基于平底孔反射体的双晶直探头测量模型

双晶探头在无损检测领域有着重要的应用，因而有必要建立一个超声测量模型来深入了解这类换能器的特点.通过将一个基于传递矩阵的多高斯声束模型和一个基尔霍夫近似方法获得的散射模型有效结合，建立了一个完整的纵波双晶直探头测量模型，用于预测平底孔缺陷体的回波信号.对比分析了平底孔反射回波信号的模型计算结果与实验测量结果，验证了该测量模型的准确性. 关键词： 超声测量模型 双晶直探头 多高斯声束模型

An ultrasonic measurement model to predict the response from flat bottom hole for dual crystal contact probe

Dual crystal contact probes play an important role in many practical ultrasonic inspections, so it is essential to develop an ultrasonic measurement model in order to get a thorough understanding of the characteristics of this kind of transducers. By combining the multi-Gaussian beam model and the Kirchhoff approximation scattering model, a complete ultrasonic measurement model is provided to predict testing signals of a flat bottom hole for a dual crystal focused direct contact probe. By comparing with experimental results, the accuracy of predicted signals using this model has been verified.