Tuning the characteristics of photoacoustic pressure in a laser-induced photoacoustic generator: a numerical study

Published

January 19, 2021

Author(s)

Sangmo Kang, Jeeseong C. Hwang

Abstract

We present a new numerical computation platform to simulate a laser-induced photoacoustic generator (LIPAG) model by integrating thermal, elastic, and acoustic multiphysics simulations. Our unique approach implemented a fully-explicit staggered-grid finite-difference method with perfectly matched layers to achieve high speed and high accuracy computation and to remove common artefacts in numerical simulations due to finite computation domains. The platform simulated the dynamics of photoacoustic (PA) pressure signals and local temperature fields in realistic LIPAG models to elucidate details of the underlying PA pressure generation mechanism. We also report on how the pressure wave characteristics are affected by the variation of the key parameters of the pulsed light and material properties. Our simulation technique capable of adjusting a wide range of parameters of the properties of the laser and materials in the model LIPAG would be instrumental to guide the design of LIPAGs to achieve desired PA pressure characteristics.

Citation

Applied Mathematical Modelling

Volume

94

Pub Type

Journals

Download Paper

https://doi.org/10.1016/j.apm.2020.12.029

Local Download

Keywords

Coupled acoustic and elastic wave equations, Coupled thermal-elastic-acoustic multiphysics simulations, Hyperbolic heat conduction equation, Perfectly matched layers, Photoacoustic ultrasound generator, Staggered-grid finite-difference method, Laser-induced photoacoustic generator

Citation

Kang, S. and Hwang, J. (2021), Tuning the characteristics of photoacoustic pressure in a laser-induced photoacoustic generator: a numerical study, Applied Mathematical Modelling, [online], https://doi.org/10.1016/j.apm.2020.12.029, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=929371 (Accessed April 24, 2024)