弹性介质形变对超声波传播特性影响的实验研究

弹性介质在受到外力的情况下会发生弹性形变。在弹性介质质量一定的情况下,此弹性形变会使弹性介质的体积和密度伴随着改变。对于超声波而言,在除了弹性介质本身的其他因素不变的情况下,弹性介质体积和密度的改变将会影响到超声波的传播特性。通过理论分析得出超声波幅值和相位随弹性琼脂应力变化的关系。以琼脂作为实验模型,检测琼脂在形变时超声波的信号参数,并且通过实验数据,最终得到二者的曲线和标定公式。此结果有利于今后在介质应力检测及超声波检测技术等方面的深入研究。

Experimental Study of the Influence of Elastic Medium Deformation on Ultrasonic Propagation Characteristics

Elastic medium subjected to external force action will present elastic deformation. Under the condition of keeping elastic medium mass unchanged, its volume and density will change due to the deformation. For the ultrasonic, in addition to the elastic medium itself, keeping all other factors unchanged, the change of medium volume and density will affect its propagation characteristics. The change of ultrasonic propagation characteristics includes its amplitude and phase. Through theoretical analysis, the variation relation between ultrasonic amplitude and phase and stress of elastic agar was obtained. Taking agar as experimental model, ultrasonic signal parameters in deformed agar were detected. Based on experimental data, curves describing signal parameters and ultrasonic characteristics were finally obtained and calibrated. Above results are propitious in deeper study of medium stress testing and ultrasonic detecting technology in the future.