Large amplitude transients, compressions in the former and rarefactions in the latter, are generated as the waves approach the center of the sphere. The high amplitudes of the waves suggest shock wave formation.http://www.sciencedirect.com/science/article/pii/S2213597921000495PhotoacousticOptoacousticLaserUltrasound |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Xingchi Yan Gerald J. Diebold |
spellingShingle |
Xingchi Yan Gerald J. Diebold Generation of high amplitude compressions and rarefactions in a photoacoustically excited droplet Photoacoustics Photoacoustic Optoacoustic Laser Ultrasound |
author_facet |
Xingchi Yan Gerald J. Diebold |
author_sort |
Xingchi Yan |
title |
Generation of high amplitude compressions and rarefactions in a photoacoustically excited droplet |
title_short |
Generation of high amplitude compressions and rarefactions in a photoacoustically excited droplet |
title_full |
Generation of high amplitude compressions and rarefactions in a photoacoustically excited droplet |
title_fullStr |
Generation of high amplitude compressions and rarefactions in a photoacoustically excited droplet |
title_full_unstemmed |
Generation of high amplitude compressions and rarefactions in a photoacoustically excited droplet |
title_sort |
generation of high amplitude compressions and rarefactions in a photoacoustically excited droplet |
publisher |
Elsevier |
series |
Photoacoustics |
issn |
2213-5979 |
publishDate |
2021-09-01 |
description |
Photoacoustic excitation of a fluid sphere generates an outgoing ultrasonic wave whose time profile permits determination of the density, sound speed, and diameter of the sphere. Experiments with pulsed laser beams have confirmed the major predictions of existing theory. With regard to acoustic waves generated within spheres, although mathematical expressions for their properties are known, virtually no exploration of the waveforms in theory or experiment has taken place. Here, two cases for photoacoustic excitation of a droplet are discussed: first, absorption of radiation in a region of fluid external to the droplet, and, second, absorption of radiation by the droplet itself. Large amplitude transients, compressions in the former and rarefactions in the latter, are generated as the waves approach the center of the sphere. The high amplitudes of the waves suggest shock wave formation. |
topic |
Photoacoustic Optoacoustic Laser Ultrasound |
url |
http://www.sciencedirect.com/science/article/pii/S2213597921000495 |
work_keys_str_mv |
AT xingchiyan generationofhighamplitudecompressionsandrarefactionsinaphotoacousticallyexciteddroplet AT geraldjdiebold generationofhighamplitudecompressionsandrarefactionsinaphotoacousticallyexciteddroplet |
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1721247039843467264 |