Rajagopal, S;
Cox, BT;
(2021)
Modelling laser ultrasound waveforms: The effect of varying pulse duration and material properties.
The Journal of the Acoustical Society of America
, 149
(3)
pp. 2040-2054.
10.1121/10.0003558.
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Abstract
Optical generation of ultrasound using nanosecond duration laser pulses has generated great interest both in industrial and biomedical applications. The availability of portable laser devices using semiconductor technology and optical fibres, as well as numerous source material types based on nanocomposites, has proliferated the applications of laser ultrasound. The nanocomposites can be deposited on the tip of optical fibres as well as planar hard and soft backing materials using various fabrication techniques, making devices suitable for a variety of applications. The ability to choose the acoustic material properties and the laser pulse duration gives considerable control over the ultrasound output. Here, an analytical time-domain solution is derived for the acoustic pressure waveform generated by a planar optical ultrasound source consisting of an optically absorbing layer on a backing. It is shown that by varying the optical attenuation coefficient, the thickness of the absorbing layer, the acoustic properties of the materials, and the laser pulse duration, a wide variety of pulse shapes and trains can be generated. It is shown that a source with a reflecting backing can generate pulses with higher amplitude than a source with an acoustically-matched backing in the same circumstances when stress-confinement has not been satisfied.
| Type: | Article |
|---|---|
| Title: | Modelling laser ultrasound waveforms: The effect of varying pulse duration and material properties |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1121/10.0003558 |
| Publisher version: | https://doi.org/10.1121/10.0003558 |
| Language: | English |
| Additional information: | Copyright © 2021 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). |
| Keywords: | Optical fibers, Nanocomposites, Lasers, Materials, Acoustical properties, Radiometry, Signal processing, Acoustic phenomena, Speed of sound, Ultrasound |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Med Phys and Biomedical Eng |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10126098 |
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