圆台形超声相控阵列在管材检测中的聚焦声场

针对一种新型的用于钢管横向缺陷检测的圆台形超声相控阵列,提出了计算管内一次波位移场的模型。设计了三维情况下,圆柱界面存在时的时间延迟法则,并在高频近似下,利用瑞利积分法结合稳相法,研究和计算了管材横截面以及纵剖面上的二维声场分布特性。最后详细讨论了圆台形相控阵列中心夹角、阵元宽度及动态阵元数等参数对管材中聚集声场的影响。结果表明,这种模型以及计算方法可以有效地分析圆台形阵列在钢管内的辐射位移场特性,为实际制作这种圆台形阵列提供理论指导。 

Focusing acoustic field of ultrasonic phased array on the inner surface of circular stage during flaw detecting in a pipe

A calculation method are presented, which can be used to compute displacement field of direct wave in a pipe emitted by a new ultrasonic phased array on the inner surface of a circular stage that is used to detect the circumferential flaws inside a pipe. According to Rayleigh integration and stationary phase method, the time delay law is designed and the theoretical research on refraction of displacement emitted by the new phased array in a pipe is conducted. At last, the effect on the radiated displacement distribution in the pipe with different parameters of the focusing phased array is discussed and analyzed. It is shown that the model and the calculation method can effectively research the character of radiated displacement field of this new phased array, and can be used to provide guidance for phase array design.