El-Busaidy Said Ali Said, Baumann Bernd, Wolff Marcus, Duggen Lars
Department of Mechanical Engineering and Production, Hamburg University of Applied Sciences, 20099, Hamburg, Germany.
Mads Clausen Institute, University of Southern Denmark, Sønderborg, 6400 Denmark.
Photoacoustics. 2020 Jan 10;18:100161. doi: 10.1016/j.pacs.2020.100161. eCollection 2020 Jun.
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.
光声光谱法采用声学谐振器进行信号放大。谐振器通常是封闭的，然而，在某些应用中，开放谐振器更受青睐。开口会使光声信号变差，从而降低光声测量的灵敏度。我们提出了两种使用有限元建模来模拟开放谐振器中光声信号的新方法。这些方法分别基于振幅模式展开模型和粘热模型，其中开口分别使用完全匹配层和边界元法进行建模。此外，使用完全匹配层的粘热模型在模拟开放谐振器方面的性能被扩展到超声区域。通过将模拟结果与光声测量结果进行比较来验证这些结果。这些方法为设计和优化高灵敏度的开放谐振器提供了准确的基础。
