基于超材料结构的宽频带高频光声信号定向传输模型设计

为了解决高频光声信号在传输过程中存在损耗严重等问题对光声成像技术应用的限制,本文在声学超材料结构上设计了一种用于实现宽频带高频光声信号定向传输的模型,通过COMSOL Multiphysics软件进行了模型建立,并进行了仿真测试。测试结果表明模型对200~1000 kHz的高频声波均有良好的定向传输效果,具备良好的宽频带定向低损耗传输特性,可以很好地解决高频声波传输过程中容易产生的声能损耗问题。以700 kHz的光声信号为例,研究了光声信号在模型中的传输特性。研究表明该模型在传输高频声波的过程中,能够达到很好的局域声场增强的效果,该模型可以满足光声成像技术在应用过程中的高频信号传输的需求。

Design of directional transmission model of wideband high-frequency photoacoustic signal based on metamaterial structure

In order to solve the limitation of the application of photoacoustic imaging technology due to the serious loss of high-frequency photoacoustic signal in the transmission process, a model for realizing the directional transmission of broadband high-frequency photoacoustic signal is designed on the acoustic metamaterial structure, and the model is established by COMSOL Multiphysics software, and the simulation test is carried out. The test results show that the model has good directional transmission effect for 200~1000 kHz high-frequency sound wave, has good broadband directional low loss transmission characteristics, and can well solve the problem of sound energy loss in the process of high-frequency sound wave transmission. Taking 700 kHz photoacoustic signal as an example, the transmission characteristics of photoacoustic signal in the model were studied. The research shows that the model can achieve good local sound field enhancement effect in the process of transmitting high-frequency sound waves, and the model can meet the needs of high-frequency signal transmission in the application of photoacoustic imaging technology.