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利用矩形压电晶片和有机玻璃楔块折射可激励出超声表面波,广泛用于固体近表面缺陷检测和材料特性测量.由于描述表面波三维声场的理论方法还鲜有报道,因而主要采用简化的表面波二维声场模型来定量分析这类问题.高斯声束模型近些年被广泛应用于解决超声体波传播的各种复杂问题,然而,目前还没有将其扩展应用到超声表面波的声场的计算中.通过结合表面波格林方程和矩形换能器的高斯声束模型,推导出基于高斯声束叠加的表面波三维声场解析解.进一步,将该方法与点源叠加的数值解进行了分析比较,计算结果表明表面波声场的高斯声束叠加方法在具有较好计算精度的同时,还具有更快的计算效率.
Ultrasonic surface waves are stimulated by the refraction of rectangular piezoelectric chips and plexiglass wedges, which are widely used in the detection of solid near-surface defects and measurement of material properties. Since the theoretical methods describing three-dimensional acoustic fields of surface waves have not been reported yet, Surface acoustic wave two-dimensional acoustic field model to quantitatively analyze such problems.Gaussian beam model has been widely used in recent years to solve the various problems of ultrasonic wave propagation complex, however, has not yet been extended to the acoustic surface acoustic wave The Gaussian beam model based on Gaussian beam superposition is derived by combining the Gaussian beam model with the surface wave and the rectangular transducer.Furthermore, The analysis and comparison show that the Gaussian beam superposition method of surface acoustic wave field has better calculation accuracy and faster computational efficiency.