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Title: Moving photoacoustic sources: Acoustic waveforms in one, two, and three dimensions and application to trace gas detection

Abstract

The photoacoustic effect is governed by a wave equation with a source term proportional to the time derivative of the optical heat deposition per unit volume and time. Although the typical configuration for generation of the photoacoustic effect makes use of pulsed or amplitude modulated optical beams, the form of the source term in the wave equation indicates that a continuous optical source moving in an absorbing medium is capable of sound generation as well. Here, the properties of simple sources moving in one, two, and three space dimensions are reviewed. The salient feature of sources moving in one-dimension at sound speed is that the amplitude of the acoustic wave increases with time without bound according to linear acoustics. Finally, two schemes, one in the time-domain and the other in the frequency-domain, that take advantage of this principle for increasing the sensitivity of trace gas detection are reviewed.

Authors:
 [1]; ORCiD logo [1]
  1. Brown Univ., Providence, RI (United States)
Publication Date:
Research Org.:
Brown Univ., Providence, RI (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1610514
Grant/Contract Number:  
SC0001082
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 125; Journal Issue: 6; Journal ID: ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; physics

Citation Formats

Bai, Wenyu, and Diebold, Gerald J. Moving photoacoustic sources: Acoustic waveforms in one, two, and three dimensions and application to trace gas detection. United States: N. p., 2019. Web. doi:10.1063/1.5080267.
Bai, Wenyu, & Diebold, Gerald J. Moving photoacoustic sources: Acoustic waveforms in one, two, and three dimensions and application to trace gas detection. United States. doi:10.1063/1.5080267.
Bai, Wenyu, and Diebold, Gerald J. Wed . "Moving photoacoustic sources: Acoustic waveforms in one, two, and three dimensions and application to trace gas detection". United States. doi:10.1063/1.5080267. https://www.osti.gov/servlets/purl/1610514.
@article{osti_1610514,
title = {Moving photoacoustic sources: Acoustic waveforms in one, two, and three dimensions and application to trace gas detection},
author = {Bai, Wenyu and Diebold, Gerald J.},
abstractNote = {The photoacoustic effect is governed by a wave equation with a source term proportional to the time derivative of the optical heat deposition per unit volume and time. Although the typical configuration for generation of the photoacoustic effect makes use of pulsed or amplitude modulated optical beams, the form of the source term in the wave equation indicates that a continuous optical source moving in an absorbing medium is capable of sound generation as well. Here, the properties of simple sources moving in one, two, and three space dimensions are reviewed. The salient feature of sources moving in one-dimension at sound speed is that the amplitude of the acoustic wave increases with time without bound according to linear acoustics. Finally, two schemes, one in the time-domain and the other in the frequency-domain, that take advantage of this principle for increasing the sensitivity of trace gas detection are reviewed.},
doi = {10.1063/1.5080267},
journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 6,
volume = 125,
place = {United States},
year = {2019},
month = {2}
}

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