Modelling of open photoacoustic resonators

Photoacoustics

Marcus Wolff¹  Bernd Baumann²  Lars Duggen³  Said Ali Said El-Busaidy³ 

[1] Corresponding author at: Department of Mechanical Engineering and Production, Hamburg University of Applied Sciences, 20099, Hamburg, Germany.;Mads Clausen Institute, University of Southern Denmark, Sønderborg, 6400 Denmark;Department of Mechanical Engineering and Production, Hamburg University of Applied Sciences, 20099, Hamburg, Germany;

关键词: Open resonator;    Photoacoustics;    Finite element simulation;    Windowless resonator;   

DOI  :  

来源: DOAJ

【 摘 要 】

Photoacoustic spectroscopy employs acoustic resonators for signal amplification. Resonators are usually closed, however, in some applications, open resonators are preferred. The opening deteriorates the photoacoustic signal hence reducing the sensitivity of the photoacoustic measurement. We present two new approaches for simulating the photoacoustic signal in open resonators using finite element modelling. The approaches are based on the amplitude mode expansion model and the viscothermal model with the opening modelled using perfectly matched layers and the boundary element method respectively. Additionally, the performance of the viscothermal model using perfectly matched layers for simulating open resonators is extended to the ultrasound region. The simulation results are verified by comparing them to photoacoustic measurements. The approaches provide an accurate basis for designing and optimizing open resonators with high sensitivity.

【 授权许可】

Unknown