A system identification model for ultrasonic characterization of a swollen PVA hydrogel

M. Lohakan, T. Jamnongkan, S. Kaewpirom, S. Boonsang
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引用次数: 0

Abstract

In this paper, the development of an ultrasonic characterization method for Poly-Vinyl Alcohol (PVA) hydrogel incorporating diffraction effects is purposed. The Lommel integral, diffraction correction procedure, is applied to the model. Nonlinear least square algorithm, iterative computation in forward model, is employed to minimize the error of the predicted parameters efficiently. To validate the model, the ultrasonic signal is measured in the reflection mode experiment. The system consists of PVA hydrogel as a testing sample immersed in water tank and 10 MHz unfocused piston transducer. Before the transducer is utilized to generate the ultrasonic beam, the alignment between sample and transducer must proceed to get the maximum spectrum of the ultrasonic incident beam. The properties of PVA hydrogel in the experimental results are shown in density, dispersion and thickness in micron scale. Finally, the purposed model has potential to estimate other parameters such as the scatterer size in future work.
膨胀聚乙烯醇水凝胶超声表征的系统识别模型
本文研究了一种结合衍射效应的聚乙烯醇(PVA)水凝胶超声表征方法。对该模型应用了Lommel积分和衍射校正程序。采用非线性最小二乘算法,即正演模型中的迭代计算,有效地减小了预测参数的误差。为了验证该模型,在反射模式实验中测量了超声信号。该系统由PVA水凝胶作为浸入水箱的测试样品和10mhz无聚焦活塞传感器组成。在利用换能器产生超声波光束之前,必须对样品与换能器进行对准,以获得超声波入射光束的最大光谱。实验结果表明,聚乙烯醇水凝胶在微米尺度上的密度、分散度和厚度均具有良好的性能。最后,在未来的工作中,该模型有可能估计其他参数,如散射体大小。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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